Answer:
Selective permeability. When many glucose molecules combine they form one large molecule called starch. Due to starch being a larch molecules they have difficulty passing through the membrane. Glucose molecules are smaller in size therefore they can pass easily through the membrane.
Explanation:
Selective permeability the the process whereby the cell membrane allows for selective molecules to pass through its membrane, in order to obtain internal equilibrium.
Two pea plants with yellow peas are crossed. Most of their offspring have yellow peas, but about 25 percent of the offspring have green peas. For pea color, yellow is the dominant trait and green is the recessive trait. What does this tell you about the two parent plants?
Answer:
Two pea plants are crossed, both are with yellow color, offspring produced are 25% with green peas, while remaining 75% are with yellow peas. It clearly describes that yellow pea color is dominant while green is recessive one.
According to the given data, the ratio of both pea colors is 3:1 of yellow to green color. According to Mendel's law of inheritance, it is only possible when both the parents are heterozygous for the pea genotype. Let the genotype for yellow color be 'Y' and that for green color is 'y'. So, the genotype of both parents would be "Yy", they will fuse to form offspring having 25% green and 75% yellow phenotype of pea color.
Final answer:
Both parent plants must have been heterozygous (Yy) for pea color, resulting in 75% of offspring with yellow peas and 25% with green peas, as predicted by a Punnett square analysis and aligning with Mendelian inheritance.
Explanation:
When two pea plants with yellow peas are crossed and about 25 percent of the offspring have green peas, we can deduce that both parent plants were heterozygous for pea color (Yy). The observed trait of pea color, where yellow is dominant and green is recessive, aligns with Mendelian inheritance patterns as discovered by Gregor Mendel. To understand this, we can use a Punnett square analysis to predict the genotypes of their offspring.
In a Punnett square crossing two heterozygous (Yy) parents, we expect the following genotype percentages in the F2 generation:
YY (25% - yellow peas)Yy (50% - yellow peas)yy (25% - green peas)Given that the yellow trait is dominant, 75% of the offspring will show yellow peas, while 25% will show the recessive green peas, confirming that both parents must have the genotype Yy.
What did astronomer Edwin Hubble discover in 1929?
I need it up to 4 sentences
Answer:
Edwin Hubble discovered that the universe was expanding. he used his known 100 inch telescope to discover that our milky way was one of many galaxies. that these galaxies are part of an ever expanding universe. This discovery changed the way we and scientists look at the universe
Edwin Hubble discovered that the universe is expanding, providing critical evidence for the Big Bang theory and altering cosmological understanding.
In 1929, astronomer Edwin Hubble made a groundbreaking discovery that reshaped our understanding of the cosmos.
Using the Mount Wilson Observatory, he observed distant galaxies and found that their light was shifted towards the red end of the spectrum, indicating they were moving away from us.
This revelation led to the formulation of Hubble's Law, showing a proportional relationship between a galaxy's distance and its velocity of recession.
The implications were profound, suggesting the universe was expanding. This provided pivotal evidence for the Big Bang theory, challenging the prevailing notion of a static and unchanging universe.
Hubble's discovery fundamentally altered cosmology, setting the stage for our modern understanding of the vast and dynamic universe we inhabit.
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Which of the following is an example of a natural source of air pollution?
A. Burning coal and natural gas releases carbon dioxide.
B. Plowing and harvesting crops releases dust particles.
C. Blowing wind creates dust storms that release particles.
D. Mining releases gases trapped beneath Earth's surface.
Answer: C - Blowing wind creates dust storms that release particles.
Explanation:
just took it
Natural pollution can be caused by different sources. Option C. Blowing wind creates dust storms that release particles.
What are the natural sources of pollution?When talking about natural sources of pollution, we refer to the emission of polluting elements from natural organims biotic or abiotic elements in which human activities are not involved.
Natural pollution is usually less harmful than human activity pollution. This pollution is released, among others, by volcanoes, oceans, plants, anaerobic and aerobic activities. Particularly, emissions from plants and microbial activities that produce biogenic emissions might be related to natural pollution.
