Answer: The species are poorly related to each other.
Darwin gave information for evolution as "descent with modifications" it involves a process in which species change and gives rise to a new species over generations. He proposed that the evolutionary history of life forms a branching tree with many level as a new species evolve. All species can be traced back to a common ancestor. Each newly evolved species will have one or more characteristics in common as that of the old species.
In species with no common ancestor will not have any similar characteristic in common such species cannot be evolutionary linked and cannot be placed and linked in an phylogenetic tree.
Give one example of a molecule using passive transport and one example of a molecule using active transport.
One example of passive transport is diffusion, when molecules move from an area of high concentration (large amount) to an area of low concentration (low amount). Molecules are said to naturally flow down their concentration gradient
Answer:
passive- glucose, salt or H2O.
active- proteins, poly nucleotides, or polysaccharides
Explanation:
Create a timeline of events related to the continental drift hypothesis. Your timeline should span the years from 1912 to the present, starting with the first evidence that inspired the continental drift hypothesis, and ending with the most recent discoveries and technologies of the theories of plate tectonics and seafloor spreading. Include at least 10 important dates that focus on scientific evidence supporting the theories, other scientists’ findings, technologies that promoted the process, scientific viewpoints that did not support the hypothesis, and other important information that led to our understanding of Earth’s moving plates.
The outlines of the continents flanking the Atlantic Ocean are so similar that their correspondence was apparent as soon as accurate maps became available. The earliest references to this similarity were made in 1596 by Flemish cartographer Abraham Ortelius and later in 1620 by the English philosopher Francis Bacon, in his book Novum Organum, and by French naturalist Georges-Louis Leclerc, count de Buffon, a century later. Toward the end of the 18th century, Alexander von Humboldt, a German naturalist, suggested that the lands bordering the Atlantic Ocean had once been joined.
The continental drift hypothesis was first proposed by Alfred Wegener in 1912 and it faced much resistance due to a lack of mechanism. It took decades and further progress in geology, oceanography, and geophysics to develop an understanding of the mechanism which is now known as plate tectonics. The advancement of technology like satellites has supported and confirmed the theory of plate tectonics.
Explanation:1912: Alfred Wegener first conceived of continental drift by examining a world map.1915: Wegener published his results in a book which showed evidence beyond the congruence in the shapes of the continents including similarities in fossils found only in South America and Africa.1930s - 1950s: Though Wegener's hypothesis was met with resistance due to lack of a mechanism to explain continental drift, a few scientists were impressed enough to continue searching for additional evidence.1960: Plate tectonics theory, a mechanism for the drifting of continents, is proposed and slowly gains acceptance among the scientific community.1962: The theory of seafloor spreading becomes a key supporting piece of evidence for plate tectonics.1980: The use of satellite technology provides precise measurements of the continents' movements, further confirming plate tectonics theory.1990s-Present: Continued advancements in technology and scientific understanding have made plate tectonics a cornerstone of geology. Learn more about Continental Drift Timeline here:https://brainly.com/question/38777817
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The pancreas produces enzymes that aid in digestion. By what process are these digestive enzymes excreted from pancreas cells? a. osmosis b. exocytosis c. endocytosis d. diffusion
The right option is; b. exocytosis
These digestive enzymes are excreted from pancreas cells by exocytosis.
Exocytosis is a form of active transport in which a cell exports molecules such as enzymes, and neurotransmitters out of the cell by using vesicular transport. Exocytosis is used by many cells because it allows the movement of large molecules through the cell membrane. Cells of the pancreas synthesize digestive enzymes that help in digestion through exocytosis.
Answer:
B. exocytosis is correct.
Explanation:
The plasma membranes is composed of a phospholipid bilayer with embedded proteins. What is one of the emendded proteins? Preventing do you phospholipid tails from binding together tails from binding together, protecting the cells from physical harm, allowing specific substance to flow into the cell, the finding the cell structure shape
The plasma membranes is composed of a phospholipid bilayer with embedded proteins. What is one of the emendded proteins? Preventing do you
(true or false) As discoveries were made that couldn't be explained by spontaneous generation, scientist came up with and updated version of the spontaneous generation model
The statement is false because, rather than updating the spontaneous generation model, scientists like Francesco Redi, John Needham, Lazzaro Spallanzani, and Louis Pasteur conducted experiments that led to its refutation and the subsequent acceptance of the biogenesis theory.
