Question

Study the pathway given above.
In which of the following options correct words for all the three blanks a, b and c are indicated.

• A. a - Decarboxylation, b - Reduction, c - Regeneration
• B. a - Fixation, b - Transamination, c - Regeneration
• C. a - Fixation, b - Decarboxylation, c - Regeneration
• D. a - Carboxylation, b - Decarboxylation, c - Reduction

Answer 1

The correct option is C a - Fixation, b - Decarboxylation, c - Regeneration

A) 'a' refers to the fixation of atmospheric carbon dioxide. So, a - fixation.
B) 'b' refers to the decarboxylation of the $C_4$ acid to form a three carbon molecule, releasing carbon dioxide. So, b - decarboxylation.

C) 'c' refers to the regeneration of PEP from carbon dioxide and $C_3$ acid. So, c - regeneration.
D) a - Fixation, b - Decarboxylation, c - Regeneration.
So the correct answer is 'a - Fixation, b - Decarboxylation, c - Regeneration'.