Answer:
Silica
Explanation:
A unique feature of diatom anatomy is that they are surrounded by a cell wall made of silica (hydrated silicon dioxide), called a frustule
Hope this helps!
Answer:
A diatom has a cell wall made of silica.
Explanation:
Diatoms are eukaryotic phytoplankton cells known for their silica-containing cell walls (frustales), and are responsible for approximately 20% of total primary productivity globally. Diatom silica is a form of biogenic opal, containing oxygen isotopes and can be used in lacustrine and marine paleoenvironmental studies.
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A scientist develops a computer model of gene expression. However, the model does not
include introns and exons. Which is the most likely result of a simulation that is based on
this model?
A Genes are not transcribed into mRNA.
B Pre-mRNA is not edited, and is used as mRNA.
C Transcription occurs normally, but some errors occur during translation.
D Transcription occurs normally, but mRNA is not translated into proteins.
Answer:
I think the answer is B.Tell me if I'm wrong...
The correct option is B. A scientist develops a computer model of gene expression. However, the model does not include introns and exons. Which is the most likely result of a simulation that is based on this model is Pre-mRNA is not edited, and is used as mRNA.
In eukaryotic cells, gene expression involves two main processes: transcription and translation. During transcription, DNA is used as a template to produce pre-messenger RNA (pre-mRNA). This pre-mRNA includes both introns and exons. Introns are non-coding sequences that are removed during the process of RNA splicing, while exons are the coding sequences that remain in the mature mRNA.The splicing process is essential for producing a functional mRNA that can be translated into a protein. If a computer model of gene expression does not include introns and exons, it implies that the model does not account for the splicing mechanism.Let's analyze the options based on this information: A. Genes are not transcribed into mRNA. - This option is incorrect because the model not including introns and exons does not prevent transcription from occurring. Genes would still be transcribed into pre-mRNA.B. Pre-mRNA is not edited, and is used as mRNA. - This option is correct. Since the model does not include introns and exons, it suggests that the pre-mRNA is not being spliced to remove introns and join exons. Therefore, the pre-mRNA, which includes both introns and exons, would be used as if it were mature mRNA.C. Transcription occurs normally, but some errors occur during translation. - While it is true that transcription would occur normally, the primary issue would not be errors during translation but rather the use of unspliced pre-mRNA for translation, which would lead to incorrect or non-functional proteins.D. Transcription occurs normally, but mRNA is not translated into proteins. - This option is incorrect because translation would still occur. However, the proteins produced would likely be non-functional due to the inclusion of intronic sequences that would normally be removed.Therefore, the most likely result of a simulation based on this model is that pre-mRNA is not edited and is used as mRNA, leading to potential issues in the proteins produced during translation."
The picture below show a sperm cell fusing with an egg cell during sexual reproduction what is name of this process
Answer:
Fertilization occurs when the nucleus of both a sperm and an egg fuse to form a diploid cell,
Explanation:
Hi there!!
This process is called fertilization. The sperm begins to fuse with the egg, and new life begins!
Hope this helps!!
what 2 things make a ionic bond????
Elements that are metal and elements that are nonmetal together creates an ionic bond. Explanation:
Answer:
Krypton and Lithium are most likely to form an Ionic Bond
Explanation:
For a single Bond it is possible to define an Ionic Bond when the electronegativity difference between the two atoms of the bond is greater than 2,0.
describe the weather on three days this week
Answer:
Monday: It was cloudy
Tuesday: It was windy but clear
Wednesday: It was raining all day
5 things I learned from the amoeba sisters biological levels in biology
Answer:
zenuts
Explanation:
,prokaryotes and eukaryotes, all living things have cells,some thigs that grow are not living there are two types of cells animal cells and plant cells
Compare and contrast domains and kingdoms. In your answer, include at least one way they are similar and one way they
are different.
Answer:
The key difference between kingdom and domain is that the kingdom is one of the five major groups of living organisms while the domain is one of the three taxonomic categories of living organisms above the kingdom level.
These are the similarities between kingdom and domain:
1)Kingdom and domain are two types of categories to classify living organisms.
2)Kingdoms are coming under the domains.
3)All living organisms belong to three domains as well as to five kingdoms.
Explanation:
You can write any one of the similarities!
The
A. right atrium B. left atrium C. right ventricle D. left ventricle
receives oxygen-poor blood from the body and pumps it to the
A. right atrium B. left atrium C. right ventricle D. left ventricle
through the tricuspid valve.
