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boyakko [2]
2 years ago
8

The textbook the quantum efficiency for photosynthesis decreases abruptly when the wavelength of light being used becomes longer

the 680 nm. Which ONE of the following is the explanation for this "red drop"?
A. The reactions that extract electrons from water to make O2 take place in the photosystem that is activated by 680 nm light.
B. Red light inhibits photosynthesis.
C. Photosystem I requires 680 nm light
D. Red light is absorbed CO2 to initate the synthesis of carbohydrates.
Biology
1 answer:
Elis [28]2 years ago
6 0

Answer:

The correct answer will be option- A

Explanation:

Red drop effect is the effect observed by the light present in the spectrum of the wavelength of red light. The effect is observed with the decrease in the quantum yield of the oxygen formed per quantum of light when the wavelength of light exceeds 680 nm.

The decrease of quantum yield is observed due to the fact that the oxygen is formed by the breakdown of the water molecule during light-dependent reaction which is initiated by the PS II which begins the chain at 680nm.

If light exceeds the 680 nm then, PS II will remain inactive and thus will abrupt the dissociation of the water molecule and thus the formation of oxygen during the light-dependent phase.

Thus, option-A is the correct answer.

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What would be the most likely effect on the transcription of the trp structural genes for the mutation scenarios provided? mutat
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Answer:

I've responded to each scenario individually, please see below:

1. mutation that prevents ribosome binding to the mRNA

No transcription occurs

2. 5' UTR mutation that changes region 1 tryptophan codons into alanine codons

Transcription when alanine is low

3. mutation that creates a stop codon in region 1 of mRNA 5' UTR

Transcription occurs, a truncated protein will be made during translation

4. deletions in region 2 of the mRNA 5' UTR

Transcription occurs, region 1 and 2 might get paired together

5. deletions in region 3 of the mRNA 5' UTR

Transcription occurs, region 3 and 4 could combine to form a hairpin loop structure

6. deletions in region 4 of the mRNA 5' UTR

Transcription occurs, region 3 and 4 could combine to form a hairpin loop structure

7. deletion of the string of adenine after region 4 of the mRNA 5' UTR

Transcription occurs, however, it will not be as stable a molecule because of losing its polyA tail

Hope that answers the question, have a great day!

6 0
3 years ago
Read 2 more answers
Is corn a lipid or carbohydrates
Alborosie

Answer:

yes

Explanation:

it's a fatty

4 0
3 years ago
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Pls help i need it asap will make brainiest<br> How is pressure affected as depth increases?
ElenaW [278]
The pressure is increased as depth increases.
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3 0
3 years ago
Suppose molecules were unable to diffuse into and out of the cells. How might life be different if cells had to use active trans
antiseptic1488 [7]

Answer:

Cells would most probably not exist because these units of life metabolize energy molecules like glucose to harness their energy for the running of biochemical processes, like active transport, to support life. However, harnessing this energy from these energy molecules is NOT 100 percent efficient. A higher percentage of energy is lost as heat in the process.

Therefore if the cells were required to carry all molecules in and out of the cell, actively, including the energy molecules themselves (which is counterintuitive), this would require a lot of energy and would be unsustainable. This would be analogical to the counteracting and infinite loop of more fuel needed to carry the mass of the more fuel in space travel...

Learn More:

To learn more about the movement of molecules across the cell check out;

brainly.com/question/6169784

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#LearnWithBrainly

8 0
3 years ago
Pls help me guys ;) you guys are talented and amazing :)
steposvetlana [31]
Answer c is correct great job


7 0
3 years ago
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