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【单选题】
下列叙述中不属于蛋白质一级结构内容的是 ?A.
多肽链中氨基酸残基的种类、数目、排列次序
B.
多肽链中氨基酸残基的方式
C.
多肽链中主肽链的空间走向，如α-螺旋
D.
胰岛分子中A链与B链间含有两条二硫键，分别是A 7 -S-S-B 7 ，A 20 -S-S-B 19
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【单选题】For David, the marginal utility from an additional car is 2,000 units and the marginal utility from an additional vacation is 1,000 units. David is allocating all his budget. Hence to maximize his uti...
A.
shift his consumption from the vacation to the car.
B.
shift his consumption from the car to the vacation.
C.
save his budget by not spending it until he can afford both the car and the vacation.
D.
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E.
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