Multiple Choice
Which of the following acts as an electron carrier in cellular respiration?
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8. Respiration
Electron Transport Chain
Multiple Choice
Generation of proton gradients across membranes occurs during which of the following reactions?
A
Calvin cycle in chloroplasts
B
Glycolysis in the cytoplasm
C
Electron transport chain in mitochondria
D
Krebs cycle in the mitochondrial matrix
Verified step by step guidance1
Understand the concept of proton gradients: Proton gradients are differences in proton concentration across a membrane, which are crucial for ATP synthesis in cells.
Identify the location where proton gradients are generated: Proton gradients are typically formed across the inner mitochondrial membrane during cellular respiration.
Recognize the process involved: The electron transport chain is the key process that generates proton gradients by moving electrons through a series of complexes, which pump protons from the mitochondrial matrix to the intermembrane space.
Differentiate between the processes: The Calvin cycle occurs in chloroplasts and is involved in photosynthesis, not in generating proton gradients. Glycolysis occurs in the cytoplasm and does not involve membrane-bound proton gradients. The Krebs cycle occurs in the mitochondrial matrix but does not directly generate proton gradients.
Conclude with the correct process: The electron transport chain in mitochondria is responsible for the generation of proton gradients, which are essential for ATP production through chemiosmosis.
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