Question

cellular respiration
multiple choice
releases energy and reduces water.
oxidizes glucose and reduces oxygen.
requires energy and releases nadh.
releases energy and oxygen.
oxidizes oxygen and reduces glucose.

Explanation:

Cellular respiration is a metabolic process. In this process, glucose (\(C_6H_{12}O_6\)) is oxidized. The overall equation for aerobic cellular respiration is \(C_6H_{12}O_6+6O_2
ightarrow6CO_2 + 6H_2O+\text{Energy}\). Oxygen (\(O_2\)) acts as the final electron acceptor. When it accepts electrons, it is reduced.

Let's analyze each option:

• Option 1: Cellular respiration produces water (\(H_2O\)) as a product (not reduces water). So this option is incorrect.
• Option 2: Glucose (\(C_6H_{12}O_6\)) is oxidized (\(C_6H_{12}O_6

ightarrow6CO_2\)) and oxygen (\(O_2\)) is reduced (\(O_2
ightarrow H_2O\)). This option is correct.

• Option 3: Cellular respiration releases energy (in the form of ATP). It does not require energy in the overall process (glycolysis has an initial ATP investment, but the net is energy - release). Also, NADH is an intermediate electron - carrier produced, not just released. So this option is incorrect.
• Option 4: Cellular respiration consumes oxygen (\(O_2\)) (as a reactant), not releases it. So this option is incorrect.
• Option 5: Oxygen is reduced (not oxidized) and glucose is oxidized (not reduced) in cellular respiration. So this option is incorrect.

Answer:

oxidizes glucose and reduces oxygen.