Multiple Choice
Which process in cellular respiration involves the exchange of oxygen and nutrients for waste products of metabolism at the cellular level?
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8. Respiration
Introduction to Cellular Respiration
Multiple Choice
Which of the following correctly represents the main stages of cellular respiration in the order they occur?
A
Electron transport chain → Glycolysis → Krebs cycle
B
Krebs cycle → Glycolysis → Electron transport chain
C
Glycolysis → Krebs cycle → Electron transport chain
D
Glycolysis → Electron transport chain → Krebs cycle
Verified step by step guidance1
Step 1: Begin by understanding the process of cellular respiration, which is the metabolic pathway that converts glucose into energy (ATP) in cells. It consists of three main stages: Glycolysis, Krebs cycle (Citric Acid Cycle), and Electron Transport Chain.
Step 2: Glycolysis is the first stage of cellular respiration. It occurs in the cytoplasm and breaks down one molecule of glucose into two molecules of pyruvate, producing a small amount of ATP and NADH. This step does not require oxygen.
Step 3: The Krebs cycle (Citric Acid Cycle) is the second stage. It occurs in the mitochondria and processes the pyruvate from glycolysis into carbon dioxide while generating high-energy electron carriers (NADH and FADH2) and a small amount of ATP.
Step 4: The Electron Transport Chain is the final stage. It occurs in the inner mitochondrial membrane, where the high-energy electrons from NADH and FADH2 are used to create a proton gradient that drives the synthesis of ATP through oxidative phosphorylation.
Step 5: Based on the sequence of these processes, the correct order of the main stages of cellular respiration is: Glycolysis → Krebs cycle → Electron Transport Chain.
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