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【单选题】
[ ]关于二级结构叙述哪一项不正确?
A.
右手α-螺旋比左手α-螺旋稳定，因为左手α-螺旋中L-构型氨基酸残基侧链空间位阻大，不稳定；
B.
一条多肽链或某多肽片断能否形成 a - 螺旋，以及形成的螺旋是否稳定与它的氨基酸组成和排列顺序有极大关系；
C.
多聚的氨基酸 R 基空间位阻大，因而不能形成α - 螺旋；
D.
b -折叠在蛋白质中反平行式较平行式稳定，所以蛋白质中只有反平行式。
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