Among others, we can mention,
volcanic eruptionsdust moved by windsgasses emitted from fecessea salt sprayvolatile organic compound emissions from plants.According to this information, the correct option is C. Blowing wind creates dust storms that release particles.
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The enzyme DNA polymerase works only in the 5′ to 3′ direction. How does this affect the leading strand and the lagging strand?
A. DNA polymerase can work on both the leading and the lagging strand but is much faster on the leading strand.
B. DNA polymerase can use only the leading strand as a template. A different enzyme is used to synthesize DNA on the lagging strand.
C. DNA polymerase can work continuously on the leading strand but works discontinuously on the lagging strand, creating Okazaki fragments.
D. DNA polymerase can work continuously on the leading strand but must flip the lagging strand around before it can work on it.
Answer:
The correct answer is option C.
Explanation:
DNA polymerase is an enzyme of replication which adds nucleotides to the new or nascent DNA strand using energy in the form of ATP.
The type III of this enzyme binds new nucleotides in 5′ to 3′ direction after reading the bases of existing strand and adding complementary base pairs at 3’-OH group of the primer.
The new strand moving in the direction of 5' to 3' is synthesized continuously called leading strand as DNA polymerase moves in the same direction of replication fork but the strand running opposite to replication fork is made in fragments called Okazaki fragments called lagging strand.
Thus, option C is the correct answer.
A geology student finds a rock formation composed of sedimentary rock. Based on the principle of _______, the student concludes that the layers on the bottom are older than the layers on the top.
ANSWER:
Based on the "principle of Superposition", the geology student can say that the layers on top are "younger" than the layers present below.
EXPLANATION:
The principle of superposition is a basic principle in geology which states that in a "sequence of strata", any stratum is "younger" than the one on which it "rests". Sedimentary rocks are formed by deposition of "one layer on top of another". Therefore, the "layers at the bottom will be older" than the layers of rocks that form above the lower ones.What are the reactants and products of the ETC (electron transport chain)?
Answer:
Reactants: glucose oxygen and ADP
Products: Water, CO2 (carbon dioxide), and ATP
Electron transport chain (ETC) is a biological process that consists of protein networks that relocate the electron from donors to acceptors through an oxidation-reduction reaction.
This creates an electrochemical gradient across the membrane resulting in ATP formation.
Reactants of ETC are: Glucose, oxygen and ADP.Products of ETC are: The main product is ATP while water and carbon dioxide are the waste products.The electron transport chain uses these reactants in order to produce 38 ATP from 1 glucose molecule.This process occurs in the inner membrane of the mitochondria.Therefore, glucose, oxygen and ADP are the reactants, whereas ATP and water are the end products.
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Which of the following is a product of science a basket weaving b modern bananas c singing d Astrology
Answer:
d
Explanation:
because all answer it isn't false
Answer: b. modern bananas
Explanation:
Science is a discipline which is based upon the study of the natural world on the basis of the facts and data obtain after the experimental trials and associated observations. Fields of scientific study includes biology, physics and chemistry.
Modern bananas is the product of science as it can be composed or constructed by using the knowledge of science and associated technology.
Which is a type of passive transport?
endocytosis
diffusion
gap junction
exocytosis
Answer:
The answer is Diffusion.
Explanation:
Passive transport is a movement of biochemical, atomic or molecular substances through cell membranes without the need for energy overload, while diffusion is an irreversible physical process in which atoms or molecules move from a high region concentration to an area of low concentration, where said process does not require energy input, is frequent as a form of cell exchange.
Most dissolved carbon in the ocean is used to form which structure in marine organisms?
The fronds of giant algae
The muscle tissue of small fish
The nerves of giant mollusks
The skeletons of coral polyps
Answer:
D
Explanation:
Photosynthesis by tiny marine plants (phytoplankton) in the sunlit surface waters turns the carbon into organic matter. Many organisms use carbon to make calcium carbonate, a building material of shells and skeletons
Answer: The skeletons of coral polyps.
