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Charra [1.4K]
3 years ago
7

Is urea cycle reversible?

Biology
1 answer:
steposvetlana [31]3 years ago
7 0

Explanation:

The mitochondrial form of the enzyme is distinct from the cytosolic (II) form, which has a separate function in pyrimidine biosynthesis. The carbamoyl phosphate, which functions as an activated carbamoyl group donor, now enters the urea cycle. ... This is the only reversible step in the urea cycle.

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In the lac operon, the repressor:a. binds to allolactose and becomes active, blocking lac gene expression.b. binds allolactose a
Vladimir79 [104]

Answer:

c. binds to allolactose and becomes inactive, allowing lac gene expression to occur.

Explanation:

Interaction between allolactose and repressor leads to allosteric repulsion which makes repressor inactive leading to the lac gene expression. This is the reason why allolactose is known as the inducer of lac operon becasue it causes gene expression in lac operon.

In the absence of allolactose, the repressor binds the operator and does not allow RNA polymerase to do transcription.

3 0
4 years ago
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Answer:

The correct answers are-

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As the size of a cell increases the surface area to volume ratio decrease. So a big cell has less surface area and small volume. Therefore surface area for transfer of metabolic substance per unit volume decreases so the cell's ability to transport enough nutrients in and transport wastes out to meet cellular metabolic demands also decreases.

But due to an increase in the volume of the cell the metabolic demand of cell increases because a larger cell requires more nutrients than a smaller cell to survive which can not be fulfilled efficiently due to less surface-area-to-volume ratio.

Therefore the correct answer is a, b, and c.

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