The statement is false. As discoveries were made that couldn't be explained by spontaneous generation, scientists did not come up with an updated version of the spontaneous generation model; instead, they began to disprove it with various experiments.
Francesco Redi's experiments in the 17th century were among the first to refute spontaneous generation by demonstrating that maggots on meat only developed from flies' eggs, indicating that life comes from life. John Needham initially supported spontaneous generation with his experiments, but Lazzaro Spallanzani countered Needham's findings by showing that air itself was not responsible for microbial life. Finally, Louis Pasteur definitively disproved spontaneous generation with his swan-neck flask experiment, which indicated that microbes in the air were responsible for contaminating broths and not a 'life force' inherent to the broth itself. This led to the acceptance of the theory of biogenesis, which states that life comes only from pre-existing life.
The theory of biogenesis is the correct understanding that we adhere to today. It replaced the myth of spontaneous generation, with Pasteur's work being fundamental to this scientific paradigm shift.
Which of these are the correct sequence of events at a crime scene?
A) Secure the scene, search for evidence, collect evidence, send evidence to laboratory for testing, take photographs, take notes.
B) Secure the scene, search for evidence, take notes, collect evidence, send evidence to laboratory for testing, take photographs.
C) Secure the scene, take photographs, take notes, search for evidence, collect evidence, send evidence to the laboratory for testing. <---- my answer
D) Secure the scene, take photographs, send evidence to the laboratory for testing, take notes, search for evidence, collect evidence.
You are correct... Its C)Secure the scene, take photographs, take notes, search for evidence, collect evidence, send evidence to the laboratory for testing.
Hope this helps...
BTW you are smart....
The statement that represents the correct sequence of events at a crime scene is as follows:
Secure the scene, take photographs, take notes, search for evidence, collect evidence, and send evidence to the laboratory for testing.Thus, the correct option for this question is C.
What is a Crime scene?A crime scene may be defined as any physical scene, anywhere, that may significantly provide potential evidence to investigators in order to deliver an exact sense of understanding to them.
According to the context of this question, when a crime is committed in any place, an investigator must first try to secure the place where the crime is committed followed by capturing photographs of the same location from multiple angles.
After capturing photographs, investigators need to take note of that and search to collect the evidence at the point of an incident. Finally, they need to send all the collected evidence to the laboratory for focused testing.
Therefore, the correct option for this question is C.
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An ecological hot spot is an area where
A) many habitats and species are at high risk of extinction.
B) species diversity is too high.
C) hunting is encouraged.
D) habitats and species show a high amount of biodiversity.
Answer:
An ecological hot spot is an area where many habitats and species are at high risk of extinction.
Answer:
The Correct answer is A
Many habitats and species are at high risk of extinction.
Explanation:
An ecological hot spot is an area where
Habitats and species are healthy.An ecological hot spot is an area that is outstanding with biological diversities or high biological values.These values can be benefited to those species which is about to get extinct soonThe Concept of the ecological hot spot is based is on the approach to conserve the Biodiversity.
How are populations of blue winged warblers most likely to be affected by the earlier arrival of spring
Answer:
Because of the early coming of springs, the warblers would not get the best places for nesting. With this, the early-spring food sources also get declined by the time they reach the breeding grounds. Subsequently, the survival and the rates of reproduction of the warblers would also get diminished. Eventually, the population size of the warblers would see a decline.
You are the first responder on a crime scene. You arrive and find yourself in an odd room— empty of everything except the body of an old man who has been decapitated; his head is nowhere to be found. You can clearly tell the no one else is around and the body looks like it has been here for days. What would be one of the first things you would document after arriving on the scene? The age and overall appearance of the body Whether the doors and windows in the room were open or closed The estimated time of death of the victim The presence of a murder weapon
Answer:
Whether the doors and windows in the room were open or closed.
Explanation:
The purpose of crime scene documentation is to create a visual record that enables the forensic laboratory and prosecutor to recreate an accurate view of the location. For this reason, the first step of the documentation is to provide an overview of where the crime occurred.
