Diffusion of oxygen from an alveolus into a pulmonary capillary belongs to which aspect of respiration?

DNA contains the template needed to copy itself, but it has no catalytic activity in cells. What catalyzes the formation of phos

inna [77]

Answer:

DNA polymerases

Explanation:

The formation of a phosphodiester bond between adjacent nucleotides is catalyzed by the DNA polymerases. They do this efficiently only if the incoming base on the incoming nucleoside triphosphate is complementary to the base on the template strand and can bind efficiently.

4 0

2 years ago

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How have scientists determined the earth's core is composed of iron and nickel?

Sedaia [141]

The correct option from the given options is: "Scientist have determined the composition of Earth's core by using radiometric dating to examine meteorites".
To date materials the procedure of radiometric dating or radioactive dating is used, for example, rocks or carbon, in which trace radioactive impurities were specifically fused when they were framed. The strategy looks at the abundance of a normally happening radioactive isotope inside the material to the abundance of its decay items, which shape at a known consistent rate of decay.

8 0

3 years ago

What is the temperature, in degrees Celsius, of a substance with a temperature of 49K?

Leviafan [203]

49 Kelvin = -224.15 Celsius

I believe this is the answer.

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2 years ago

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4. Which pathway represents the flow of electrons during photosynthesis? (1 point) A.) H2O > Photosystem I > Photosystem I

Yuki888 [10]

Answer:

4. The correct pathway for the flow of electron during photosynthesis is mentioned in option D. $H_{2}O$ > NADP > Calvin cycle.

Electron is first provided to the photo-system II by the phtolysis of water.
Then it is passed to photo-system I with the help of plastoquinone (PQ) and cytochrome $b_{6}f$ .
Finally, electron from the photo-system II is used to reduce NADP to NADPH.
NADPH and ATP are used in light independent phase or Calvin cycle to synthesize carbohydrate from carbon dioxide.

5. The correct answer is B.) photosynthesis.

Photosynthesis is the process by which green plants synthesize glucose or carbohydrate from carbon dioxide and water in presence of sunlight and chlorophyll.
In light independent phase of photosynthesis, it requires ATP and NADPH in order to synthesize food.
Lastly, oxidation or breaking down of glucose releases energy and photosynthesis is a anabolic process instead of catabolic one.

4 0

3 years ago

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Which of these best describes extinction events?

SpyIntel [72]

Answer: D. Extinctions occur at higher rates during times of ecological stress when populations and species are poorly adapted.

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2 years ago

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