The molecules that capture light
energy are called...
A. mitochondria.
B. lysosome.
C. pigments.
Answer:
C
Explanation:
thats the answer im done whit that
Question 21
As human migrated away from the equator, what may have been a selective
pressure against more melanin?
Cold weather and too much body hair
Lower UV radiation and more DNA mutations
Higher UV radiation resulting in more vitamin D synthesis
Lower UV radiation resulting in less vitamin D synthesis
Answer:
Higher UV radiation resulting in more vitamin D synthesis.
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Thanks!
Explanation:
Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years.
Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years.During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3.
Help?
The model bellow shows a process that occurs in the human body (the question then shows the following image and then continues).
Based on this model, which of the following statements is true about the energy stored in the ATP molecule?
A. ATP is absorbed in the cytoplasm by the glucose and transported through the mitochondria.
B. ATP is converted to oxygen and passes through the mitochondria.
C. ATP is created when water and carbon dioxide combine in the cytoplasm.
D. ATP is released from the glucose when it is broken down in the cytoplasm and the mitochondria.
Answer:
A. ATP is absorbed in the cytoplasm by the glucose and transported through the mitochondria.
Explanation:
i need help now.
pls.
which is a tissue?
Answer:
C
Explanation:
even though it looks like an average guy your skin is a tissue, you can also hover over it and says what the pictures are.
Answer:
c
i did the test
lol
hope it helps
Explanation:
Which one of the kingdoms is not characterized by eukaryotic cells
Answer:
Eukaryotic organisms that cannot be classified under the kingdoms Plantae, Animalia or Fungi are sometimes grouped in the kingdom Protista.
Explanation:
Write a 600 word report discussing nuclear reactors. The report should include a description of the way a reactor works and the theory behind nuclear reactions. Be sure to answer these questions: What are breeder reactors? How are they different from regular nuclear reactors? What are their advantages and disadvantages?
Answer:
Explanation:
A nuclear reactor is an installation capable of initiating, maintaining and controlling the chain fission reactions that take place in the reactor core, consisting of the fuel, coolant, control elements, structural materials and moderator in the case of nuclear thermal reactors.
The core is the part of the reactor where the nuclear chain reaction is produced and maintained.
Components of the core:
The fuel of a nuclear reactor is fissionable material.
Control rod beams provide a rapid means of controlling the nuclear reaction, allowing rapid changes in reactor power and eventual shutdown in case of emergency.
The neutrons produced in fission have a high energy in the form of velocity. Their speed should be reduced to increase the probability of other atoms fissioning and not to stop the chain reaction. This is achieved by elastic collisions of the neutrons with the nuclei of the moderator.
Most of the energy released by fission is in the form of heat. To be able to use this, a refrigerant must pass through the interior of the reactor that absorbs and transports this heat.
In a nuclear chain reaction, a certain number of neutrons tend to escape from the region where it is produced. This neutron leakage can be minimized by the existence of a reflecting medium, thus increasing the efficiency of the reactor.
When the reactor is in operation, a large amount of radiation is generated. Protection is needed to isolate the installation workers from radiation caused by fission products. Therefore, a biological shield is placed around the reactor to intercept these emissions.
A breeder reactor is a nuclear reactor that generates more fissile material in the fuel than it consumes. Considered highly attractive because of their superior fuel economy: a normal reactor consumes less than 1% of the natural uranium that starts the fuel cycle, while a 'breeder' can burn it almost completely. It also generates less waste for the same amounts of energy. Breeders can be designed to use thorium, which is more abundant than uranium. Currently, there is renewed interest in both breeder designs due to the increased price of natural uranium.
All commercial reactors breed fuel, but they have low (though still significant) breeding ratios when compared to machines that are traditionally considered breeders. In recent years, the commercial energy industry has been emphasizing high burn fuels, which last longer in the core of the reactor.
Reproduction of fissile fuel is a common feature in reactors, but commercial reactors are not optimized for this feature which is referred to as improved burning. Up to one-third of all electricity produced in the current U.S. reactor inventory comes from reproducible fuel, and the industry is working hard to increase that percentage over time.
The advantages are:
Generates a large amount of electricity
No production of greenhouse gases
Dependence on oil is reduced
Less damage to the environment
A major disadvantage is the difficult management of the nuclear waste generated.
Nuclear power plants have a limited lifetime. The investment for the construction of a nuclear plant is very high.
true or false the offspring produced by asexual reproduction are genetically identical to their parents.
Answer:
True
Explanation:
Choose all the right answers. Animals cells do not need:
a cell membrane
chloroplasts
a cell wall
a nucleus
Answer:
chloroplasts and cell wall
Explanation:
These are only found in plant cells.
