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
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
Viral genomes may be composed of（）
A. RNA
B. only
C. B．DNA
D. only
E. C．either
F. RNA or DNA
G. D．both
H. RNA and DNA
Griffith’s experiment injecting a mixture of dead
and live bacteria into mice demonstrated that （choose the correct answer）（）Griffith’s experiment injecting a mixture of dead
and live bacteria into mice demonstrated that （choose the correct answer）（）
A. DNA
B. is double-stranded
C. B．mRNA
D. of eukaryotes differs from mRNA of prokaryotes
E. C．A
F. factor was capable of transforming one bacterial cell type to another
G. D．Bacteria
H. can recover from heat treatment if live helper cells are present
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