题目内容

Which of the following takes place during T-cell development?1. Positive selection 2. Negative selection 3. VDJ rearrangement

A. Only 1, 2
B. Only 1, 3
C. Only 2, 3
D. 1, 2, 3

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MHC class II molecules can present___.

A. Endogenous antigens
B. Exogenous antigens
C. Both A and B
D. Neither A nor B

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Which of the following microbial metabolites can be harvested for industrial use? 1. Primary metabolites 2. Secondary metabolites

A. 1
B. 2
C. Both 1 and 2
D. Neither 1 nor 2

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In making the following food, which one usually requires the use of yeast? 1. Bread 2. Yogurt 3. Wine 4. Dried beef

A. 1, 2
B. 1, 3
C. 2, 4
D. 1, 4

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Which of the following is correct about the use of microorganisms in sewage treatment?

A. Microorganisms are used rarely in sludge processing
B. Activated sludge undergoes aerobic decomposition
Cannot be in the form of fuel cells
D. Sludge treatment are usually in very small scale

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Which of the following takes place during T-cell development?1. Positive selection 2. Negative selection 3. VDJ rearrangement

A. Only 1, 2 B. Only 1, 3 C. Only 2, 3 D. 1, 2, 3

MHC class II molecules can present___.

Which of the following microbial metabolites can be harvested for industrial use? 1. Primary metabolites 2. Secondary metabolites

In making the following food, which one usually requires the use of yeast? 1. Bread 2. Yogurt 3. Wine 4. Dried beef

Which of the following is correct about the use of microorganisms in sewage treatment?

A. Only 1, 2
B. Only 1, 3
C. Only 2, 3
D. 1, 2, 3