Answer:
Helium exist as an isotope, its most common isotope is the one that is placed on the periodic table. The helium atom on the periodic table has two electrons, two protons and two neutrons. The proton and the neutron are located inside the nucleus, this means that two protons and two neutrons can be found inside the helium nucleus. Thus, in the pictures given above, the correct picture is the one that contain four particles.
Explanation:
why is the nucleus command center of the cell
Answer: The nucleus is the largest and most prominent of a cell's organelles (Figure 3.7). The nucleus is generally considered the control center of the cell because it stores all of the genetic instructions for manufacturing proteins.
Explanation: Plz can I have brainlest.
Power is measured in _______?
Answer:
joules
Explanation:
i think
25 points if you answer this. Genetic drift and natural selection can both be mechanisms of evolution. However, they are very different mechanisms.
Explain how genetic drift is different from natural selection.
For diffusion to occur, which condition must be met?
A concentration gradient must exist.
A hypotonic external environment must exist.
A hypertonic external environment must exist.
Dynamic equilibrium must exist.
Answer:
A concentration gradient must exist.
Explanation:
For diffusion to occur, a concentration gradient must exist. Therefore, the correct option is A.
The movement of molecules along a concentration gradient is known as diffusion. It is a significant process that all living things go through. Diffusion facilitates the flow of materials into and out of cells.
Without the use of energy, molecules can be transported from an area of high concentration to an area of low concentration through the process of diffusion. Simple diffusion and Complex diffusion are the two types of diffusion. Diffusion was made easier.
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a.
Identify the biotic limiting factor from the choices below.
space
b. vegetation
C. water
d. climate
Answer:
b.
Explanation:
Plants are living things(biotic).
water and climate are non-living things (abiotic)
what is evolutionary mechanism?
pls help>-<
Answer:
Evolutionary mechanism refers to the changes in allele frequencies within a single population.
i am usually single-stranded. is it DNA O RNA ?
Answer:
RNA
Explanation:
DNA is double-stranded DNA mostly and RNA is single stranded mostly.
within which structure does the placenta normally develop ?
Answer:
Uterus
Explanation:
Answer:
Uterus
Explanation:
The female reproductive system mainly takes place here
1.
Which list below describes the next steps of evaporated water through the water cycle? (3 points)
Condensation, precipitation, runoff, ocean storage
Transpiration, condensation, precipitation, ocean storage
Precipitation, condensation, runoff, groundwater
Evaporation, condensation, precipitation, runoff
2.
What is a possible cost of using nonrenewable energy resources? (3 points)
Greenhouse gases
Less water pollution
Sustainable energy
Costs more money
3.
What is the benefit of recycling plastic and paper products to wildlife? (3 points)
Less expense
Clean fuel
Sustainable energy
Fewer landfills
4.
What is the next phase of the carbon cycle for the carbon source labeled A? (3 points)
Label A shows a collection of coal, oil and gas. Label B shows a collection of trees and vegetation. Label C shows sky and open atmosphere.
Photosynthesis
Ocean storage
Fossil fuel emissions
Transpiration
5.
Where is the last storage location for melted snow? (3 points)
Rivers
Ocean
Streams
Mountains
6.
How can the carbon stored in plants reach the atmosphere? (3 points)
Evaporation
Diffusion
Photosynthesis
Cellular Respiration
7.
Which statement best describes the role of plants in the water and carbon cycles? (3 points)
Plants release oxygen when they decompose take in oxygen for photosynthesis.
Plants take in carbon dioxide during photosynthesis and absorb water through their leaves and roots.
Plants take in oxygen during photosynthesis and absorb carbon dioxide through their leaves and roots.
Plants use oxygen to perform photosynthesis and release carbon dioxide as a by-product.
Answer:
1. d
2. a
3. d
4. probably c
5. b
6. d
7. b
Explanation: Got straight A's in all my biology classes, hope this helps!
Some students used information they gathered from lab investigations to prepare a table. They entered the table in their lab notebooks. Which of these correctly identifies the two cells described in the table? Your answer: Cell 1 is eukaryotic, and Cell 2 is prokaryotic. Both Cell 1 and Cell 2 are prokaryotic. Cell 1 is prokaryotic, and Cell 2 is eukaryotic.
