题目内容

In bacteria such as E. coli, replication of
the chromosome is()In bacteria such as E. coli, replication of
the chromosome is()

A. semidiscontinuous
B. and bi-directional
C. B.discontinuous
D. and unidirectional
E. C.continuous
F. and bi-directional
G. D.semidiscontinuous
H. and unidirectional

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The sequence of nucleotides in one strand of DNA is5’-C C A C T G G-3’, What is the sequence of the complimentary strand
of DNA()The sequence of nucleotides in one strand of DNA is5’-C C A C T G G-3’, What is the sequence of the complimentary strand
of DNA()

A. 5’-C
B. C A C T G G-3’
C. B.3’-C C A C T G G-5’
D. C.5’-G G T C A C C-3’
E. D.3’-G G T G A C C-5’

The enzyme that unwinds the double helix to
facilitate replication is()The enzyme that unwinds the double helix to
facilitate replication is()

A. 3 ’ ž 5 ’exonuclease
B. DNA
C. helicase
D. C.DNA
E. polymerase
F. D.topoisomerase

DNA polymerases are enzymes that copy()

A. DNA
B. into DNA
C. B.DNA
D. into RNA
E. C.RNA
F. into DNA
G. D.RNA
H. into RNA

研究限制性内切核酸酶而获得1978年诺贝尔奖的科学家是()

A. Sanger
B. F
C. B.Arber W. and Smith H. O
D. C.Crick
E. D.Lederberg J

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