The overview documentation is the widest overview of the whole site. If the crime scene is indoors, this includes:
view of all rooms (not only the room where the crime occurred), with photographs taken from each corner and, if there is a crane in place, from a higher vantage point. These photographs include observation whether the doors and windows of the rooms and the house are open or closed; aerial shots outside the building where the crime took place, including photos of all entrances and exits; view of the building showing its relation to adjacent buildings; photos of any viewers in the scene.The volume of a right circular cylinder can be approximated as follows: Volume = ?r2h; where r is the radius of the cylinder and h is the height of the cylinder; ? is a constant that is roughly equal to 3. Using the simple approximation above, calculate the volume of a right circular cylinder with a radius of 2 meters and a height of 9 meters.
The volume of a right cylinder is the area of the base times the height of the cylinder.
If ? = 3, r = 2m, h = 9m
The equation is ?r2h, then:
3 * [tex]2^{2}[/tex] m * 9m = 108 m3
The volume of the required right circular cylinder is 108 [tex]m^{3}[/tex]
What is a right circular cylinder?"It is a cylinder with circular bases and an axis connecting the two bases' centers that is perpendicular to the bases' planes."
How to calculate the volume of it?According to the question:
Volume = [tex]xr^2h[/tex];Where x = 3.Given:
the radius is 2 meters the height of 9 metersTherefore the volume of the right circular cylinder is
= [tex]3*(2^2)*9 = 108 m^3[/tex]To learn more about volume, right circular cylinder, and perpendicular here,
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A team of biology students performed an experiment to test the effects of four different solutions on a de-shelled, raw chicken egg. Each raw, unbroken chicken egg of the same size was placed in each of four different solutions. Twenty-four hours later the following results were obtained. What is the dependent variable in this experiment?
A. Solution A, B & C.
B. Solution D only
C. The eggs
D. Mass
B. Solution D only
Solution D is the dependent variable in this experiment.
The variable being measured or tested in an experiment is known as the dependent variable.
What makes up the experiment's independent variable?
The experimenter adjusts or manipulates the independent variable, which is thought to have an immediate impact on the dependent variable.
Let's use "Test Scores" as an example. You're interested in how studying or sleeping affects test results. The dependent variable in the case is "test score." The independent variable is "studying" or "sleeping" because these variables affect how well a student performs on the test.
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The dependent variable in the experiment with de-shelled eggs in different solutions is the mass of the eggs after 24 hours. It is what was measured to determine the effects of the solutions.
The dependent variable in the experiment with the de-shelled, raw chicken eggs placed in different solutions is D. Mass of the eggs after being in the solutions for 24 hours. This is the outcome that the biology students would have measured to determine the effect of each solution. The dependent variable changes in response to the independent variable, which in this case are the four different solutions (A, B, C, and D).
In experiments, the independent variable is the one that is changed or controlled in order to see its effects on the dependent variable. The dependent variable is what is being measured or tested. For example, when a scientist grew bacteria on two types of gels to compare growth rates, the type of gel used is the independent variable, and the growth of the bacteria (number of bacteria present after 24 hours) is the dependent variable.
The pairing of chromosomes and the exchange of DNA between chromosomes is called crossing over, the diagram below illustrates this concept. Crossing over is a completely random process. What effect will crossing over have on the new cells produced after meiosis?
The right answer is B (in the most of the cases).
The crossing-over (equilibrium) corresponds to an intercrossing of homologous chromosomes that, during meiosis I, exchange certain chromatid fragments after pairing, leading to a mixture of the genes they carry.
Cross-over occurs only in heterozygous individuals (with linked genes, that is, two genes on the same pair of homologous chromosomes). The heterozygous individual, after crossing-over, will produce parental gametes and recombinant gametes.
In homozygous individuals, the crossing-over has no influence on the combination of the alleles, since they are identical.
Researchers have historically considered the human appendix to be a vestigial structure. What evidence, if true, would best disprove this claim?
The idea that the human appendix is a vestigial structure could be disproved by evidence of its having a functional role in the body. This could include its involvement in immune responses or as a bacterial reservoir during diarrheal disease.
Explanation:The human appendix has historically been perceived as a vestigial structure, meaning it's deemed as having lost its original function through evolution. Vestigial structures often serve as evidence for common ancestry or convergent evolution, suggesting a common origin of life or the impact of similar environmental conditions on different organisms.