Answer:
A
Explanation:
Are bats blind?Non scientific or scientific question?
Answer:Bats are not blind and can in fact see quite well using their eyes. While most bats do have advanced ears that give them a form of vision in the dark known as echolocation, these good ears does not require them to have bad eye
Read the information for transcription and then answer the question. Protein Synthesis Explain the process of transcription.
Answer:
Please find the explanation below
Explanation:
Transcription is the first process that occurs in protein synthesis. It involves the use of the stored information in the DNA molecule to synthesize a mRNA molecule.
Transcription, which occurs in the nucleus of eukaryotes and cytoplasm of prokaryotes, is catalyzed by an enzyme called RNA polymerase. RNA polymerase binds to the double-stranded DNA and begins to unwind it (Initiation). This unwinding causes the nucleotide bases to be exposed in order for the RNA polymerase enzyme to read.
The enzyme reads the bases of the DNA and begins to synthesize RNA nucleotides using the complementary base pairing rule (Elongation) i.e. Adenine base paired with Uracil base (RNA), and Guanine paired with Cytosine etc.
The single-stranded mRNA is released at the end of the transcription process (termination). This is basically what occurs in transcription.
The gene coding for the protein untwists and unzips.
RNA nucleotides form complimentary base pairs with the DNA bases.
Hydrogen bonds and sugar-phosphate bonds form and the mRNA strand is synthesized.
mRNA peels off the DNA and moves to the cytoplasm.
how could the presence or absence of a protein determine a phenotype
Answer:Proteins Dictate Phenotype
Genotype controls phenotype because genes direct the production of proteins . ... Some proteins serve structural functions (for example, in the maintenance of cell and/or tissue shape and rigidity) while others are involved in the transport of molecules and communication between cells.
Answer:
Each protien is essentially a code for a genotype (what the DNA is "saying"). Different genotypes (or DNA combinations) cause the person, plant, animal, etc. to look different.
The lock and key mechanism refers to
What is the main function of the structure labeled A?
It attracts insects and other animals.
It moves the pollen to the ovaries.
It catches pollen.
It produces pollen.
Answer:
D
Explanation:
I did the assignment
The main function of the structure labeled A is it produces pollen. Therefore, the correct option is D.
What is a pollen?Pollen is a microscopic, powdery substance produced by the male reproductive organs of seed plants. It is made up of cells that contain the male gametes (reproductive cells) and is responsible for fertilizing the female reproductive cells (ovules) to produce seeds.
Pollen is often carried from one plant to another by wind, insects, or other animals, where it can then come into contact with the female reproductive organs of a different plant.
If the pollen comes into contact with a receptive ovule, it can fertilize the ovule and produce a seed. Therefore, the correct option is D.
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The question is incomplete, but most probably the complete question is,
What is the main function of the structure labeled A?
A. It attracts insects and other animals.
B. It moves the pollen to the ovaries.
C. It catches pollen.
D. It produces pollen.
Which correctly describes a difference between the male and female
reproductive systems?
O A. Males store gametes in the ovary.
O B. Females produce gametes every day.
C. Males receive gametes from females.
D. Females produce fewer gametes
What describes the difference between the male and female reproductive systems is that "Females produce gametes every day". Option B. This is further explained below.
What is reproductive systems?Generally, The reproductive system is simply defined as the organs that are involved in the production of children.
In conclusion, The reproductive systems of males and females bear differences affiliated with gametes production.
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Answer:
D. Females produce fewer gametimes
Explanation:
Do I really need to?
Unattached earlobes is a dominant trait, E. A parent who is homozygous for unattached earlobes is crossed with a parent who is
homozygous for attached earlobes. Which describes the genotypes of their offspring?
100 percent Ee
100 percent unattached earlobes
100 percent ee
100 percent attached earlobes
Answer:
100 percent Ee
Explanation:
This is a cross involving a single gene coding for attachment or not of earlobes. The allele for unattached earlobes (E) is dominant over the allele for attached earlobe (e). This means that allele E will always mask the phenotypic expression of e in a heterozygous state.
