Question:easy
The coenzyme form of pyridoxine (vitamin B6) is?
The coenzyme form of pyridoxine (vitamin B6) is?
Show Hint
Vitamin B6 must be phosphorylated to become active; think pyridoxal phosphate.
Updated On: Jun 24, 2026
- ADP
- NAD
- PLP
- FAD
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Match each coenzyme to its parent vitamin. ADP is a nucleotide and is not a vitamin coenzyme. NAD is made from niacin. FAD is made from riboflavin.
Step 2: Vitamin B6 (pyridoxine) becomes active only after phosphorylation by pyridoxal kinase, yielding pyridoxal 5-phosphate (PLP).
Step 3: PLP forms a Schiff base with amino acid substrates, which is why it is central to aminotransferase, decarboxylase, and many other amino acid enzymes. By elimination, PLP is the correct B6 coenzyme.
\[\boxed{\text{PLP (pyridoxal 5-phosphate)}}\]
Step 2: Vitamin B6 (pyridoxine) becomes active only after phosphorylation by pyridoxal kinase, yielding pyridoxal 5-phosphate (PLP).
Step 3: PLP forms a Schiff base with amino acid substrates, which is why it is central to aminotransferase, decarboxylase, and many other amino acid enzymes. By elimination, PLP is the correct B6 coenzyme.
\[\boxed{\text{PLP (pyridoxal 5-phosphate)}}\]
Was this answer helpful?
0
