Question

which phase of glycolysis requires an investment of atp?
energy investment phase
energy payoff phase
oxidative phosphorylation
citric acid cycle

Explanation:

Glycolysis has two main phases: the energy investment phase and the energy payoff phase. In the energy investment phase, ATP is used (invested) to phosphorylate glucose and its intermediates, preparing them for the later steps where ATP is produced. The energy payoff phase produces ATP. Oxidative phosphorylation and the citric acid cycle are parts of cellular respiration but not glycolysis phases that involve ATP investment.

Answer:

A. energy investment phase