A parent that has same alleles for unattached earlobes i.e. EE is crossed with a parent that has same alleles for attached earlobes i.e. ee. In this cross, all of the offsprings will have a heterozygous genotype, Ee because gametes E and e will be produced respectively by each parent.
Hence, since all of the offsprings will have an Ee genotype, it means 100% of their offsprings will have Ee (HETEROZYGOUS).
Answer:
Its A or 100% Ee
Explanation:
edge 2022
Which scenario causes gene flow
Answer: Migration is one way that genes are transferred from one population to another.
Explanation: Gene flow is caused by a significant change in the population of individuals due to the addition of other individuals whose alleles are slightly different from those of the existing individuals
Answer:
Introgression refers to gene flow from another taxon. While low levels of gene flow between species are not uncommon, it is a serious issue when an introduced invasive species hybridizes with a native species and overwhelms its genetic constitution (genetic swamping). This is a major threat in canids, ducks, fish and plants. For example, exotic rainbow trout introduced into the habitats of native cutthroat trout in the Western United States led to hybrid swarms that eventually overwhelmed the local species. Introgression is readily detected by molecular genetic and genomic methods.
Explanation:
HOPE ITS USEFUL
Think back about your experience in this lab using a dichotomous key. What might make it hard for someone to use a dichotomous key? Make a list of possible reasons.
Answer: why it is hard to use dichotomous key in the lab are;
If the organisms you want to use it for are similar.
If you can't see the little characteristics posses by the organisms you are using it for.
If all the pictures does not reveal all the important features of the organisms.
It is very difficult to use it to determine the anatomical structure.
Explanation:
Dichotomous key is an important method that is use in biology to identify organisms by separating or dividing the organisms into two groups. It is a tool created by scientists to help them identify organisms or objects. Once the organisms are group into two, more information is revealed more individually.
Answer:
The person who commented before me was correct. They should get brainliest. Below is the same thing they wrote just in paragraph form.
If the organisms you want to use it for are similar. If you can't see the little characteristics posses by the organisms you are using it for. If all the pictures does not reveal all the important features of the organisms. It is very difficult to use it to determine the anatomical structure.
Question 5
is to the Calvin cycle.
Chlorophyll is to the light reactions as
O NADP+
O carbon dioxide
O ATP
O ATP synthase
O RuBP
The center of the cross section of a root contains called
Answer:
pith
Explanation:
The root is from a monocot and this central tissue is called the pith, like what is found in stems.
what are the molecules that make up the DNA rail?
If a lunar eclipse occurs tonight, the next lunar eclipse would occur?
Answer:
in 10 years
Explanation: im pretty sure
Answer:
every 2.5 years
Explanation:
Analicen el cariotipo humano y den dos ejemplos de pares de cromosomas metacéntricos, dos ejemplos de pares telocéntricos y dos ejemplos de pares acrocéntricos.
Analyze the human karyotype and give two examples of pairs of metacentric chromosomes, two examples of telocentric pairs, and two examples of acrocentric pairs.
Answer: The test that is conducted to evaluate and identity the shape,size and number of chromosomes in cells of organism is called the Karyotype.
Metacentic chromosomes are X - shaped chromosomes. They have centromere at the middle, which makes the arms of the chromosomes equal in length. Therefore any type of chromosomes with equal length of arms is said to be Metacentic. Thus chromosomes on position 1,13, 16 , 19 and 20 are examples.
When a pair of chromosomes showed a regular segregation at anaphase of meiosis, they are said to be telocentric. They are type of chromosomes in which the centromere are located at the terminal ends of the chromosomes, with the telemeres extending from theses ends.Hence during segregation, the ends of telocentric chromosomes are orientated towards the poles of the cells. example is the alphabets ''i'' shaped chromosomes in mice and 29 pairs autosomes in Angora goats.
When the centromere is located in such a way that one arm lenght of a chromosomes is longer than the other, then this is called acrocentric. Example is chromosome 21 of down syndrome.others are 13, 14, 15, 22, and Y-chromosomes.
