Multiple Choice
Which of the following best describes the primary purpose of cellular respiration in living organisms?
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8. Respiration
Introduction to Cellular Respiration
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Which of the following metabolic processes consumes \( \mathrm{CO}_2 \)?
A
Citric acid cycle
B
Photosynthesis
C
Fermentation
D
Glycolysis
Verified step by step guidance1
Understand the role of carbon dioxide (
) in metabolic processes. It can either be produced as a byproduct or consumed as a reactant depending on the process.
Review the Citric Acid Cycle (Krebs Cycle): This process occurs in cellular respiration and primarily produces
as a byproduct, rather than consuming it.
Examine Photosynthesis: In this process, plants and other photosynthetic organisms use
as a reactant during the Calvin Cycle to produce glucose. This is the metabolic process that consumes
.
Analyze Fermentation: This anaerobic process does not involve the consumption of
. Instead, it focuses on regenerating NAD+ for glycolysis and may produce ethanol or lactic acid as byproducts.
Consider Glycolysis: This is the initial step of cellular respiration, breaking down glucose into pyruvate. It does not consume or produce
directly.
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