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HACTEHA [7]
3 years ago
14

How are electrons lost replaced in photosystem II?

Biology
1 answer:
timofeeve [1]3 years ago
4 0

Answer:

Water is split to yield two electrons, with oxygen and two hydrogen ions as by-products.

Explanation:

The electron lost from the reaction center is replaced with an electron that comes from water. When two water molecules are split, four electrons and four protons are released.

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Suppose that a certain gene functions to enforce a checkpoint on the cell cycle. A mutation causing the loss of this gene's func
chubhunter [2.5K]

Answer:

The correct answer is C. be more likely to have cancer at some point in his/her life.

Explanation:

Cell cycle checkpoints are controlled by different proteins which are coded by different genes. They are important in cell cycle regulation and stops cell cycle immediately if they find any problem in the cell like mutation.

The cell cycle will not be continued if the problem does not solve and cell death will occur which prevents cancer by preventing the mutation to spread into new cells.  

Therefore if a mutation occurs in certain genes that enforce a checkpoint on the cell cycle then the mutated gene will pass in new cells and the mutated cells will grow uncontrollably due to no checkpoints so the person will probably have cancer at some point in his or her life.

7 0
3 years ago
Helppppp boooo!!!!!
8090 [49]

By the first distance, I'd say Venus (0.72 AU)

By the second distance, I'd say it's Saturn (9.54 AU)

But you also say it has no visible rings so the answer is VENUS.

Hope it helped,

Happy homework/ study/ exam!

3 0
3 years ago
Read 2 more answers
If water is polar, state a liquid that you think is nonpolar, and justify your answer
Nata [24]
A gas. This is because none polar solvents contain binds between atoms with similar electronegativities, some examples are carbon and hydrogen
7 0
3 years ago
Hemoglobin is the protein that transports oxygen in mammals. Different species of mammals have slightly different forms of hemog
slavikrds [6]

Answer:

The correct answer is - 6.8950.61 gm per mole

Explanation:

Given:

One form of hemoglobin is 0.324% Fe by mass

1 hemoglobin = 4 Fe

Solution:

Molar Mass of iron = 55.85

mass of 4 iron atom = 55.85 * 4 = 223.4 gms

0.324 % correspond to 223.4 gms

100 % correspond to = 223.4 *100/0.324

= 68950.61 gm

MM of haemoglobin = 68950.61 gms = 6.8 E4 gms

6 0
3 years ago
Haploid spores are produced in what of a moss​
Amanda [17]

Answer:

sporangium! :)

7 0
3 years ago
Read 2 more answers
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