Explanation:
F. Answer the following questions in brief.
1. Why should we use fossil fuels judicially?
3. Define the term 'fossil fuel. Give two examples.
4. How can we conserve fossil fuels?
5. What is calorific value of a fuel?
6. What are conditions required for the formation of fossil fuels?
2. Give full form of CNG. Why is it preferred over other fossil fuels?
1. fossil fuels should be used judiciously as they can be exhausted if used excessively and will take time to replenish
2. fossil fuels are fuel formed by natural processes such as decomposition of dead organisms .
3. They can be easily exhausted
4.The calorific value of a fuel is the quantity of heat produced by its combustion i.e at constant pressure and under “normal” (standard) conditions (i.e. to 0 degree C and under a pressure of 1,013 mbar).
5. COMPRESSED NATURAL GAS . CNG preferred than fossil fuel because it produce greenhouse gases upon combustion, it is a more environmentally clean alternative to other fossil fuels
Answer:
1. fossil fuels should be used judiciously as they can be exhausted if used excessively and will take time to replenish
2. fossil fuels are fuel formed by natural processes such as decomposition of dead organisms .
3. They can be easily exhausted
4.The calorific value of a fuel is the quantity of heat produced by its combustion i.e at constant pressure and under “normal” (standard) conditions (i.e. to 0 degree C and under a pressure of 1,013 mbar).
5. COMPRESSED NATURAL GAS . CNG preferred than fossil fuel because it produce greenhouse gases upon combustion, it is a more environmentally clean alternative to other fossil fuels
Explanation:
A student learns that pure water freezes at 0°C. The student wants to find out how much salt needs to be added to the water to lower the freezing temperature by two degrees. Which statement explains why this question can be answered through scientific inquiry?
The question likely has more than one answer.
The question has already been answered by scientists.
The question can be investigated through a group of experiments.
The question can be answered through mathematical calculations
Answer:
The question can be investigated through a group of experiments.
Explanation:
The question can be investigated through a group of experiments. This statement explains why this question can be answered through scientific inquiry because in science, after a question is asked and an hypothesis is made, experiments are carried out and observed to further verify the accurate measurements.
11. The behavior of the land
masses over geological time
illustrates the theory of
Answer:
Continental drift theory
Explanation:
Continental drift theory refers to the movement of land masses over the earth's geological time. This movement n of the masses of the earth allows us to conclude that the continents change their shapes over time and change, including their location in different regions of the planet.
As we already know the movement of the masses of the earth is done in relation to the movement of the tectonic plates.
ATP molecules, which are used for energy by cells, are built during all three stages of cellular respiration. Which stage of cellular respiration generates the most ATP molecules? (1 point) The Krebs cycle Glycolysis The electron transport chain Fermentation
Answer:
Electron transport chain.
Explanation:
Based on the genotype of AB blood, what relationship do the A and B genes have?
A is recessive.
B is recessive.
They show incomplete dominance.
They are codominant.
Answer:
They are codominant.
Explanation:
A and B are both expressed , when they are both inherited.
Answer: PLATO answer:
They are codominant
Explanation: The A and B antigens are equally present on the red blood cells, so the relationship of the A and B genes is codominant.
Which option gives an accurate reason why ethical guidelines are needed for the way scientific information is communicated?
(Select all that apply)
Businesses can perform and fund research studies, which potentially creates bias.
Scientific journals have a long history of publishing questionable research.
Government funding of research studies has the potential to create bias.
Poor research could potentially impact the health and welfare of the public.
Answer:
Poor research could potentially impact the health and welfare of the public.
Explanation:
Scientific studies are generally believed to be based on thorough research. This implies that members of the public always trust scientific publications and rely on same as a source of accurate and trustworthy information.
Science, being empirical in nature is believed to eliminate bias in its research and reportage of studies. Scientific research publications is often a source of information for field practitioners in diverse disciplines as well as the general public.
Poor research will mislead a large section of the public, both professionals in that field as well as laymen. This poor research could potentially impact the health and well being of members of the public negatively because they may be led to believe false information which can be disastrous. This is the reason why ethical guidelines are needed for the way scientific information is communicated.