Question

The four stages of cellular respiration do not function independently. Instead, they are coupled together because one or more outputs from one stage functions as an input to another stage. The coupling works in both directions, as indicated by the arrows in the diagram below. In this activity, you will identify the compounds that couple the stages of cellular respiration.

Drag the labels on the left onto the diagram to identify the compounds that couple each stage. Labels may be used once, more than once, or not at all.
a. pyruvate
b. NADH
c. NAD⁺
d. NADH
e. NAD⁺

Answer 1

NADH, NAD⁺, and pyruvate are the compounds that couple the stages of cellular respiration.

Step-by-step explanation:

The compounds that couple the stages of cellular respiration are:

NADH - NADH is produced in glycolysis and the Krebs cycle, and it is then used as an input in the electron transport chain.

NAD⁺ - NAD⁺ is regenerated in the electron transport chain and is used as an input in glycolysis and the Krebs cycle.

Pyruvate - Pyruvate is formed in glycolysis and is converted into Acetyl CoA, which enters the Krebs cycle.