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Question

Match the compounds given in Column I with the number of carbon atoms present in them which are listed under Column II. Choose the answer which gives the correct combination of alphabets of the two columns.

Column I
Column II
A. Oxaloacetate
(p) 6- C compound
B. Phosphoglyceraldehyde
(q) 5- C compound
C. Isocitrate
(r) 4- C compound
D. a-Ketoglutarate
(s) 3- C compound

(t) 2- C compound

A
A- s, B- t, C- q, D- r
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B
A- r, B- s, C- p, D- q
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C
A- r, B- t, C- p, D- q
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D
A- q, B- s, C- p, D- t
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Solution

The correct option is C A- r, B- s, C- p, D- q
The citric acid cycle begins with the transfer of a two-carbon acetyl group from acetyl-CoA to the four-carbon acceptor compound (oxaloacetate) to form a six-carbon compound (citrate).
Phosphoglyceraldehyde is the breakdown of one molecules of glucose which becomes two PGAL with 3 carbon atoms and 1 phosphate each. Isocitrate dehydrogenase (IDH) is an important enzyme in the tricarboxylic acid cycle, which occurs in the mitochondrial matrix.
IDH is responsible for catalyzing the reversible conversion of isocitrate to alpha-ketoglutarate and CO2 in a two-step reaction.
α-Ketoglutarate is a key intermediate in the Krebs cycle, coming after isocitrate and before succinyl CoA.

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