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【判断题】
体育锻炼是人们自觉地或义务地从事体育活动的锻炼过程,其主要目标是强身健体、增进健康、愉悦身心。
A.
正确
B.
错误
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【判断题】DNA has a triple helix that stores genetic information.
A.
正确
B.
错误
【单选题】During fibrillogenesis of type I collagen, the triple helix of the procollagen molecule is formed at which of the following locations?
A.
Extracellular space
B.
Golgi apparatus
C.
Nucleus
D.
Rough endoplasmic reticulum
E.
Secretory vesicles
【单选题】(2分)概率密度曲线和直方图曲线的主要区别是 ?
A.
直方图曲线的计算方法与概率密度曲线的计算方法不相同;
B.
直方图曲线的形状与概率密度曲线的形状不相同;
C.
直方图曲线上的值大于概率密度曲线;
D.
概率密度曲线的积分为1,直方图曲线的积分部位1;
【单选题】概率密度曲线和直方图曲线的主要区别是 ?
A.
概率密度曲线的积分为1,直方图曲线的积分部位1;
B.
直方图曲线上的值大于概率密度曲线;
C.
直方图曲线的形状与概率密度曲线的形状不相同;
D.
直方图曲线的计算方法与概率密度曲线的计算方法不相同;
【单选题】In the a helix, the hydrogen bonds:
A.
are roughly parallel to the axis of the helix.
B.
are roughly perpendicular to the axis of the helix.
C.
occur mainly between electronegative atoms of the R groups.
D.
occur only between some of the amino acids of the helix.
E.
occur only near the amino and carboxyl termini of the helix.
【简答题】螺旋-转角-螺旋基序(helix-turn-helix motif)
【单选题】Collagen provides great tensile strength to connective tissue by its structure as a triple helix. Which amino acid is critical in allowing triple-helix formation?
A.
Proline
B.
Hydroxyproline
C.
Lysine
D.
Glycine
E.
Elastin
【简答题】α螺旋-转角-α螺旋基序模体(helix-turn-helix motif)
【简答题】α-螺旋(α-helix)
【简答题】螺旋-环-螺旋(helix-loop-helix)
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