Explanation:
The photosynthesis by the aquatic plants, atmospheric carbon dioxide dissolved in the oceanic water, the decomposed and degraded matter of animals and plants can increase the concentration of the carbon dioxide in the oceanic water. This carbon dioxide can be useful to develop the coral reef the hard skeleton structure composed of calcium carbonate by the colonies of the coral polyps.
What is a nonnative species?
A. A species that does not normally live in an area
B. A species that increases biodiversity
C. A species that is a poor predator
D. A species that has no permanent home
Answer:
A species that has no permanent home.
Answer:
I think it's D. A species that has no permanent home .
Which of the following describes the second law of thermodynamics?
Matter is neither created nor destroyed
All natural processes tend to move toward disorder.
Energy is neither created nor destroyed
none of the above
Answer:
None of the above....its the ability to do work
Explanation:
Final answer:
The second law of thermodynamics states that 'All natural processes tend to move toward disorder,' corresponding to the increase of entropy or disorder in an isolated system. This principle is distinct from the first law of thermodynamics, which concerns the conservation of energy.
Explanation:
The second law of thermodynamics is best described by the statement that 'All natural processes tend to move toward disorder.' This principle implies that in any given process, the total entropy (a measure of disorder) of an isolated system never decreases, although it can increase. Therefore, the correct answer to the student's question is 'All natural processes tend to move toward disorder.'
This law explains why energy transfers are not 100% efficient; some energy is always transferred into a less useful form, like heat, thereby increasing the overall disorder of the system. It is this increase in entropy that drives the direction of natural processes and makes certain processes, such as heat flowing spontaneously from a cooler object to a warmer one, impossible.
It is important to note that the statement 'Energy is neither created nor destroyed' refers to the first law of thermodynamics, which deals with the conservation of energy, not the increase of disorder.
The change of England's Biston betularia moth populations from light colored to dark colored is an example of _____.
Answer:
The correct answer for this is: Microevolution.
Explanation:
The change of England's Biston betularia moth populations from light colored to dark colored is an example of 'Microevolution'.
Basically, the change that occurs over time in the allele frequencies within a group of species or population is known as microevolution.
The four processes due to which this change occurs include gene flow, selection (natural and artificial), mutation and genetic drift.
Answer:
Microevolution.
Explanation:
what is directly responsible for matter moving and changing inside an animal body
Answer:
Energy
Explanation:
Energy is directly responsible for matter moving and changing inside an animal body.
Answer:
Energy
Explanation:
Energy is primarily responsible for all sorts of transformation of matter in and outside a body.
A food contains energy , that a plant has entrapped by converting solar energy into chemical energy. . When this food enters into the body, body tries to use this chemical energy for all its metabolic processes in the form of nutrients.
Hence, a food entering body through mouth is acted upon by various physical process such as churning, chewing, diluting, grinding etc. and chemical processes such as enzyme action , acid and base reaction to transform this chemical energy in food into usable form.
Down syndrome, the most common genetic condition in the United States, is also called trisomy 21. What does this mean?
Answer:
Explanation:
It means that chromosome 21 has a third partial or complete copy of chromosome 21. The symptom severities vary somewhat.
Answer:
There are three set of chromosome 21
Explanation:
Trisomy signifies presence of abnormal three chromosomes instead of two.
Down syndrome is also known as trisomy 21 because there are three chromomose -21 rather than two.
There are 46 chromosome in a normal human being which constitutes 23 pairs of chromosome. However, a person suffering from down syndrome has 47 chromosome with an extra chromosome -21.
Glucose provides energy for cells. Different cells have different mechanisms for glucose intake. Intestinal cells contain proteins that transport glucose against its concentration gradient. These proteins couple the movement of glucose to the movement of sodium down its concentration gradient. Red blood cells have transporter proteins embedded in their membranes. When bound by a glucose molecule, these proteins change shape and allow glucose to move down its concentration gradient into the cell.
Based on this information, what type of transport is used for glucose in blood and intestinal cells?
