Answer:
dna is replicated before mitosis begins
Explanation:
DNA replication occurs during the S phase of interphase, prior to the onset of mitosis, to ensure each daughter cell has an identical set of genetic information. So the correct option is C.
Explanation:During the cell cycle, DNA is replicated before mitosis begins. This critical process of replication occurs in the Synthesis phase, or S phase, of the cell cycle, during interphase. The purpose of this replication is to ensure that each daughter cell produced after cell division will have an identical copy of the DNA, preserving the cell's genetic information.
Observations through autoradiographs indicate that none of the cells in mitosis were radioactively labeled, confirming that DNA replication does not occur during mitosis but rather beforehand. It's essential for DNA to be copied during interphase so that, during the mitotic phase, which includes mitosis and cytokinesis, each resulting daughter cell contains the same genetic content as the parent cell.
Therefore, the correct answer to the question of when DNA is replicated during the cell cycle is:
C) DNA is replicated before mitosis begins.
What is the main function of cuticle in plants?
1. It prevents water loss.
2. It absorbs sunlight.
3. It protects the plant from predators.
The Correct Answer is: A.It prevents water loss.
Hydrophones help scientists listen to and record sounds from the ocean. Which statement best describes how ocean water affects sound waves?
Answer:
It should be: High water pressure increases the speed of sound.
Please Help Me!!!!!!!
Use Biological Evolution in a sentence
tem cells are undifferentiated cells that have the ability to continue to grow and divide in their nonspecialized state for long periods of time (e.g., months or years).
Although the genes found within stem cells are the same, stem cells differentiate into unique cell types (e.g., muscle cells, nerve cells, etc.) due to
A)mutations in their genetic code.
B)different patterns in their gene expression.
C)meiotic division and fertilization.
D)random segregation and proliferation.
Correct answer: B). Different patterns in their gene expression.
The stem cell is a special type of cell that has the potential to develop into other types of cell. It has self-renewal property that can give rise to any type of cell of the body. Gene is expressed due to the specific combination of genes that turned off and on that regulate how the cell functions.
These cells start to divide in an asymmetrical manner in order to produce a large variety of cells with the unique gene expression, functional and morphological characteristics.
Hence, the correct answer would be option B.
how do electrons gain energy in photosystem 1?
a. They absorb photons.
b. They use energy in the form of glucose.
c. They take energy from ATP molecules.
d. They use energy from a hydrogen ion pump.
Electrons in photosystem I gain energy by absorbing photons, which excites the electrons from splitting water, later used to form ATP and NADPH.
Explanation:Electrons gain energy in photosystem I when they absorb photons. The chlorophyll molecules in the photosystem absorb light and become excited. This energy is then used to excite electrons, which are transferred to the primary electron acceptor. The energized electrons come from the splitting of water, a process that occurs in photosystem II and is aided by the light energy captured by chlorophyll a molecules.
Once excited, the electrons travel through the electron transport chain, contributing to the generation of a proton gradient that leads to the synthesis of ATP in chemiosmosis. Then, absorbing a second photon in photosystem I results in the formation of NADPH molecule, another energy carrier important for the light-independent reactions such as the Calvin cycle.
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Meiosis is different from the process shown because, during meiosis,
A) chromosomes are not replicated.
B) two gametes are made for every original cell.
C) four gametes are produced for every original cell.
D) four somatic cells are produced for every original cell.
Answer: The correct option is -
C) Four gametes are produced for every original cell.
Explanation:
Meiosis is a type of cell division that occurs during the process of formation of gamete ( that are haploid, reproductive cells such as eggs and sperms) particularly in case of organisms that perform sexual reproduction.
During this process, a diploid parent cell produces four haploid cells (gametes or sex cells) through two rounds of cell division ( that are meiosis I and meiosis II).
This is also known as reductional cell division. Thus, four gametes are produced for every original cell.
