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Excretory Products and Their Elimination

Ornithine is ...

Question

Ornithine is converted into citrulline by the enzyme

A

Glutamic dehydrogenase

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B

Aspartic glutamic transaminase

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C

Carbamyl phosphate synthetase

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D

Ornithine carbamoyl transferase

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Solution

The correct option is D Ornithine carbamoyl transferase
Ornithine transcarbamylase (OTC) (also called ornithine carbamoyl transferase) is an enzyme that catalyzes the reaction between carbamoyl phosphate (CP) and ornithine to form citrulline and phosphate.

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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

H_{3} P O_{4}

formed is converted into calcium phosphate by treating with

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mole of calcium hydroxide. Calcium phosphate obtained is :

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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