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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.
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
D.
一条染色体上含有1个或2个DNA分子
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参考答案：
举一反三
【判断题】短式网球运动前游戏练习要有简单的规则。( )
A.
正确
B.
错误
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【单选题】在牙齿发育阶段，如果饮用水中氟含量高于百万分之一，或经其他途径摄入过多的氟，可导致釉质形成不全和钙化不全的是( )
A.
釉质发育不全
B.
氟牙症
C.
四环素牙
D.
牙本质发育不全症
E.
牙骨质发育不全症
查看完整题目与答案
【判断题】Carotenoids are colorless molecules.
A.
正确
B.
错误
查看完整题目与答案
【单选题】Predict the genotypes and phenotypes of the F 1 progeny of a cross between two colorless plants, one homozygous for A and the other homozygous for B .
A.
AAbb , colorless
B.
aaBB , colorless
C.
AaBb , colored
D.
AaBb , colorless
查看完整题目与答案
【单选题】Sulfuric acid is a ______．
A.
Clear syrupy liquid with no odor
B.
Colorless-to-brown liquid with a choking odor when hot
C.
Colorless liquid with a pleasant fruity odor
D.
Whitish liquid with a faint，pleasant odor
查看完整题目与答案
【单选题】Predict the phenotypic ratio of the F 2 progeny of a cross between two colorless plants, one homozygous for A and the other homozygous for B .
A.
3 colored : 1 colorless
B.
9 colored : 7 colorless
C.
9 colorless : 7 colored
D.
15 colorless : 1 colored
查看完整题目与答案
【判断题】违反实体完整性规则时系统只能拒绝该操作
A.
正确
B.
错误
查看完整题目与答案
【判断题】违反实体完整性规则时系统只能拒绝该操作( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Water is tasteless, odorless, and nearly colorless (it has a slight hint of blue). It is a【C1】______ that is essential to all known forms of life in its pure form. Water is【C2】______ on Earth. It exis...
A.
stance
B.
substance
C.
composition
D.
material
查看完整题目与答案
【单选题】The clear colorless liquid that falls as rain, fills lake and rivers, and is necessary for life
A.
287. The clear colorless liquid that falls as rain, fills lake and rivers, and is necessary for life to exist is______. A．oxygen
B.
petrol
C.
water
D.
Flood
查看完整题目与答案
相关题目：
【判断题】短式网球运动前游戏练习要有简单的规则。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】在牙齿发育阶段，如果饮用水中氟含量高于百万分之一，或经其他途径摄入过多的氟，可导致釉质形成不全和钙化不全的是( )
A.
釉质发育不全
B.
氟牙症
C.
四环素牙
D.
牙本质发育不全症
E.
牙骨质发育不全症
查看完整题目与答案
【判断题】Carotenoids are colorless molecules.
A.
正确
B.
错误
查看完整题目与答案
【单选题】Predict the genotypes and phenotypes of the F 1 progeny of a cross between two colorless plants, one homozygous for A and the other homozygous for B .
A.
AAbb , colorless
B.
aaBB , colorless
C.
AaBb , colored
D.
AaBb , colorless
查看完整题目与答案
【单选题】Sulfuric acid is a ______．
A.
Clear syrupy liquid with no odor
B.
Colorless-to-brown liquid with a choking odor when hot
C.
Colorless liquid with a pleasant fruity odor
D.
Whitish liquid with a faint，pleasant odor
查看完整题目与答案
【单选题】Predict the phenotypic ratio of the F 2 progeny of a cross between two colorless plants, one homozygous for A and the other homozygous for B .
A.
3 colored : 1 colorless
B.
9 colored : 7 colorless
C.
9 colorless : 7 colored
D.
15 colorless : 1 colored
查看完整题目与答案
【判断题】违反实体完整性规则时系统只能拒绝该操作
A.
正确
B.
错误
查看完整题目与答案
【判断题】违反实体完整性规则时系统只能拒绝该操作( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Water is tasteless, odorless, and nearly colorless (it has a slight hint of blue). It is a【C1】______ that is essential to all known forms of life in its pure form. Water is【C2】______ on Earth. It exis...
A.
stance
B.
substance
C.
composition
D.
material
查看完整题目与答案
【单选题】The clear colorless liquid that falls as rain, fills lake and rivers, and is necessary for life
A.
287. The clear colorless liquid that falls as rain, fills lake and rivers, and is necessary for life to exist is______. A．oxygen
B.
petrol
C.
water
D.
Flood
查看完整题目与答案
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