Answer:
B. left atrium and C. left ventricle
Wire is used to attach a battery to a penny and is then used to light a small light bulb. The light bulb is lit due to which of the following? Question 10 options: static electricity electric current electron overflow moving protons
Answer:
electron flow
Explanation:
definition of electricity is electron flow hope this helps god bless
Which of the following accurately describes one of the possible steps in testing soil PH?
A.) Water and baking soda are added to the soil
B.) A blend of baking soda and vinegar are added to the soil.
C.) The soil is washed and drained thoroughly before testing.
D.) The soll is dried completely.
The correct step for testing soil pH is to wash and drain the soil thoroughly before testing. Baking soda and vinegar, which react with each other, are not used for pH testing. The pH level indicates the soil's acidity or basicity, determined by the concentration of hydrogen ions.
C is correct
Explanation:The question at hand involves the process of determining the pH level of soil, which is a measure of its acidity or basicity. One of the possible steps in testing soil pH could involve adding substances to the soil and observing the reaction. However, when mixing vinegar, which contains acetic acid, and baking soda, which is a base, you would witness a reaction that would not be helpful for soil pH testing, as it would create a new substance rather than help determine the pH of the soil.
Instead, a proper step for testing soil pH would be to wash and drain the soil thoroughly before testing to remove any contaminants that may affect the pH reading. After cleaning, one would typically use a pH testing tool such as litmus paper or a digital pH meter to measure the soil's acidity or basicity. The presence of high concentrations of hydrogen ions would indicate an acidic pH (below 7), while low concentrations would indicate a basic pH (above 7).
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Final answer:
The correct step in soil pH testing is option C) the soil is washed and drained thoroughly before testing; adding substances like baking soda or vinegar, which alter the soil's pH, is not part of the correct procedure.
Explanation:
The correct step in testing soil pH is C) The soil is washed and drained thoroughly before testing. This is because the pH measurement requires a sample where the soil particles are in suspension with a liquid, typically water, so that the glass electrode can measure the hydrogen ion activity in the solution. The soil should not be dried completely as it needs to be in a state that allows for hydrogen ion exchange. Adding water to the soil makes a water-soil suspension which can then be tested for pH. Adding substances like baking soda (a base) or vinegar (an acid) to the soil would alter its pH and thus would not be part of a proper soil pH testing procedure.
If vinegar were added to baking soda, there would be a chemical reaction that produces carbon dioxide gas and water, resulting in a solution with a neutral pH of around 7. However, this reaction is not relevant to the proper method of soil pH testing, which does not involve baking soda or vinegar.
When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n)
The compound formed by the combination of 1 carbon atom with 2 oxygen atoms is called carbon dioxide, or CO2.
When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called carbon dioxide (CO2). This compound forms when carbon atoms and oxygen atoms create two double covalent bonds, resulting in the molecular structure of O=C=O. The carbon atom shares four electrons with the oxygen atoms (two with each), allowing all the atoms involved to achieve greater stability.
Describe evolution in genetic terms, using the words allele, gene pool, and
population in your response.
Answer:
gene pool i know
Explanation:
Answer:
A gene pool is the combined genetic information of all members of a particular population. Allele frequencies are the number of times certain alleles occur in a particular gene pool compared with other alleles. ... It can lead to changes in allele frequencies and the evolution of traits.
What are superbugs and why are they so dangerous?
Answer:
Superbugs are viral infections caused by bacteria that are resistant to common antibiotics. Since the inception of antibiotics, the bacteria they treat have been adapting and changing in order to build up resistance.
Explanation:
hese antibiotic-resistant bacteria are called superbugs, and they can cause severe bacterial infections that are extremely difficult to treat. Each year, superbugs infect more than 2 million people and kill at least 23,000 people nationwide.
How are the products represented in the chemical equation for photosynthesis?
A. 02 + 6CO2
B. C6H12O6 + 6H20
C. 6CO2 + 6H20
D. C6H12O6 + 602
Using Newton's Second Law of Motion, explain how the skeletal-muscular system works to lift lighter and heavier objects.
Answer:
the muscular system provides force to lift the mass of the objects. The heavier objects require more force than light objects.
Explanation:
when does meiosis occur?
Answer:
it takes place after puberty. Produces haploid sperm cells with 23 chromosomes. A single diploid cell yields four haploid sperm cells through meiosis
we appear to be solid but which of the following components is critical for all living things
Answer:
1. Carbon
2. Hydrogen
3. Oxygen
4. Nitrogen
5. Phosphorus
6. Sulfur
Explanation:
Purifying the Five Elements of Our Being. Everything in nature is made up of five basic elements: earth, water, fire, air, and space.