Answer:
From the given information, the transport of glucose in blood across the red blood cells takes place by facilitated diffusion, that involves the spontaneous passive-transport with the help of trans-membrane proteins or transporter proteins to move the ions or molecules down the concentration gradient.
While the transport of glucose in intestines take place via active transport mechanism. It takes place from gut into intestines. It occurs against the concentration gradient with the help of energy molecules like proteins.
Hailey loves to play volleyball. She has the best block and spike on her team. Which of the following statements is most likely true, given her ability to jump, block, and spike so well?
A. She has a high percentage of fast-twitch fibers in her arms and legs.
B. She has a high percentage of slow-twitch fibers in her arms and legs.
C. She has a high percentage of fast-twitch fibers in her arms, but a high
percentage of slow-twitch fibers in her legs.
D. She has a high percentage of slow-twitch fibers in her arms, but a high
percentage of fast-twitch fibers in her legs.
Answer:
the answer is A
Explanation:
because she can jump well so that means she has high amounts of fibers in her legs as well as her arms scince she can block well too.
which does most of the work of the endocrine system APEX
Answer: A compound called a hormone released by an endocrine gland.
Explanation:
The endocrine chemicals and hormones move through the body via blood vessels to the cells. The endocrine system impacts other systems of the body: the nervous system, the circulatory system and the digestive system to make it possible to regulate body functions such as growth, body temperature, digestion and glucose metabolism.
What is the endosymbiont hypothesis?
Answer:it is a theory which describe about the eukaryotes
Explanation:
a theory which state that eukaryotes evolve from different process of free living prokaryotes by incorporated into larger prokaryotic cell
Which best describes the permeability of a membrane?
O
A. The number of molecules in the membrane
O
B. The total thickness of the membrane
O
C. The flexibility of the membrane
O
D. The ability to allow materials to cross a membrane
Answer:
D. The ability to allow materials to cross a membrane
Explanation:
It all has to do with the size of the materials trying to pass through. All other options do not make sense. Thickness, flexibility, and amount of molecules do not describe permeability.
Answer: the answer is D: The ability to allow materials to cross a membrane.
Agricultural land is cleared for limestone mining. Which of these plans prevents the permanent dislocation of local farmers due to mining in this location?
Water the mining area regularly
Reduce the use of heavy machinery in the mining area
Choose other uninhabited locations for limestone mining
Make reclamation mandatory after limestone has been removed
Answer:
Make reclamation mandatory after limestone has been removed
Explanation:
Answer: Option (4)
Explanation: Mine reclamation must be adopted in order to carry out agricultural activities after mining is over in a particular place. This method helps in regaining the essential ingredients upto some extent, for future cultivation.
This method must be adopted before the mining starts. The surface water as well as the ground water can be prevented from getting contaminated by the mining activities. The area selected for mining should be at an isolated place, away from the human inhabitants.
Thus, the correct answer is option (4).
What is the most likely niche partitioning mechanism for the four Mpala herbivores? Support your claim with evidence.
The most likely niche partitioning mechanism for the four Mpala herbivores is diet differentiation through DNA metabarcoding studies which reveal specific dietary preferences, facilitating coexistence and reducing competition.
The most likely niche partitioning mechanism for the four Mpala herbivores is diet differentiation. Each herbivore species likely consumes different types of plants or parts of plants, thereby reducing direct competition for resources. For example, one herbivore may specialize in eating grass while another focuses on browsing leaves from trees.
Niche partitioning through diet differentiation can be supported by DNA metabarcoding studies like the one conducted by Kartzinel et al. (2015) which reveal specific dietary preferences of different herbivore species.
This mechanism allows the Mpala herbivores to coexist in the same ecosystem by utilizing different food resources, ultimately reducing competition and promoting species diversity.
The most likely niche partitioning mechanism for Mpala herbivores is dietary differences, supported by DNA metabarcoding data showing distinct diets. This minimizes competition and enables coexistence.
