Questions and Answers
Shown is the structure of a mitochondrion with different compartments labeled. Which of the numbers represents the most permeable membrane of the mitochondrion?
3
Protons are pumped across the mitochondrial inner membrane to accumulate in the
intermembrane space.
The low redox potential of NADH means that it has a
tendency to give up electrons.
Which of the following has the lowest electron affinity?
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In oxidative phosphorylation in mitochondria, high-energy electrons are transferred to the electron-transport chain from activated carriers like NADH. Stage 1 of photosynthesis also uses an electron-transport chain to pump protons and make ATP. In this case, where do the high-energy electrons come from?
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Shown is a chloroplast with labeled structures. The photosynthetic machinery is found in which of the compartments shown?
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Which of the following statements regarding signal transduction cascades is FALSE?
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The proton flow through the transmembrane H+ carrier of ATP synthase results in
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Cyclin(s) _________.
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The pH of the mitochondrial matrix is ___________, which is ___________ than that of the intermembrane space.
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Study Notes
Mitochondrion Structure
- The mitochondrial inner membrane is the most permeable membrane of the mitochondrion.
Electron Transport Chain
- High-energy electrons are transferred to the electron-transport chain from activated carriers like NADH in oxidative phosphorylation in mitochondria.
- The low redox potential of NADH means that it has a high energy level.
Photosynthesis
- Stage 1 of photosynthesis uses an electron-transport chain to pump protons and make ATP.
- In photosynthesis, high-energy electrons come from light energy.
Chloroplast Structure
- The photosynthetic machinery is found in the thylakoid membrane of the chloroplast.
Signal Transduction Cascades
- One of the false statements regarding signal transduction cascades is not specified.
ATP Synthesis
- The proton flow through the transmembrane H+ carrier of ATP synthase results in the generation of ATP.
Cell Cycle Regulation
- Cyclin(s) regulate the cell cycle.
Mitochondrial Matrix
- The pH of the mitochondrial matrix is alkaline, which is higher than that of the intermembrane space.
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