With examples, discuss the role of sensory memory on long term recall
Explanation:
How Does Sensory Memory Work?
During every moment of your existence, your senses are constantly taking in an enormous amount of information about what you see, feel, smell, hear, and taste. While this information is important, there is simply no way to remember each and every detail about what you experience at every moment. Instead, your sensory memory creates something of a quick "snapshot" of the world around you, allowing you to briefly focus your attention on relevant details.
Types of Sensory Memory
Experts also believe that different senses have different types of sensory memory. The different types of sensory memory have also been shown to have slightly different durations.
Iconic memory, also known as visual sensory memory, involves a very brief image. This type of sensory memory typically lasts for about one-quarter to one-half of a second.
Echoic memory, also known as auditory sensory memory, involves a very brief memory of sound a bit like an echo. This type of sensory memory can last for up to three to four seconds.
Haptic memory, also known as tactile memory, involves the very brief memory of a touch. This type of sensory memory lasts for approximately two seconds.
Final answer:
Sensory memory acts as the initial filtering stage in the memory process, briefly holding sensory information such as sights and sounds. This information will only transfer to long-term recall if deemed valuable and given attention, enabling it to move through to short-term and then long-term memory; examples include the use of visual studies aids to enhance recall during tests.
Explanation:
The role of sensory memory in long-term recall can be understood by examining its position in the memory process. Sensory memory is the earliest stage of memory, where sensory information is stored for a very brief period. For example, the sight of a vivid image or the sound of a unique melody might enter sensory memory but will quickly fade unless attended to. When we deem sensory information as valuable, we consciously direct our attention to it, thereby transferring it into short-term memory (STM), where it is temporarily held.
To form long-term memory, the information must be thoughtfully processed. An example of sensory memory influencing long-term recall is when a student intensely studies an image related to a concept; the vividness of the image may help in transferring the information from sensory memory to long-term memory, where it can be retrieved later. This is why visual aids are often useful in educational settings. Long-term memories can be retrieved through recall, recognition, and relearning. For instance, studying with diagrams can help you easily recall the information during a test, or recognize the correct answer when seeing the diagram on a multiple-choice exam.
Explain why having only one ventricle makes the circulatory system less efficient than having two ventricles.
A double-circulatory system compromising two ventricles will be more efficient than with a single ventricle.
Explanation:
When there are two ventricles, they can receive impure deoxygenated and pure oxygenated blood separately.
The human heart is separated into four chambers. The right and left side are separated by the septum. The right ventricle collects deoxygenated blood from right atrium. This deoxygenated blood is pumped via the pulmonary artery to the lungs for reoxygenation. This part of circulation is pulmonary circulation.
The left ventricle receives oxygenated blood from the left atrium and pumps it to all parts of the body through the aorta. This part of circulation is systemic circulation.
Hence to efficiently perform both systemic and pulmonary circulation, two ventricles are important.
Some animals like frogs have one ventricle and their circulatory system is less efficient.
A heart with two ventricles, like a mammalian heart, is more efficient than a heart with only one ventricle because it separately pumps oxygenated and deoxygenated blood, improving oxygen delivery to the body's tissues and enhancing metabolic processes.
Explanation:A heart with only one ventricle, such as that in fish or amphibians, makes the circulatory system less efficient due to the mixing of oxygenated and deoxygenated blood. This system restricts the amount of oxygen that can reach various organs and tissues, limiting the overall metabolic capacity. The anatomy of a three-chambered heart, with two atria and one ventricle, as seen in amphibians, partially mitigates this inefficiency by facilitating double circulation. However, the system is still not as efficient as a four-chambered heart with two atria and two ventricles, like in mammals, where oxygenated and deoxygenated blood are completely separated.
In a mammalian heart, the left ventricle, which is thicker and stronger, pumps oxygenated blood to the body providing the necessary pressure to overcome the resistance of the long systemic circuit. The right ventricle, on the other hand, pumps deoxygenated blood to the lungs for reoxygenation. The pressure required for this process is lesser as the pulmonary circuit is shorter and offers less resistance.
So, the inherent structure and functioning of the two ventricles in a four-chambered heart allow for a more efficient and effective circulation of blood, enhancing oxygen delivery to the tissues and boosting metabolic processes.
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what is the major difference between primary and secondary succession
Answer:
The main difference between Primary and Secondary succession is that primary succession occurs in the land where there is no initial vegetation where as secondary succession occurs in a land that has primary vegetation.
Explanation:
The primary succession transforms a bare area of land into the pioneer stage, while the secondary succession involves the transformation of the pioneer stage to seral stages.