The four herbivores in Mpala, Kenya, divide their niches primarily based on their diets. Kartzinel et al. assert that (2015), DNA metabarcoding data show that even though these herbivores live in the same habitat, they eat different things. For example, a few animal varieties could principally devour grasses, while others center around bushes or trees, lessening direct rivalry for food assets. The division of their niches is further aided by temporal and spatial factors. Some herbivores, for instance, might forage in different parts of their habitat or eat at different times of the day. These herbivores are able to coexist by minimizing competition thanks to the combination of dietary, temporal, and spatial niche partitioning. Loveridge and Moe (2004), among other significant studies, point out that browsing hotspots play a role in these patterns by providing a variety of feeding opportunities for various plant species in various locations.Consider the overall shape of this cell.
Which geometric solid is the best model for these cells?
Bo.
A. A sphere
O
B. A right circular cylinder
O
C. A square pyramid
OD. A cube
The geometric solid that best model for these cells is a square pyramid. (Option C).
What is square pyramid?
A square pyramid is a three-dimensional geometric figure that has a square base and four triangular faces meeting at a common vertex or apex.
The base of the pyramid is a square, and the triangular faces connect the corners of the base to the apex.
The height of the pyramid is the perpendicular distance from the apex to the base.
So if we consider the overall shape of the cell in the diagram, the geometric solid that best model for these cells is a square pyramid.
Which is a disaccharide ?
Answer:
The common disaccharides are sucrose, lactose, and maltose.
Explanation:
Disaccharide is one type of carbohydrate. It is a simple sugar like glucose. The two monosaccharides link together to form a disaccharide. The monosaccharides combine with a glycosidic bond. These are soluble in water and sweet in taste. The most common disaccharide are sucrose, lactose, and maltose. The sucrose is the common table sugar and form by mixing glucose and fructose. Lactose is present in the milk. It is formed by combining glucose and glucose. Maltose is formed by glucose and glucose.
A disaccharide is a carbohydrate composed of two monosaccharides bonded together during a dehydration synthesis. Familiar examples include sucrose, lactose, and maltose, which each have important roles in biological systems.
Explanation:A disaccharide is a type of carbohydrate that's made up of two simple sugars (monosaccharides) linked together by a covalent bond. Examples of disaccharides include sucrose (table sugar), lactose (milk sugar), and maltose (malt sugar). The bond that holds them together is formed during a dehydration synthesis, a chemical reaction that removes a molecule of water.
For instance, we're all familiar with sucrose, which is made by combining the monosaccharide glucose and fructose. Once these sugars combine, they form a new compound with properties distinct from their constituent parts. Hence, the concept of disaccharides is integral in understanding biological systems, particularly digestion and energy production.
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What could be a result of an injury to the dorsal column?
A.
loss of sensation to pressure and touch
B.
loss of control over all involuntary movements
C.
inability of the body to maintain homeostasis
D.
inability to regulate the sleep-wake cycle
E.
loss of motor control
Answer:
A. loss of sensation to pressure and touch
Explanation:
Posterior column-medial lemniscus pathway also known as the dorsal column–medial lemniscus pathway (DMLP) is a pathway involved in recognition of sensory simulations and is found in central nervous system.
It is involved in conveying different sensations like like touch and vibration from skin and joints. Therefore, it can be said that the pathway plays significant role in perception of sensory information from different parts of the body. If any damage occurs to the pathway it can result in loss of sense of touch and vibration which is ultimately a lack of ability of a person to sense a touch or pressure in the body.
Hope it helps!
Answer:
A. Loss of sensation to pressure and touch
Explanation:
The problematic model of the universe describes the earth as
Answer:
The Ptolemaic model of the universe describes the earth as at the centre,stationary with planets that rotate around it
Which of these statements about water is true? Which of these statements about water is true?
Its atoms share electrons equally.
It can dissolve all known substances.
Its molecules are farther apart in the solid state than in the liquid state.
It has a lower specific heat than nearly all known metals.
Answer:
Its molecules are farther apart in the solid state than in the liquid state.
