Question

According to your text, glycolysis is divided into three phases. In which phase of glycolysis is ATP not generated?

A) 1
B) 2
C) 3
D) 1 and 2
E) 1, 2, and 3

Answer 1

ATP is not generated in the first phase of glycolysis, which is known as the energy-consuming or priming phase. The correct answer is A) 1. The second phase of glycolysis is the energy-yielding phase where ATP is produced.

Step-by-step explanation:

In glycolysis, ATP is not generated in the first phase; instead, it is actually consumed. The first phase is known as the energy-consuming or priming phase, which requires an input of energy in the form of 2 ATP molecules per glucose molecule. Therefore, the correct answer to the question 'In which phase of glycolysis is ATP not generated?' is A) 1.

The second phase of glycolysis, called the energy-yielding phase, is where ATP is generated. During this phase, 4 molecules of ATP are produced per molecule of glucose, resulting in a net gain of two ATP molecules. Specifically, 1,3-Bisphosphoglycerate (BPG) is dephosphorylated by phosphoglycerate kinase to yield ATP and 3-Phosphoglycerate (3-PG), contributing to ATP synthesis in this phase.