However, to disprove the idea that the appendix is vestigial, evidence showing that the appendix serves a legitimate function would be necessary. Recent research suggests that it may not be vestigial, as it contains lymphoid tissue and could serve immunologic functions.
For example, the appendix may serve as a bacterial reservoir during diarrheal illness, helping to repopulate the enteric bacteria in the gut to help survive. In this context, the appendix potentially provides a survival advantage. Moreover, the complex anatomy of the appendix may also contribute to the accumulation and multiplication of intestinal bacteria.
Thus, the best evidence to disprove the claim of the appendix being a vestigial structure would be empirical findings that validate its function in the human body, such as its potential role in immune responses or intestinal health.
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Which of these instruments is BEST used for observing a single-celled organism like the one seen here? A) hand lens B) watch glass C) light microscope D) electron microscope
Answer:
light microscope - trust me
Explanation:
Final answer:
The best tool to observe a single-celled organism is a light microscope, which uses visible light to magnify live cells, and when used with stains, can reveal more cellular details.
Explanation:
In the context of viewing a single-celled organism, the light microscope would be the best tool to use (Option C). Light microscopes use visible light and lenses to magnify objects, making it ideal for observing living organisms and basic cellular structures, particularly when cells have been stained to reveal more details. Although electron microscopes, like the scanning or transmission electron microscopes, provide higher magnification, they are not suitable for live specimens and are typically used to view very small surface structures or thick structures at very high resolutions.
Using stains is a common method scientists use to increase the contrast of cells under a light microscope, which helps to distinguish the fine details of the structures inside the cells. However, it is important to note that this process usually kills the cells, so live observations would not be possible with stained specimens.
Identify the structures of skeletal muscle.
Though the skeletal muscle cells are of different sizes and shapes, the main components of a skeletal muscle cell remain the same. The skeletal muscle is enveloped by a layer of connective tissue called epimysium, it protects the muscles from friction against the bones and other muscles.
The skeletal muscles are also covered by a fibrous connective tissue called endomysium that insulates each muscle fiber. Underneath the endomysium is the sarcolemma that is the cell membrane of the fibers and underneath that is the sarcoplasm that is the cytoplasm of the cell.
Each muscle fiber also comprises cylindrical organelles called myofibrils. Each muscle fiber comprises hundreds to thousands of myofibrils. The myofibrils are the bundles of myosin and actin proteins that go through the length of the muscle fiber and plays an essential role in the contraction of muscles.
The myofibrils are surrounded by a network of tubules and channels known as the sarcoplasmic reticulum, which is stored with calcium and is essential for the contraction of muscles. Each myofibril can be further dissociated into functional repeating segments known as sarcomeres.
The surface area of a sphere can be approximated as follows: Surface area = 4πr2; where r is the radius of the sphere; π is a constant that is roughly equal to 3.Using the simple approximation above, calculate the surface area of a sphere with a radius of 2 meters. A 16 m2 B 9 m2 C24 m2 D 48 m2
D.) 48m^2
Hope this helps!
Answer:
D. 48 [tex]m^2[/tex]
Explanation:
Since surface area = [tex]4\pi r^2[/tex] and r = 2 while [tex]\pi[/tex] = 3, the problem can be solved by simple substitution. Substitute for r and [tex]\pi[/tex] in the equation
Surface area = 4 x 3 x 2 x 2
= 48 [tex]m^2[/tex]
The surface area of a sphere with a radius of 2 meters is 48 [tex]m^2[/tex].
The correct option is D.
Please take your time to see the picture and answer. (40 Points) ~Biology~
In YOUR OWN WORDS, describe the functions of two of the membranes shown in the art of the amniotic egg.
The amnion, allantois, yolk sac, and chorion are fluid-filled membranes that allow the embryo to survive inside the egg. The amnion, which is filled with amniotic fluid and provides the embryo with a stable fluid environment, surrounds and protects the embryo.
What is an amniotic egg?
A water-retaining shelled egg with four membranes that allows reptiles, birds, and egg-laying mammals to complete their life cycles.
There are membranes present, namely:
Extra-embryonic membranes: these are the membranes present in amniotic eggs that are not a part of the body of the developing embryo.Inner amniotic membrane: it usually surrounds the embryo.The chorion: it surrounds the embryo as well as yolk sac and aids in the exchange of gases.The amnion: it helps to protect the embryo from mechanical shock as well as supports hydration.The allantois: it usually stores nitrogenous wastes generated by the embryo as well as also facilitates respiration.Thus, these are some membrane that is integral part of the amniotic egg.
