题目内容

The X-ray diffraction data obtained by Rosalind
Franklin suggested （choose the correct answer）（）The X-ray diffraction data obtained by Rosalind
Franklin suggested （choose the correct answer）（）

A. DNA
B. is a helix with a pattern that repeats every 3.4 nanometers
C. B．Purines
D. are hydrogen bonded to pyrimidines
E. C．DNA
F. is a left-handed helix
G. D．DNA
H. is organized into nucleosomes

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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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The X-ray diffraction data obtained by RosalindFranklin suggested （choose the correct answer）（）The X-ray diffraction data obtained by RosalindFranklin suggested （choose the correct answer）（）

A. DNA B. is a helix with a pattern that repeats every 3.4 nanometers C. B．Purines D. are hydrogen bonded to pyrimidines E. C．DNA F. is a left-handed helix G. D．DNA H. is organized into nucleosomes

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

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

The X-ray diffraction data obtained by Rosalind
Franklin suggested （choose the correct answer）（）The X-ray diffraction data obtained by Rosalind
Franklin suggested （choose the correct answer）（）

A. DNA
B. is a helix with a pattern that repeats every 3.4 nanometers
C. B．Purines
D. are hydrogen bonded to pyrimidines
E. C．DNA
F. is a left-handed helix
G. D．DNA
H. is organized into nucleosomes

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

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（）