First slide

Aerobic Respiration

Question

What is the role of NAD+ in cellular respiration?

Moderate

A

It functions as an enzyme
B

It functions as an electron carrier
C

It is a nucleotide source for ATP synthesis
D

It is the final electron acceptor for anaerobic respiration.

Solution

In cellular respiration, NAD+ functions as an electron carrier. NAD+ is also referred to as coenzyme 1. It plays a key role in energy metabolism by accepting and donating electrons. The low energy form NAD+ is raised to the high energy form NADH. It accepts two electrons and a hydrogen in reaching the high energy state. The NAD+ is used in redox reactions in the cell and acts as a reducing agent. NADH contributes to oxidation in cell processes like glycolysis to help with the oxidation of glucose.

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