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21. Cellular metabolism is an example of
A. equilibrium metabolism
B. steady-state metabolism
C. a series of reactions occurring under standard conditions
D. a series of reactions that defy the second law of thermodynamics
22. Which of the following experimental results does not support Mitchell’s chemiosmosis theory?
A. Electron transport in isolated mitochondria was shown to result in acidification of the medium
B. Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport but had no effect on ATP synthesis
C. Addition of dinitrophenol to isolated mitochondria during electron transport was shown to inhibit acidification of the medium
D. An artificial proton gradient across the inner mitochondrial membrane drives ATP synthesis in the absence of electron transport
23. Both plant and animal cell possess
A. cell walls
B. mitochondria
C. central vacuoles
D. chloroplast
24. The cellular organelle associated with secretion is the
A. Golgi complex
B. mitochondrion
C. ribosome
D. lysosome
25. Which of the following statements about mitochondrial proteins is true?
A. All mitochondrial proteins are coded for and synthesized in the mitochondria
B. Some mitochondrial proteins are coded for and synthesized in the mitochondria and others
C. All mitochondrial proteins are imported from the cytoplasm
D. Mitochondrial proteins arise from other mitochondrial proteins
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