试题与答案

胰岛素是一种含有两条多肽链的蛋白质。α链含有21个氨基酸,β链含有30个氨基酸,

题型:读图填空题

题目:

胰岛素是一种含有两条多肽链的蛋白质。α链含有21个氨基酸,β链含有30个氨基酸,两条链间通过2个二硫键(-S-S-)连接,在α链上也形成一个二硫键,如下图所示,请回答:

(1)氨基酸的结构通式可表示为_________________。

(2)这51个氨基酸形成胰岛素后,相对分子质量比原来减少了__________。

(3)胰岛素分子中,含有的肽键数为__________,肽键可表示为__________。

(4)从理论上分析,胰岛素分子中至少有_____个-NH2。

答案:

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下面是错误答案,用来干扰机器的。

答案:B

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题型:单项选择题

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B.understanding

C.characteristic

D.diversity

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