Question

select the correct answer.
what is the primary biomolecule that cells use for energy?
a. atp
b. glucose
c. nadh
d. nadph
e. oxygen

Explanation:

To determine the primary biomolecule cells use for energy, we analyze each option:

• Option A (ATP): Adenosine Triphosphate (ATP) is the immediate energy currency of cells. When its high - energy phosphate bonds are broken, energy is released for cellular processes.
• Option B (glucose): Glucose is a source of energy, but cells break down glucose (through processes like cellular respiration) to produce ATP. So glucose is not the direct, primary energy - using biomolecule.
• Option C (NADH): NADH is an electron carrier in cellular respiration. It transfers electrons to the electron transport chain to help generate ATP, but it is not the primary energy - using molecule.
• Option D (NADPH): NADPH is mainly involved in anabolic reactions (like photosynthesis in plants) and is not the primary energy - using biomolecule for general cellular work.
• Option E (oxygen): Oxygen is the final electron acceptor in aerobic respiration. It is essential for efficient ATP production but is not an energy - using biomolecule.

Answer:

A. ATP