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Proteins from outside a cell that stimulate it to divide are called A. oncogenes. B. stem cells. C. cyclins. D. growth factors
That would be, D. Growth factors
Proteins from outside a cell that stimulates it to divide are called growth factors (option D).
Growth factors are specific proteins capable of stimulating the cell cycle by activating signaling pathways.Growth factors can also act as transcription factors to promote gene transcription.Growth factors are fundamental during the interphase of the cell cycle.In conclusion, proteins from outside a cell that stimulates it to divide are called growth factors (option D).
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What scientist concluded that all cell come from preexisting cells
Answer:
Rudolf Virchow
Explanation:
mount saint helens erupted several times between may and august 1980 what lesson did the eruptions teach scientists
The eruption of Mount St. Helens provided a prospect for the scientists to examine the effects of the catastrophe. In the eruption, the losses were tragic, however, after the incident, the geologists hugely bettered their tendency to determine eruptions, by safely evacuating thousands of Filipino people prior to the eruption of Pinatubo in 1991.
Scientists also started to learn various other valuable lessons, even some of them have defied the fundamentals of evolutionary thinking. The eruption of 1980, offered a natural laboratory for comprehending that how quickly the catastrophic procedures can reshape the globe, and how briskly wildlife can recover.
A population of hummingbirds feeds exclusively on nectar from orchids. Two species of orchids exist in the hummingbirds' habitat. One orchid species has long tubes to store nectar while the other has short tubes to store nectar. The hummingbirds have a range of beak lengths, and the beak length determines which nectar tube an individual can feed from. This population of hummingbirds is splitting into two phenotypic groups.
What scenario best explains why the population is diverging?
A. Hummingbirds with intermediate beak lengths can feed from both species of orchid, but the individuals with the shortest and longest beaks can each only feed from one species.
B. Hummingbirds with short beaks only mate with individuals who have long beaks, ignoring individuals with intermediate and short beaks.
C. Hummingbirds with the longest beaks are better adapted to the environment compared to hummingbirds with short and intermediate length beaks.
D. Hummingbirds with shorter or longer beaks can feed from one of the available orchids, but hummingbirds with intermediate beak lengths cannot feed from either.
Most likely, the correct answer is:
D. Hummingbirds with shorter or longer beaks can feed from one of the available orchids, but hummingbirds with intermediate beak lengths cannot feed from either.
The length of a hummingbird's beak vary depending on its food, but it is usually longer than hummingbirds' bodies. The length is useful for reaching deep into blossoms to lap up nectar.
Answer: D.
Natural selection is the differential survival and reproduction of individuals because of the differences in the phenotypic characteristics. It supports the fact that those organisms, which have phenotypic characteristic favorable to survive in the changing environment as compared to other organisms, and these traits will also be passed to the successive generations.
In the given situation, the hummingbirds those have adapted according to the needs, that is deriving nectar from either from short and long tubes nectar. Therefore, two phenotypic characteristics like short beak and long beaks will become dominant trait in the population of humingbirds as the intermediate beak hummingbirds will not be able to feed from either of the flowers.
Therefore, option D. Hummingbirds with shorter or longer beaks can feed from one of the available orchids, but hummingbirds with intermediate beak lengths cannot feed from either is correct.
True or False Questions
1) Trans-Neptunian objects orbit Neptune
2) Since it was reclassified as a dwarf planet, Pluto is no longer considered a planet.
3) Solar wind moves in the Opposite direction of the sun's gravity.
4) Objects in the Kuiper Belt are as old as the solar system itself.
5) The place where Solar wind collides with interstellar winds is called the Oort Cloud.
Trans-Neptunian objects are beyond Neptune's orbit, not around it, making the first statement False. Pluto's reclassification as a dwarf planet means the second statement is True. Solar wind moves opposite to the sun's gravitational pull, so the third is True. Kuiper Belt objects are indeed as old as the solar system (#4 True), and the heliopause is the region where solar and interstellar winds meet, not the Oort Cloud (#5 False).
