Question

multiple choice
listen
what molecule do cells use as an energy source to recharge an adp into an atp?
a glucose
b phosphate
c carbon dioxide
d oxygen
attempt 1 of 2 submit

Explanation:

To determine the molecule cells use to recharge ADP to ATP, we analyze each option:

• Option A: Glucose is broken down in cellular respiration to release energy, but it's not the direct molecule for recharging ADP. However, the energy from glucose metabolism is used to add a phosphate group to ADP. Wait, no—actually, the direct molecule to convert ADP to ATP is by adding a phosphate group. Wait, no, let's correct. The process of ADP + Pi (inorganic phosphate) + energy → ATP. But the energy source to drive this phosphorylation (recharging ADP to ATP) comes from the oxidation of glucose (or other energy - rich molecules) in cellular respiration. But among the options, glucose is the primary energy - yielding molecule that provides the energy needed for the phosphorylation of ADP. Wait, no, the question is about the molecule used as an energy source to recharge ADP to ATP. Wait, maybe I made a mistake earlier. Let's re - evaluate:
• Option B: Phosphate (Pi) is the molecule that is added to ADP to form ATP, but it's not the energy source. The energy source is needed to drive the reaction ADP + Pi → ATP.
• Option C: Carbon dioxide is a by - product of cellular respiration, not an energy source for recharging ADP.
• Option D: Oxygen is the final electron acceptor in aerobic respiration, not an energy source for recharging ADP.

Glucose is oxidized in cellular respiration, and the energy released is used to phosphorylate ADP (add a phosphate group to ADP) to form ATP. So glucose is the molecule (as an energy - yielding molecule) that provides the energy to recharge ADP to ATP.

Answer:

A. glucose