Therefore, option C) is the right answer.
what is equal to Velocity change per second
Answer:
Acceleration
Explanation:
The rate of change of velocity is known as acceleration. Acceleration is the rate of increase/decrease in motion, action or speed
Suppose the initial speed of any object is [tex]v_0[/tex] and the final speed of any object is [tex]v_f[/tex] and the object changes this speed in a time period of [tex]t[/tex] seconds, then the mathematical formula for acceleration would be
[tex]a= \frac{v_f-v_0}{t}[/tex]
where, "a" is the acceleration
The unit of acceleration if meter per second square.
Over time, some plants growing in an area are crowded out by other plants. The new plants use up water and nutrients needed by the previous plants. The disappearance of the first plants is due to
Why is it important to control the variables you are not testing ?
as you drive along the roadside, you and your friend notice a dead deer that apparently was struck by a car. Your friend comments that she has never seen such a fat deer. "Did you see the size of its abdomen? It was huge!" As a student of forensics, how would you explain to your friend why the abdominal region of the dead deer was so large? CSI
Answer : The size of abdomen appeared to be huge because it stored stomach and many visceral organs.
When the dead deer was spotted by the person it appeared to be much bigger than usual because when the deer was hit by the car it remained there for several hours or may be days and nobody cleared that; From the sun's heat which was falling on the dead deer's body the internal organs were heated up, making them swelled and enlarged than their usual size.
How do the animals in an ecosystem MAINLY acquire the sun’s energy? A) They absorb energy through their skins. B) They obtain energy when they drink water. C) They obtain energy trapped and stored by plants. D) They can convert the Sun’s energy into chemical energy.
Answer:
d is incorrect is c they obtain energy trapped and stored by plants.
What does the term carrying capacity describe?
Question 15 options:
The maximum number of birth rates for a population.
The ability of a population to accept new immigrants.
The population size that the environment can sustain.
The ratio of birth rates to death rates in a population.
Answer: The population size that the environment can sustain.
Explanation:
The carrying capacity can be defined as the maximum number of individuals of the population of a species which an ecosystem can support and sustain in terms of availability of resources such as water, food, shelter and other needs. When the population of the species exceeds the carrying capacity of the ecosystem the population starts declining to maintain the number which a carrying capacity of the ecosystem can sustain. On the basis of the above information, The population size that the environment can sustain. is the correct option.
What do most expirements test?
Most experiments test hypotheses through repeatable experiments. In biology, scientists test various hypotheses related to living organisms and their functions.
Explanation:Most experiments test hypotheses by conducting repeatable experiments. In biology, for example, scientists conduct experiments to test various hypotheses related to living organisms and their functions. For instance, they may test the impact of different variables on the growth rate of a certain plant species. By conducting experiments and analyzing the results, scientists can gather evidence to support or refute their hypotheses.
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1. What caused dissolved iron to rust and deposit in banded iron formations?
a. outgassing
b.oxygen released by living cyanobacteria
c. huge amounts of rain
d. an asteroid impact
2. Which of these was the first source of oxygen in our atmosphere
a. Oxygen produced by living things on land
b. Oxygen released by volcanoes
c. Oxygen released by living cyanobacteria in the ocean which then was released into the atmosphere
d. the original accretion of the Earth
Oxygen released by living cyanobacteria caused dissolved iron to rust and deposit in banded iron formations. This implies the correct answer is B.
The first source of oxygen was the oxygen released by living cyanides in the ocean which then was released into the atmosphere. This implies the correct answer is C.
Further ExplanationQuestion 1:
Banded iron formations are the major part of sedimentary rock. These formations are of always of the earliest part of the earth’s history also known as Precambrian age.
The general theory is that banded irons layers were developed in seawater due to the oxygen that was released by cyanobacteria. The oxygen that was released then joins with dissolve irons to form insoluble iron oxide and a thin layer on the floor of the ocean.
Most of the oldest rock formations and linked with banded iron formations and they are made up of approximately 60% of global iron reserves. Banded iron formations can be found in the following places: United States, Ukraine, South Africa and many more.