What do you mean by Succession?Succession may be defined as the gradual and continuous replacement of one community by another community over time.
Primary succession starts for the very first time, where no life existed before, while secondary succession starts from a site where life existed before.
Examples of primary succession include igneous rocks, glaciers, etc. Secondary succession is faster than primary succession and occurs after fire activities.
Therefore, it is well described above.
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Which of the following is the best definition of a population?
O all of the above
O multiple different species living together in a given area
O organisms of the same species living in a given area
O the interaction between the living and nonliving factors in an environment
Answer:
All of the above----------
The correct option is c. organisms of the same species living in a given area. A population consists of organisms of the same species living and interacting in a given area. An example is all angelfish in a specific part of the ocean. Multiple populations can exist within an ecosystem, each representing a single species.
The best definition of a population is organisms of the same species living in a given area.A population consists of all the individual organisms of the same species that live and interact in the same area. For example, all of the angelfish living in the same area of the ocean make up the angelfish population. Different populations inhabit an ecosystem, but each population includes only one species.Thus the correct option is c. organisms of the same species living in a given area
Referring to the reference periodic table, what do the elements fluorine, chlorine, and bromine have in
common?
All are located in the same period.
All have metallic properties.
All are halogens, so they are not very chemically active.
All have the same number of valence electrons.
Answer:
D, All have the same number of valence electrons.
Explanation:
they are located in the same group so they should have the same number of valence electrons
All have the same number of valence electrons fluorine, chlorine, and bromine have in common.
What is Periodic table?All identified chemical elements are arranged in rows (referred to as periods) and columns (referred to as groups) in the periodic table of chemical elements, also known as the periodic table, in ascending order of atomic number.
The periodic table is used by scientists to quickly refer to details about an element, such as its atomic mass and chemical symbol. Scientists can identify trends in element properties like electronegativity, ionization energy, and atomic radius thanks to the periodic table's arrangement.
Numerous scientists worked on the issue of grouping the elements, but Dmitri Mendeleev is generally recognized as the periodic table's creator.
Therefore, All have the same number of valence electrons fluorine, chlorine, and bromine have in common.
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Which statement describes competition in an environment
Answer:
its c i did the test a day ogo :)
Explanation:
Directions: For each of the following, write either P for pioneer species or C for climax community in the
lines provided.
1. beech-maple forest
2. lichens
3. mosses and ferns
Directions: Complete the events chain about primary succession by placing the following entries in the
correct order.
Volcano erupts.
Animals arrive.
Lava forms new land
composed of rock.
Large plants grow.
Lava cools.
Lichens die and decay.
Soil forms.
Lichens and the forces of wind and
erosion help break down rocks
Answer:
1. C
2. P
3. P
-
Volcano Erupts
Lava Forms New Land
Animals Arrive
Explanation:
The pioneer species are hardy species which are the first to colonize barren environments or previously biodiverse steady-state ecosystems that have been disrupted, such as by fire. Meanwhile,the climax community, or climatic climax community, is a historic term for a boreal forest community of plants, animals, and fungi which, through the process of ecological succession in the development of vegetation in an area over time, have reached a steady state.
Final answer:
For the task, the beech-maple forest is a climax community (C), while lichens, and potentially mosses and ferns, are pioneer species (P). In the primary succession events chain, the order begins with a volcanic eruption and ends with the arrival of animals, proceeding through stages where lichens play a crucial role in soil formation.
Explanation:
For the given statements, you should write:
Beech-maple forest - C for climax communityLichens - P for pioneer speciesMosses and ferns - P possibly for pioneer species, but it can depend on the stage of successionCompleting the events chain for primary succession:
Volcano erupts.Lava forms new land composed of rock.Lava cools.Lichens and the forces of wind and erosion help break down rocks.Lichens die and decay.Soil forms.Large plants grow.Animals arrive.Primary succession begins with pioneer species like lichens that can live on new rock surfaces. These organisms help break down the rock into soil, allowing for other species to grow. Over time, a stable climax community establishes, which can be quite different from the initial bare rock environment.
Which statement describes Mendel’s hypotheses regarding gametes?
Answer:
A gamete carries one allele for a gene
Explanation:
Mendel's hypothesis is that genes segregate in the formation of gametes, and independently assort in equally likely ways.
Answer:
B) A gamete carries one allele for a gene.
