Question

Identify the CORRECT combination(s) between the enzymes in Group 1 and the reactions in Group 2 they catalyze. 
 

• A. ( {S - iv} )
• B. ( {Q - ii} )
• C. ( {P - i} )
• D. ( {R - iii} )

Hint:

Enzyme-substrate specificity is crucial in biochemical pathways. Familiarize yourself with key enzymes and their associated reactions for accurate interpretation.

Answer 1

The Correct Option is A

The correct combination between the enzymes in Group 1 and the reactions in Group 2 is as follows: 
- S - Nitrate reductase (iv): This enzyme catalyzes the reduction of nitrate (( {NO}_3^- )) to nitrite (( {NO}_2^- )) using NAD(P)H as the electron donor. Hence, ( {S - iv} ) is correct.
Incorrect combinations: - P - Cinnamate-4-hydroxylase (i): This reaction involves {cinnamic acid hydroxylation}, not the conversion of L-phenylalanine to cinnamic acid. 
- Q - Glycerate kinase (ii): Glycerate kinase phosphorylates glycerate, not glyceraldehyde 3-phosphate. 
- R - PEP carboxylase (iii): PEP carboxylase catalyzes the conversion of phosphoenolpyruvate to oxaloacetate, not glycolate to glyoxylate. Thus, the correct answer is ( {(A) S - iv} ).