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1. In plant cells, which of the following is not a function of the large central vacuoles of plant cells?
a. Storage of food
b. Support
c. Contractile regulation of
d. Waste storage water content
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Answer: (c).Contractile regulation of

2. Which of the following can be found as a part of the mitochondrial matrix?
a. Ribosomes
b. DNA
c. Enzymes
d. All of these
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Answer: (d).All of these

3. 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
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Answer: (b).steady-state metabolism

4. 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
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Answer: (b).Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis

5. Both plant and animal cell possess
a. cell walls
b. mitochondria
c. central vacuoles
d. chloroplast
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Answer: (b).mitochondria

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