Trans-Neptunian objects orbit Neptune: False. Trans-Neptunian objects (TNOs) are located in a region of space beyond the orbit of Neptune, not around Neptune itself.Since it was reclassified as a dwarf planet, Pluto is no longer considered a planet: True. Pluto is now classified as a dwarf planet because it does not meet all the criteria to be considered a major planet, specifically it has not cleared its orbit of other debris.Solar wind moves in the Opposite direction of the sun's gravity: True. Solar wind consists of charged particles emitted by the sun that move outward throughout the solar system, opposite to the gravitational pull of the sun.Objects in the Kuiper Belt are as old as the solar system itself: True. The objects in the Kuiper Belt are ancient, as they formed around the same time as the rest of the solar system.The place where Solar wind collides with interstellar winds is called the Oort Cloud: False. The region where solar wind collides with the interstellar medium is known as the heliopause, not the Oort Cloud.The student correctly associates macrocytic and enlarged red blood cells with which type of anemia
Macrocytic and enlarged red blood cells are characteristic for macrocytic anemia.
Macrocytic anemia is a blood disorder which occurs when the body produce large red blood cells and not enough normal red blood cells. Macrocytic anemia is most often caused by a lack of vitamin B-12 and folate with the symptoms like loss of appetite or weight, pale skin (including lips and eyelids), brittle nails, diarrhea, fatigue…
The student correctly associates macrocytic and enlarged red blood cells with a type of anemia called a megaloblastic anemia. In this type of anemia, red blood cells (RBC’s) are not produced properly so the cells are very large. They are not able to withdrawal the bone marrow to come into the bloodstream and carry or transfer the oxygen.
23 POINTS, NEED ASAP
According to the phylogenetic tree, which two phyla are most closely related?
A. Chordata and Mollusca
B. Cnidaria and Nematoda
C. Annelida and Arthropoda
D. Platyhelminthes and Echinodermata
The most related phyla according to phylogenic tree are:
• Chordata and Echinodermata
• Arthropoda and Nematoda
• Mollusca and Annelida.
A phylogenetic tree is a diagram that shows the evolutionary relationships among various biological. It is based upon similarities and differences in their physical or genetic characteristics.
Option C is correct.
C. Annelida and Arthropoda
Explanation:Annelida and Arthropoda are the phyla belong to the kingdom Animalia. In these both phylum animals are consist of segmented bodies. But the animals in Annelida consists of a hydrostatic skeleton whereas the animals in Arthropoda consist of exoskeleton made up of chitin.
Which federal agency helps foreign governments with international conservation efforts?
A) US Forest Service
B) US Fish and Wildlife Service
C) Bureau of Land Management
D) National Park Service
Hi,
I recommend B.US Fish and Wildlife Service
Why?
Among the responsibilities of the FWS are enforcing federal wildlife laws, protecting endangered species, managing migratory birds, restoring nationally significant fisheries, conserving and restoring wildlife habitat (such as wetlands), helping foreign governments with their international conservation efforts.
❣Please give a thanks and a brainliest.Answer:
B.US Fish and Wildlife Service
Explanation:
Examine the analogy comparing an element to a brick.
element : compound :: brick : _[blank]_
Choose the answer that best completes this analogy.
1.boat 2. wood 3.house 4. cement
Answer: House
Explanation:
The analogy of element is compound. This means that the elements constitute together to form a compound.
So, the analogy to brick will be house. Bricks are joined together to form a house. This is as same as element which are smaller compounds that is joined together to form compound.
So, the correct answer would be house.
This statement shows that living organism depend on.
What roles do protists play in the environment?
The slime molds are important to ecosystems because they are decomposers, which release vital nutrients back into the environment. You could say life on Earth depends on the protists because they supply us with oxygen, are critical organisms in food chains, and recycle important nutrients for other life forms to use.
Protists have vital roles in the environment as primary producers, food sources, and decomposers. They contribute to oxygen production, the food chain, and nutrient cycling, but some can also be pathogenic, affecting humans, animals, and plants. Additionally, protists have significant applications in industry and medical research.
Explanation:Roles of Protists in the Environment
Protists play critically important ecological roles in various environments. As primary producers, particularly in the world's oceans, protists like phytoplankton contribute significantly to oxygen production through photosynthesis. These plant-like protists are the foundation of many aquatic food webs, supporting a diverse range of life forms. In addition to their role as producers, they serve as food sources for other organisms, both directly and indirectly. For instance, planktonic protists are primary consumers for many marine species.
