Question

During energy payoff phase: 2 Glyceraldehyde-3-P + 4 ADP + 2 Pi + 2 NAD+ -->

A) 2 Pyruvate + 2 ATP + 2 NADH
B) 2 Pyruvate + 4 ATP + 2 NADH
C) 2 Pyruvate + 2 ADP + 2 Pi + 2 NADH
D) 2 Pyruvate + 4 ADP + 4 Pi + 4 NAD+

Answer 1

The correct answer is Option B: 2 Pyruvate + 4 ATP + 2 NADH, which is the outcome of the energy payoff phase in glycolysis where ATP and NADH are produced. the correct option is B) 2 Pyruvate + 4 ATP + 2 NADH.

Step-by-step explanation:

The correct answer to the given question regarding the energy payoff phase of glycolysis is that for every 2 molecules of Glyceraldehyde-3-phosphate, there is a production of 2 pyruvate, 4 ATP, and 2 NADH. This can be written as:

2 Glyceraldehyde-3-P + 4 ADP + 2 Pi + 2 NAD+ --> 2 Pyruvate + 4 ATP + 2 NADH

This energy payoff phase is crucial as it represents the phase where energy is harvested from the reactions of glycolysis. The enzyme glyceraldehyde-3-phosphate dehydrogenase starts this process, which leads to the formation of NADH and ATP, molecules essential for cellular processes. This phase forms the backbone of cellular respiration, where ATP is generated as a direct source of energy for the cell, and NADH will be used later in the mitochondria during oxidative phosphorylation to produce even more ATP. Therefore, the correct option is B) 2 Pyruvate + 4 ATP + 2 NADH.