Why do these scientists use bioluminescence in their “superbugs? In this particular lab, how can they tell if the cells aren’t alive anymore?
Answer:
Not entirely positive but I do know that bioluminescence is a natural substance found in many living creatures and it makes them glow. They could be testing products for ideas of what undiscovered life is on earth. But all I do know is bioluminescence is an ingredient that causes things to glow.
Explanation:
Bioluminescence refers to a living thing that produces and emits light. Glow-in-the-dark animals can be found in all marine ecosystems, including those at the ocean's surface and deepest depths.
What is bioluminescence?Utilizing bioluminescent bacteria, they can swiftly determine the quantity of bacteria present and end the experiment much more quickly, resulting in less pain, a shorter experiment duration, and the usage of fewer animals.
Current applications of the bioluminescence reaction include gene assays, the detection of protein-protein interactions, high-throughput screening (HTS) for drug development, hygienic monitoring, the assessment of environmental contamination, and in vivo imaging of tiny mammals.
To learn more about Bioluminescence refer to:
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which of the following is NOT true about evolution? NO LINKS
A. it is necessary for a population to survive
B. it results from environmental changes
C. large populations are affected more than
small populations
D. individuals moving into or out of the
population cause evolution.
Answer:
A
Explanation:
It can help a population to survive but it is not necessary.
Zebras spend a lot of time traveling in search of grass to eat. It is dark out, and this zebra is not eating. What is happening to the carbon in the air around the zebras and the grass nearby?
Answer:
The carbon is moving into the air
Explanation:
Since the zebra is not eating, the carbon is only moving into the air and not out of the air
Good morning, can someone please help me ? Thanks
Answer:
Mitochondria.
Hope this helps.
Explanation:
Answer:
Cell Wall
Explanation:
The cell wall is a layer, that is non-living, and is part of a plant cell.
Let me know if you want me to explain more, hopefully that helps and have a great day!
When is it possible to break even in an energy transformation
A: Always
B: Late phase
C: Early Phase
D: Never
which statement best describes the relationship between an alleles frequemcy and its dominance
Answer:
Frequency results from environmental stresses, not dominance.
Which word describes a slope in biology?
Answer:
Concentration Gradient
PLEASE HELP ILL GIVE BRAINLEST
Cyanobacteria, also known as blue-green algae, are a kind of bacteria found in many lakes. These organisms make their own food through photosynthesis. Small animals including mayfly larvae eat the cyanobacteria, and small fish such as yellow perch eat the larvae. The small fish provide food for larger fish, such as walleye.
Describe a model you could use to show the transfer of energy within the lake ecosystem. In your description of your model, make sure you include the position of each organism identified in the paragraph.
Answer:
Cyanobacteria are aquatic and photosynthetic, that is, they live in the water, and can manufacture their own food. Because they are bacteria, they are quite small and usually unicellular, though they often grow in colonies large enough to see. They have the distinction of being the oldest known fossils, more than 3.5 billion years old, in fact! It may surprise you then to know that the cyanobacteria are still around; they are one of the largest and most important groups of bacteria on earth.
Many Proterozoic oil deposits are attributed to the activity of cyanobacteria. They are also important providers of nitrogen fertilizer in the cultivation of rice and beans. The cyanobacteria have also been tremendously important in shaping the course of evolution and ecological change throughout earth's history. The oxygen atmosphere that we depend on was generated by numerous cyanobacteria during the Archaean and Proterozoic Eras. Before that time, the atmosphere had a very different chemistry, unsuitable for life as we know it today.
The other great contribution of the cyanobacteria is the origin of plants. The chloroplast with which plants make food for themselves is actually a cyanobacterium living within the plant's cells. Sometime in the late Proterozoic, or in the early Cambrian, cyanobacteria began to take up residence within certain eukaryote cells, making food for the eukaryote host in return for a home. This event is known as endosymbiosis, and is also the origin of the eukaryotic mitochondrion.
Because they are photosynthetic and aquatic, cyanobacteria are often called "blue-green algae". This name is convenient for talking about organisms in the water that make their own food, but does not reflect any relationship between the cyanobacteria and other organisms called algae. Cyanobacteria are relatives of the bacteria, not eukaryotes, and it is only the chloroplast in eukaryotic algae to which the cyanobacteria are related.
Explanation:
What in the cell carries genetic
information?
Answer:
chromosomes
Explanation:
Write a 3-5 sentence summary. Looking back at the central question, what do you think would happen to a skeleton if paleontologists were not careful with how they combined the fossils they found to re-create an animal’s skeleton? Explain which parts of your hypothesis were correct or incorrect. What did this experiment reveal about God or His creation?
Answer:
Fossils are the preserved remains or traces of animals, plants, and other organisms from the past. Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today.Explanation:
Which organic molecules are present in milk?