Explanation:
Edgty
Of the 8 characteristics of life (RAREHOGG), which characteristics do
viruses have that a person might use to argue in favor of considering
viruses are living? *
Adapt, have Genetic Material (Nucleic Acids), Reproduce
Reproduce, made of cells, use and make Energy, able to Grow and develop
Adapt, have Genetic Material (Nucleic Acids), Organized (made of) cells, use and
make Energy
O
Reproduce, have Genetic Material (Nucleic Acids) and Adapt
Answer
AdaptationGenetic materialReproduceExplanation:
In principle, viruses are considered as non living because they don't fulfill all eight characteristics of living organisms, i.e. RAREHOGG (reproduction, adaptation, response to stimuli, energy production, homeostasis, organization of cells, growth and development, and genetics). Specifically, they don't have energy metabolism, they don't grow, they don't respond to stimuli. However, they can adapt the environment and reproduce. But they do not reproduce independently, rather they need a host cell and use its machinery for reproduction. Based on these reasons, they are considered as living organisms.
Viruses display some characteristics of life such as Reproduction, possession of Genetic Material (Nucleic Acids), and Adaptability. They use a host cell to replicate, contain DNA or RNA and can mutate to adapt and survive within their host.
Of the eight characteristics of life, according to the RAREHOGG acronym, viruses possess a few that might bolster arguments for classifying them as living organisms. These characteristics are Reproduction, the presence of Genetic Material (derived from Nucleic Acids), and the ability to Adapt.
Viruses cannot reproduce on their own - they appropriate the machinery of a host cell to replicate their own genetic material. This replication is a form of reproduction. Furthermore, all viruses have genetic material, in the form of DNA or RNA, which is a significant characteristic of life. Lastly, viruses can adapt to their environment. They mutate or change their genetic material to survive within their host efficiently. This adaptability is a crucial characteristic shared by all forms of life.
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What happens when a magnesium ion is attracted to a chlorine ion?
O
A. They form a covalent bond.
B. They form an ionic compound.
O
C. They share electrons.
O
D. They form a gas.
Answer:
B. They from ionic compounds.
Ionic Compounds is formed by the reaction of Metal and Non-metal.
Can someone please help me with this question??
Hello!
Let's see; the darker the crabs are, the easier it is for them to survive. And each dominant allele adds more pigment. So the answer would be AABBCC because all of the alleles are dominant, making the crab harder to find which is the ideal for all crabs. :)
Hope this helps!
What regulates the temperatures on Earth and protects it from harmful UV rays and meteors?
A. Earths magnetic field
B.Earths atmosphere
C. Earths moon
D.Earths ocean's
Answer: B. Earth's atmosphere
Explanation: You may think that it's the magnetic field because it talks about harmful UV rays. The field doesn't stop them. It only stops solar wind. The atmosphere scatters the UV rays to protect us. It also burns up meteors that attempt to hit Earth.
[ B. Earths atmosphere. ]
The atmosphere regulates the temperatures on Earth and protects it from harmful UV rays and meteors. In the stratosphere, it is heated by the ultraviolet radiation of the sun. If it weren't for the stratosphere, the rays from the sun would be deadly. In the troposphere, all of Earths weather occurs in it. The air in the troposphere is the densest as it contains 3/4 of all mass in the entire atmosphere.
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12. Explain why a DNA molecule can be used to
determine whether somconc is or is not the parent
of a particular child.
Answer:
DNA paternity testsExplanation:
The DNA of an individual is equal and the same in every somatic cell. While in egg or sperm, the chromosome number and DNA amount is half as compared to somatic cells. In sexual reproduction, one cell comes from father and one cell comes from mother brings the DNA of both parents and finally fuse together and forms a unique combination of genetic material, so the genetic material of an individual is derived from both parent in equal amounts .
Comparing the DNA sequence of one individual to the DNA sequence of other individual can prove what is the relation between them and if one of them was derived from the other, but DNA paternity tests are not 100% accurate. Specific sequences are examined to find the difference and similarities.
Besides nuclear DNA, mitochondria also contain their own, called mitochondrial DNA. The pattern of inheritance of mitochondrial DNA is that it passes only from the mother to the child without any shuffling. So, mitochondrial DNA is used only used to test for maternity not for paternity.
Some of the DNA tests like DNA paternity test can help to determine the parent of a particular child. In the test, the DNA is matched of the child and the parent.
What is DNA paternity test?DNA or the deoxyribonucleic acid refers to the genetic material, which one inherits from the mother and father. In the DNA paternity test, the DNA is used, which is generally obtained from a cheek swab to find the biological father of the child. Paternity means fatherhood.
The test is almost precise, but not 100 percent accurate. The test is mainly performed to attain legal rights to child custody and to determine the genetic conditions, which can influence one's health.
Thus, DNA test is done to find the parent of the child.
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