Multiple Choice
In cellular respiration, the energy stored in the covalent bonds of glucose is ultimately used to produce which molecule that serves as the main energy currency of the cell?
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8. Respiration
Introduction to Cellular Respiration
Multiple Choice
Which of the following are waste products produced during cellular respiration?
A
NADH and FADH\(_2\)
B
Glucose and oxygen
C
Carbon dioxide (\(\mathrm{CO_2}\)) and water (\(\mathrm{H_2O}\))
D
ATP and pyruvate
Verified step by step guidance1
Step 1: Begin by understanding the process of cellular respiration. Cellular respiration is a metabolic pathway that converts glucose and oxygen into energy (ATP), with waste products being released as a result of the chemical reactions.
Step 2: Recall the main stages of cellular respiration: glycolysis, the citric acid cycle (Krebs cycle), and oxidative phosphorylation. Waste products are generated primarily during the citric acid cycle and oxidative phosphorylation.
Step 3: During the citric acid cycle, carbon dioxide (\(\mathrm{CO_2}\)) is produced as a byproduct when carbon atoms are removed from intermediate molecules. This occurs through decarboxylation reactions.
Step 4: In oxidative phosphorylation, water (\(\mathrm{H_2O}\)) is formed as a waste product when oxygen acts as the final electron acceptor in the electron transport chain, combining with electrons and protons.
Step 5: Eliminate the incorrect options by analyzing their roles in cellular respiration. NADH and FADH\(_2\) are electron carriers, glucose and oxygen are reactants, ATP is the energy product, and pyruvate is an intermediate. The correct waste products are carbon dioxide (\(\mathrm{CO_2}\)) and water (\(\mathrm{H_2O}\)).
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