Ques. 1AIPMT 2004
In glycolysis, during oxidation electrons are removed by
- ATP
- glyceraldehyde-3-phosphate
- NAD+
- molecular oxygen.
Answer
(3) NAD+
Solution
As per NCERT, in glycolysis 3-phosphoglyceraldehyde (PGAL) is oxidised and phosphorylated to 1,3-bisphosphoglyceric acid (BPGA).
⇒ In this step two redox-equivalents (electrons with H+) are removed from PGAL and transferred to NAD+.
NAD+ + 2e- + 2H+ NADH + H+
∵ Glycolysis is anaerobic, molecular oxygen is not the electron acceptor; glyceraldehyde-3-phosphate is the substrate that loses electrons.
∴ Electrons are removed by NAD+.
Answer: (3)