Chapter 26.4, Problem 26.4QC

Interpretation Introduction

Interpretation: The energy source of GTP in the step-5 of the citric acid cycle should be determined.

Concept Introduction: Aerobic respiration occurs in two steps;

• Glycolysis
• Citric acid cycle

Glycolysis is the first step that forms pyruvate. In the presence of oxygen means aerobic respiration, this pyruvate enters in the Krebs cycle and extracts energy in the form of electrons transfer. Electrons are transferred from the pyruvate to the receptors like ${\text{NAD}}^{\text{+}}{\text{, GDP, and FAD and CO}}_{\text{2}}$ gas is formed as the waste product. The products of citric acid cycles act as precursors for electron transport chains.