Answer:
Explanation:
The principal constituents of milk are water, fat, proteins, lactose (milk sugar) and minerals (salts). Milk also contains trace amounts of other substances such as pigments, enzymes, vitamins, phospholipids (substances with fatlike properties), and gases.
which of the following best describes the conditions on earth over 4 bilion years ago?
Answer:
Based on the very old zircon rock from Australia we know that the Earth is at least 4.374 billion years old.
How would a dislodged piece of plaque in the cardiovascular system most likely affect an otherwise healthy person?
A: The right pulmonary artery could become blocked, restricting blood flow to the right lung.
B: narrow region of the superior vena cava could become blocked, restricting blood flow to the heart.
C: smaller artery in a leg could become blocked, restricting blood flow to capillaries in the leg.
D: narrow vein in the brain could become blocked, restricting blood flow to capillaries in the brain.
You must explain your answer
Answer:
pulmonary artery could become blocked.
Explanation:
The right pulmonary artery could become blocked, restricting blood flow to the right lung. A narrow region of the superior vena cava could become blocked, restricting blood flow to the heart.
What is the experiment for iodine test on starch? Step by step.
Answer:
Explanation: SOLID SAMPLE :
1. Peel off the skin of any vegetables e.g. potato and fruits as these are often impermeable. Use a clean spatula to remove samples of powdered food. Avoid cross-contamination with other foods.
2. Add a few ( 2-3) drops of bench iodine solution potassium to a piece of solid food on a white tile.
3.Make observations.
LIQUID SAMPLE:
1. Add 10 cm3 of the liquid food sample to a clean, dry test tube.
2.Add about 5 drops of iodine solution to the test tube.
3.Note any colour changes.
4.To prepare a control, perform steps 1 -3 for de-ionized water.
Glucose enters the cell through which of the following mechanism?
Select one:
a. Facilitated diffusion
b. Central pathways
c. ATP binding cassette transport
d. Feeder pathways
e. Phosphotransferase system
Answer:
a. facilitated diffusion
Explanation:
Instead, cells assist glucose diffusion through facilitated diffusion and two types of active transport.
A person has floppy, unattached earlobes. This is a trait caused by a single gene (monogenetic). Having floppy earlobes is a dominant trait. If the letter E represents one allele, which of the following could be the genotype of this floppy-eared individual?
EE
Ee
ee
EE , Ee , and ee are all possible genotypes .
EE and Ee are possible genotypes , but not ee ..
True or False: Most asteroids are found floating freely
throughout the solar system.
Answer:
True
Explanation:
As they revolve around the Sun in elliptical orbits, the asteroids also rotate, sometimes quite erratically, tumbling as they go. More than 150 asteroids are known to have a small companion moon (some have two moons).
pls mark brainliest if I'm correct
At what site on the enzyme are reactants brought together
during a chemical reaction?
Explanation:
Enzymes bring reactants together so they don't have to expend energy moving about until they collide at random. Enzymes bind both reactant molecules (called the substrate), tightly and specifically, at a site on the enzyme molecule called the active site
The site on the enzyme at which reactants are brought together during a chemical reaction is known as the active site.
What are Enzymes?Enzymes may be defined as biocatalysts that increase the rate of a chemical reaction without being consumed or changed in the overall process. It may be thought that all cellular reactions and processes are mediated by enzymes.
The construction of the enzyme-substrate complex is the first step in the mechanism of enzymatic catalysis. In this step, the reactant molecules are brought together during a chemical reaction. These reactant molecules bind to the active site of an enzyme.
The Active site of an enzyme is the region where substrates bind and catalysis initiates.
Therefore, the active site is the region on the enzyme at which reactants are brought together during a chemical reaction.
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what can be used to detect fermentation in yeast ?
Answer:
methylene blue
I hope this help
Answer:
The rate of fermentation can be measured by placing a small amount of yeast and sugar solution in a fermentation tube.
Explanation:
Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes
A researcher conducts an investigation on fiddler crabs to understand the importance of claw size in mating. Male fiddler crabs have one normal-sized claw and one giant claw that they wave to attract female fiddler crabs. The female fiddler crabs have two small, same-sized claws. The researcher places 15 male crabs with different sized claws into an enclosure with similar conditions similar to their natural habitat. The researcher then releases 15 female crabs into the enclosure. The graph shows the percentage of male crabs of different claw size that successfully mated for three successive trials.
Answer:
The Answer is B
Explanation:
I got it right on USA TEST PREP
Which choice is correct?
Answer:
B is the correct answer
Mercury's iron core takes up a majority of the planet's radius,
which plays a role in the planet's density.
TRUE
FALSE
Answer:
I think false sorry if wrong