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【单选题】
下列有关染色体、DNA、基因、脱氧核苷酸的说法，不正确的是（）A.
基因一定位于染色体上
B.
核基因在染色体上呈线性排列
C.
一条染色体上含有1个或2个DNA分子
D.
四种脱氧核苷酸的数目和排列顺序决定了基因的多样性和特异性
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【单选题】Government is believed to differ strikingly from business in that government is characterized by ______.
A.
Its absolute control of power
B.
Its function in preserving personal freedom
C.
Its role in protecting basic American values
D.
Its democratic way of exercising leadership
【单选题】Government is believed to differ strikingly from business in that government is characterized by ______.
A.
its absolute control of power
B.
its function in preserving personal freedom
C.
its role in protecting basic American values
D.
its democratic way of exercising leadership
【简答题】由美国某兄弟农场培育,产仔多、生长最快、性情温顺、对性激素感受性高,在我国广泛使用的封闭群大鼠是A. WistA.r B. SprA.gue-D.A.wley D. C. Long-EvA.ns D. LOU/C.
【单选题】由美国某兄弟农场培育,产仔多、生长最快、性情温顺、对性激素感受性高,在我国广泛使用的封闭群大鼠是
A.
wistar
B.
SD
C.
Long-Evans
D.
LOU/C
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