On the other end of the ecological spectrum, protists act as decomposers, breaking down dead organic matter and recycling essential nutrients back into the ecosystem. This decomposition process is crucial for the nutrient cycles that sustain terrestrial and aquatic environments.
Some protists are known to be pathogenic and can cause diseases in humans, animals, and plants. Examples include the malaria-causing Plasmodium and the phytophthora that causes devastating plant diseases like potato blight.
Furthermore, protists contribute to human industries and scientific research. For instance, carrageenan, extracted from red algae, is widely used in the food industry. Protists are also employed in medical research for developing treatments for various health ailments.
List the key differences between Eukaryotic Gene Expression and Prokaryotic Gene Expression using the information provided in the lesson so far. In the chart below, list the characteristics of gene expression that is unique to that cell type. Microsoft Word - EukaryoticVsProkaryoticGeneExpression
To understand how gene expression is regulated, we must first understand how a gene becomes a functional protein in a cell. The process occurs in both prokaryotic and eukaryotic cells, just in slightly different fashions.
Because prokaryotic organisms lack a cell nucleus, the processes of transcription and translation occur almost simultaneously. When the protein is no longer needed, transcription stops. As a result, the primary method to control what type and how much protein is expressed in a prokaryotic cell is through the regulation of DNA transcription into RNA. All the subsequent steps happen automatically. When more protein is required, more transcription occurs. Therefore, in prokaryotic cells, the control of gene expression is almost entirely at the transcriptional level.
Eukaryotic cells, in contrast, have intracellular organelles and are much more complex. Recall that in eukaryotic cells, the DNA is contained inside the cell’s nucleus and it is transcribed into mRNA there. The newly synthesized mRNA is then transported out of the nucleus into the cytoplasm, where ribosomes translate the mRNA into protein. The processes of transcription and translation are physically separated by the nuclear membrane; transcription occurs only within the nucleus, and translation only occurs outside the nucleus in the cytoplasm. The regulation of gene expression can occur at all stages of the process
Answer:
Explanation:
Prokaryotic gene expression (both transcription and translation) occurs within the cytoplasm of a cell due to the lack of a defined nucleus; thus, the DNA is freely located within the cytoplasm. Eukaryotic gene expression occurs in both the nucleus (transcription) and cytoplasm (translation).
Daphnia is a small water invertebrate that is almost transparent. Like all animals, Daphnia require chemical energy to live. It uses structures called gills to extract oxygen from the water to help it obtain chemical energy. Which statement below describes how they obtain chemical energy?
Daphnia obtains chemical energy by extracting dissolved oxygen from water using its gills, much like fish and other aquatic organisms. These gills allow for the rapid diffusion of oxygen into the bloodstream, which is essential for metabolic activities.
Explanation:Daphnia, a small water invertebrate, obtains chemical energy by using its gills to extract oxygen from water, a process similar to how fish and many aquatic organisms survive. Gills in aquatic organisms are thin tissue filaments that are highly branched and folded. When water passes over these gills, the dissolved oxygen in the water rapidly diffuses across the gills into the bloodstream (or coelomic fluid in some cases). This oxygenated blood is then circulated to other parts of the organism, aiding in the release of chemical energy through the process of respiration. This is essential for Daphnia's survival and the execution of its metabolic activities.
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Daphnia obtain chemical energy by using their gills to extract dissolved oxygen from the water. This oxygen diffuses into their bloodstream where it is used for metabolic activities. This process allows them to live in environments with lower oxygen concentrations such as that found in water.
Explanation:Daphnia, like many other aquatic organisms, obtain chemical energy through a process involving its gills and the water it lives in. The gills of Daphnia are thin tissue filaments that are highly branched and folded. When water passes over these gills, the dissolved oxygen in the water rapidly diffuses across the gills into the bloodstream.
Once in the bloodstream, the circulatory system can then carry the oxygenated blood to other parts of the Daphnia's body, providing the chemical energy necessary for metabolic activities. This process, similar to how fish extract oxygen from water, allows Daphnia to efficiently use the limited amount of oxygen that is available in water, which is considerably lower than the concentration found in the atmosphere.
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