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 m the diagram below. In this activity, you will identify the compounds that coupe 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

Answer 1

a. Pyruvate (The end product of glycolysis yields two pyruvate molecules with the formation of 2ATP and 2NADH) 

b. NADH (NADH formed in glycolysis is fed to electron transport chain for oxidative phosphorylation to synthesize ATP molecules)

c. NAD+ (Oxidation of NADH yield NAD+ which fed in glycolysis to accept two electrons and two protons for releasing energy to add another phosphate for forming 1,3-bisphosphoglycerate)

d. NADH (Apart from 2 FADH2 and 2ATP, the citric acid cycle produces 6NADH molecules during the complete breakdown of pyruvate molecules to carbon dioxide. These NADH molecules are fed to electron transport chain for synthesizing ATP through proton gradient)

e. NAD+ (Oxidation of NADH yield NAD+ which fed in the citric acid cycle for the conversion of isocitrate to succinyl CoA and malate to oxaloacetate)