Question 2:
The first source of oxygen is oxygen released by living cyanides in the ocean which then was released into the atmosphere.
The first microbe to produce oxygen in our atmosphere is known as Cyanobacteria. Cyanobacteria or blue-green algae produce the first oxygen about 3.5 billion years ago by photosynthesis.
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What caused dissolved iron to rust and deposit in banded iron formations? https://brainly.com/question/2389963One of the most recognizable corrosion reactions is the rusting of iron https://brainly.com/question/12520349KEYWORDS:
banded iron formationscynobacteriaoxygenatmosphereoceanmeteorology is best defend as
Do the trees in your area have much chlorophyll in them right now? Do you think the trees in your area will have more or less chlorophyll in three months than they did now?
Answer:
The trees in my area do have much chlorophyll, and are starting to turn more green now that the winter has passed. This is because it's currently spring. During this time there's more sunlight and many trees, along with enough glucose to sustain them. Now, photosynthesis is taking place, and trees are reproducing. So yes, I do think that in 3 months it'll be summer, and there will be even more sunlight and chloroplast in the trees.
Explanation:
Isn't it funny that now you have an answer if it's fall or spring where you live?
Don't write the exact same thing because I just gave this to my teacher in a-p-e-x in march 2021. So please, our teachers are smart.
Hope this helps! :D
Which type of gene is likely to be widely expressed in the body of someone who contracts the influenza virus?
Answer:
The gene that is likely to be widely expressed in the body of someone who contracts the influenza virus is:
The gene that controls the production of white blood cells.
Explanation:
The reason behind this is because the influenza family viruses attack the human body on a cellular level. Therefore, our immune system has to adapt to it and learn how to defeat them. Now, the cells that form part of the immune system are the white cells. That is the reason behind our answer.
. Leila and Liam are twins and spent their 16th birthday at their favorite amusement park. After riding the biggest and fastest roller coaster in the park, Leila and Liam feel very dizzy and disoriented. Which of the following would play the biggest role in these feelings?
olfactory receptors
basilar membrane
semicircular canals
cones and rods
sensory receptors of the joints
The correct answer is C. Semicircular canals.
Explanation
The semicircular ducts are a part of the inner ear, they are small ducts that contain fluid inside. The semicircular ducts work when they undergo a movement, causing the liquid inside to move and touch the small hairs inside. These hairs send a nervous signal to the brain so that it determines how to maintain the body's balance.
An example of this is the case of Leila and Liam, who underwent a roller coaster movement, causing the liquid in their semicircular ducts to move and touch the hairs in the ducts, sending a nervous message to the brain, this continues even when they get off the roller coaster, that is why Leila and Liam continue to feel that sensation of movement and dizziness. So, the correct answer is C. Semicircular canals.
Justify "Chemical reactions occur faster with the presence of enzymes as long as the conditions are ideal"
1. What are some of the challenges that those working in wildlife rehabilitation face in treating animals?
One of the greatest difficulties in wildlife rehabilitation is not being able to support every animal. Sometimes, despite doctors' and rehabbers' real efforts, animals are not able to be discharged. In order to survive in the wildlife and be releasable, animals require to be 100% healthy. If a bird could not fly, or a mammal could not see, wildlife rehabilitators could not free them back to the wild because they will not sustain.
Wild mammals don't have masters that pay the bills for their treatment. Most wildlife rehabilitators and dispensaries depend on charity from human sponsors to fund for the food, medications, and other supplies they require to care for wild animals. Finding the money required to treat and rehabilitate wildlife can be very challenging.
Injured or ill creatures in custody can be a menace to those attempting to help them. Birds of prey like falcons and owls have powerful feet with sharp hooks that can harm people. Many creatures like raccoons and even squirrels can nibble very hard.
Nearly all of the plant tissue called ______ is made up of cell walls. (fill in the blank)
Why is it that two species cannot occupy the same niche for an extended period of time?