Explanation:
Unlike most other liquids that reduce in volume with decrease in temperatures, when water goes below 4 degrees centigrade, the volume begins to increase. This is due to the way the water molecules arrange themselves in ice. Water molecules are polar and align themselves with regards to their dipoles. The partially positive hydrogen ends tend to place themselves some distance between two partially negative oxygen ends of the adjacent molecules. This pushes the molecules farther apart in crystalline (solid) form than in liquid form.
Among the provided options, the statement 'Its molecules are farther apart in the solid state than in the liquid state' is true. This is because when water freezes to become ice, the water molecules are forced to be spaced farther apart, forming a crystalline structure.
Explanation:The statement 'Its molecules are farther apart in the solid state than in the liquid state' is the correct answer. Water molecules are indeed closer together in the liquid state due to the polarity and hydrogen bonds between them. When water freezes to become a solid (ice), however, a crystalline structure is formed that forces the water molecules to be spaced farther apart. Hence, the density of ice is lower than liquid water, causing ice to float on water.
This property of water is rather unique as most substances are denser in their solid state than in their liquid state.
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a race car driver drives one lap around a track that is 500 meters in length. what is the drivers displacement at the end of the lap?
Answer:
0 meters
Explanation:
When we talk about displacement, think that the think of it as the measure of the distance between the starting point of the object, from its end point.
Since we are talking about a lap around a track, it would mean that the starting point is also the end point. So if you started and end at the same point, the distance between it would be 0.
What is the nucleolus.
A: the entire DNA found in a cell
B: the membrane surrounding the nucleus
C: a ball of fibers inside the nucleus
D: an information organelle that makes protein
Answer: C
Explanation: The nucleolus is found inside the nucleus and produces ribosomes. This is also where ribosomal DNA genes are transcribed.
Which of the following situations could result in divergent evolution in sympatric populations?
Select all that apply.
A mutation has resulted in some individuals of a plant species flowering early in the spring, while other members of the same species flower much later.
A volcano splits the range of a species of insect into two parts that do not overlap, and insects on opposite sides of the volcano can no longer interbreed.
A mutation during reproduction causes the chromosomes in a species of flowering plant to double, resulting in an individual with four sets of chromosomes.
A seed from a plant is carried by a bird to an isolated island where it can grow and reproduce but is too far away from its original population to interbreed with them.
Answer:
The Other guy is wrong the answer is
A mutation has resulted in some individuals of a plant species flowering early in the spring, while other members of the same species flower much later.
A mutation during reproduction causes the chromosomes in a species of flowering plant to double, resulting in an individual with four sets of chromosomes.
I hope this help for the future people Biology stinks.
Explanation:
According to the RNA world hypothesis, RNA acted as the genetic material and catalyzed reactions in ancient cells. What conclusion can you draw from this?
Answer:
This implies that DNA and proteins evolved after RNA.
Explanation:
It is believed that RNA predated today's cells in evolutionary history. RNA existed as the genetic material of the primitive cells of the time that were mainly constituted of globules of fat oil suspended in water in the oceans and lakes. Even in cells today, RNA molecules themselves can act as catalysts such as in the case of peptidyl transferase reaction that takes place on the ribosome.
The RNA world hypothesis suggests that RNA was the precursor to modern life, serving as both genetic material and a catalyst for biochemical reactions in primitive cells, with the discovery of ribozymes supporting this theory.
The RNA world hypothesis focuses on the concept that RNA was the original biomolecule at the forefront of cellular life, functioning as both genetic material and a catalyst for chemical reactions. This leads to the conclusion that, before DNA and proteins took over these roles, RNA molecules might have formed the basis of primitive life forms, storing genetic information, and facilitating metabolic processes. The discovery of ribozymes, or catalytic RNA molecules, supports this hypothesis, suggesting RNA's central role in early biological evolution. In modern cells, RNA still plays a critical part in genetic regulation and processing, with ribosomes, the cell's protein-synthesis factories, leveraging RNA's catalytic capabilities.