Question

At the end of glycolysis, X is the net energy gain from one molecule of glucose via Y, but there is also energy stored in the form of Z. Identify X, Y and Z

• A.

  X	Y	Z
  1 ATP	Oxidative phosphorylation	$NADH+H^{+}$

• B.

  X	Y	Z
  2 ATPs	Oxidative phosphorylation	$NADH+H^{+}$

• C.

  X	Y	Z
  1 ATP	Substrate level phosphorylation	$FADH+H^{+}$

• D.

  X	Y	Z
  2 ATPs	Substrate level phosphorylation	$NADH+H^{+}$

Answer 1

Answer: (D)

Glycolysis is a catabolic process where the substrate glucose is broken down into smaller molecules- pyruvic acid. It occurs anaerobically. The site for glycolysis is the cytoplasm. It is a stepwise process involving a series of ten enzymes to catalyse the processes.
ATP obtained from ADP and a phosphorylated intermediate instead of inorganic phosphate, Pi, is referred to as substrate-level phosphorylation. This process is observed in the glycolysis and the amount of ATP generated is relatively low. The net result of glycolysis is 2 ATP with 2 NADH₂.