Answer:
In terms of ecology a niche can be defined as role or function an organisms play within the ecosystem. A niche represent the interaction of an organism with the living and non living components of the ecosystem. It is represented by predator-prey relationships, parasitic and mutualistic properties and other functions. The two species cannot occupy the same niche for an extended period of time, this can be explained by competitive exclusion principle. According to this principle, no two species can have the same ecological niche. The two or more species competing for the same resource in an ecosystem the one species having more favorable adaptations will be able to thrive resources better than others. Therefore, this will result in the decrease in abundance, migration and extinction of weak and less competitive species.
Question: Is the cell in the diagram eukaryotic or prokaryotic? Explain your answer using the defining characteristics of cells. Mention structural features of the diagram that support your answer.
Eukaryotic cells have a defined nucleus and other specialized organelles enclosed in membranes. Prokaryotic cells, however, lack a nucleus and other membrane-bound organelles. The cell type can thus be determined from these structural features.
Explanation:Without being able to view the actual diagram, it is difficult to confirm whether the cell shown is eukaryotic or prokaryotic. However, I can provide the defining characteristics of both. Eukaryotic cells possess a defined nucleus, where genetic material is stored, and other specialized organelles, both of which are typically enclosed in membranes. Prokaryotic cells, on the other hand, do not contain a nucleus and lack other membrane-bound organelles. So when you mention structural features in the diagram, look for presence of a nucleus and other organelles for eukaryotic cells and absence of these for prokaryotic cells.
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___________ of glucose produces glycogen, the storage form of sugar, found in the liver and muscles.
A)
Diffusion
B)
Lysis
C)
Polymerization
D)
Reoxygenation
which of the following ecosystem factors is considered biotic?
a.temperature range
b.predator
c.mineral types
d.water chemistry
In an ecosystem, a predator is considered a biotic factor, as it is a living organism that impacts other organisms in its environment. While temperature range, mineral types, and water chemistry are important, they are abiotic (non-living) factors.
Explanation:In an ecosystem, factors can be either biotic (living) or abiotic (non-living). Out of the options given, predator is considered a biotic factor. Biotic factors are all the living organisms that inhabit an environment, including animals, plants, fungi, and bacteria. A predator is an example of a biotic factor because it is a living organism that impacts other organisms in the ecosystem through predation.
Other options like temperature range, mineral types, and water chemistry are considered abiotic factors because they are non-living factors that also play a major role in the ecosystem.
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Illuminated objects are those that
A. reflect light.
B. absorb light.
C. produce light.
All types of respiration starts with the process of _______________, where glucose is broken down to form pyruvic acid.
Sascha notices that steam appears from water only when the water is very hot. What property of water explains this observation?
Water has a high vapor pressure.
Water is densest as a liquid.
Water has a low boiling point.
Water has a high heat capacity.
The answer is definately that water has a high heat capacity
What is the most important organ in human body?
What type of muscle tissue is found in the heart? Compare the distinguishing properties of this muscle to other muscle tissue types.
The heart consists of cardiac muscle tissue, which can contract on its own without nervous system stimulus, unlike other muscle tissues. Skeletal muscle, controlled by conscious decisions, moves the skeleton. On the other hand, smooth muscle is involuntary and is located in places such as digestive tract and blood vessels.
Explanation:The type of muscle tissue found in the heart is called cardiac muscle. It is unique and different from other muscle tissues in that it has the ability to contract on its own without nervous system initiation, a property known as automaticity or inherent rhythmicity.
Comparatively, skeletal muscle tissue is associated with the skeletal system. It is voluntary, meaning its contractions can be consciously controlled. And like cardiac muscle, skeletal muscle is striated, or has a banded appearance due to the organized arrangement of proteins within the muscle cell.
The third type of muscle tissue is smooth muscle. Unlike the other two, it lacks striations and its contractions are involuntary. This tissue type is found in places like the walls of blood vessels and the digestive tract where it helps to propel food along.
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