题目内容

DNA polymerase catalyzes the formation of a
phosphodiester bond between a（）DNA polymerase catalyzes the formation of a
phosphodiester bond between a（）

A. 5’phosphate and a5’hydroxyl
B. group
C. B．3’phosphate and a5’hydroxyl
D. group
E. C．5’phosphate and a3’hydroxyl
F. group
G. D．3’phosphate and a3’hydroxyl
H. group

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Many types of mammalian cancer cells are notable for
their（）Many types of mammalian cancer cells are notable for
their（）

A. telomerase activity
B. lack
C. of telomerase activity
D. C．lack
E. of telomeres
F. D．increased
G. number of telomeres

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During synthesis, all DNA polymerases add
nucleotides in which direction（）During synthesis, all DNA polymerases add
nucleotides in which direction（）

A. from
B. left to right
C. B．from3’to5’
D. C．from5’to3’
E. D．in
F. more than one direction at a time

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1941年，（）提出了一个基因一个酶假说

A. George Beadle and
B. Edward Tatum
C. B．Johansen W
D. C．Jacob
E. D．Monod

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In the Hershey-Chase blender experiments, their
major conclusion was that（）In the Hershey-Chase blender experiments, their
major conclusion was that（）

A. a
B. single gene directed the synthesis of a single polypeptide
C. B．DNA
D. was the genetic material
E. C．DNA
F. was a double helix
G. D．the
H. genetic material was located in the nucleus of cells

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DNA polymerase catalyzes the formation of aphosphodiester bond between a（）DNA polymerase catalyzes the formation of aphosphodiester bond between a（）

A. 5’phosphate and a5’hydroxyl B. group C. B．3’phosphate and a5’hydroxyl D. group E. C．5’phosphate and a3’hydroxyl F. group G. D．3’phosphate and a3’hydroxyl H. group

Many types of mammalian cancer cells are notable fortheir（）Many types of mammalian cancer cells are notable fortheir（）

During synthesis, all DNA polymerases addnucleotides in which direction（）During synthesis, all DNA polymerases addnucleotides in which direction（）

1941年，（）提出了一个基因一个酶假说

In the Hershey-Chase blender experiments, theirmajor conclusion was that（）In the Hershey-Chase blender experiments, theirmajor conclusion was that（）

DNA polymerase catalyzes the formation of a
phosphodiester bond between a（）DNA polymerase catalyzes the formation of a
phosphodiester bond between a（）

A. 5’phosphate and a5’hydroxyl
B. group
C. B．3’phosphate and a5’hydroxyl
D. group
E. C．5’phosphate and a3’hydroxyl
F. group
G. D．3’phosphate and a3’hydroxyl
H. group

Many types of mammalian cancer cells are notable for
their（）Many types of mammalian cancer cells are notable for
their（）

During synthesis, all DNA polymerases add
nucleotides in which direction（）During synthesis, all DNA polymerases add
nucleotides in which direction（）

In the Hershey-Chase blender experiments, their
major conclusion was that（）In the Hershey-Chase blender experiments, their
major conclusion was that（）