Question

1. which molecule stores energy that the cell can use directly?

a. atp
b. dna
c. glucose
d. co₂

Explanation:

To determine the molecule that stores energy the cell can use directly, we analyze each option:

• Option a (ATP): Adenosine Triphosphate (ATP) is the immediate energy currency of the cell. When its high - energy phosphate bonds are broken, energy is released and can be directly used by the cell for various metabolic processes.
• Option b (DNA): Deoxyribonucleic Acid (DNA) is the genetic material of the cell. It stores genetic information, not energy for direct cellular use.
• Option c (glucose): Glucose is a source of energy, but the energy in glucose needs to be converted into ATP through cellular respiration before the cell can use it. So it is not the direct energy source.
• Option d ($\ce{CO_2}$): Carbon Dioxide ($\ce{CO_2}$) is a by - product of cellular respiration and does not store energy for the cell to use.

Answer:

a. ATP