Question

what do all cellular activities in living organisms use as a source of energy?
○ atp
○ lactic acid
○ pyruvic acid
○ carbon dioxide

Explanation:

• ATP (adenosine triphosphate) is the energy currency of cells. All cellular activities in living organisms use ATP as a source of energy.
• Lactic acid is a by - product of anaerobic respiration, not an energy source for cellular activities.
• Pyruvic acid is an intermediate in cellular respiration, not the direct energy source for all cellular activities.
• Carbon dioxide is a by - product of respiration and is used in photosynthesis, not as an energy source for cellular activities.

Answer:

A. ATP