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Polyembryony

Conversion of...

Question

Conversion of ammonia to urea is done by ________ cycle?

A

ornithine

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B

citrulline

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C

arginine

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D

fumeric

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Solution

The correct option is A
ornithine

The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions occurring in many animals that produces urea((NH₂)₂CO) from ammonia (NH₃).

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Q. Which of these statements are true regarding urea cycle?
1. Fumarate acts as a connecting link between urea cycle and Krebs cycle.2. Urea cycle solely occurs in mitochondria only.3. Citrulline and arginine reacts to form argininosuccinate.4. Ornithine formed in the last reaction is directly excreted along with urea.5. Arginase promotes cleavage of arginine to urea and ornithine.

Q. Which of the following steps are ATP dependent in urea cycle?
I. Combination of ammonia and

C O_{2}

II. Conversion of ornithine to citrulline
III. Reaction of citrulline with aspartate
IV. Formation of urea

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