Question

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

• A. Krebs cycle and Calvin cycle
• B. Tricarboxylic acid cycle and citric acid cycle
• C. Citric acid cycle and Calvin cycle
• D. Tricarboxylic acid cycle and urea cycle

Answer 1

The correct option is B Tricarboxylic acid cycle and citric acid cycle

The citric acid cycle also known as the tricarboxylic acid cycle (TCA cycle), or the Krebs cycle is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats and proteins into carbon dioxide and chemical energy in the form of adenosine triphosphate (ATP).
The Calvin cycle is a metabolic pathway found in the stroma of the chloroplast in which carbon enters in the form of CO2CO2 and leaves in the form of sugar. Calvin cycle is not called as Krebs cycle or citric acid cycle.
The urea cycle or the ornithine cycle describes the conversion reactions of ammonia into urea. Urea cycle is not called as tricarboxylic acid cycle.

Thus, the correct answer is option B.