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Question

In which one of the following do the two names refer to one and the same thing:


A

Krebs cycle and Calvin cycle

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B

Tricarboxylic acid cycle and citric acid cycle

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C

Citric acid cycle and Calvin cycle

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D

Tricarboxylic acid cycle and urea cycle

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Solution

The correct option is B

Tricarboxylic acid cycle and citric acid cycle


TCA or tricarboxylic acid is the first stable compund formed in the Krebs cycle. Hence, Krebs cycle is also know as TCA cycle.
Tricarboxylic acid is also commonly known as citric acid. Hence, another name for Krebs cycle is also Citric acid cycle.
Hence, both TCA cycle and Citric acid cycle are one and the same and are alternate names of Krebs cycle.
Krebs cycle is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA into carbon dioxide.
Calvin cycle is a set of reactions that takes place in chloroplasts during photosynthesis.
Urea cycle, also know ornithine cycle, converts excess ammonia into urea in the mitochondria of liver cells.


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