题目内容

Which of the following are involved in immune synapses in T-cell activation? 1. MHC molecule 2. T cell receptor 3. Costimulatory molecules 4. Adhesion molecules

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

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Which of the following are the two main classes of T cell receptors (TCR)? 1. αβ 2. γδ 3. αγ 4. βδ

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

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___.

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

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