Prokaryotic chromosomes consist mostly of（）
A. unique
B. sequence DNA only
C. B．repetitive
D. sequence DNA only
E. C．either
F. unique sequence or repetitive sequence DNA
G. D．both
H. unique sequence and repetitive sequence
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At the conclusion of DNA replication, the two
resulting DNA double helices each contain（）At the conclusion of DNA replication, the two
resulting DNA double helices each contain（）
A. one parental
B. and one progeny strand
C. B．two
D. parental or two progeny strands
E. C．stretches
F. of progeny DNA interspersed with parental DNA along both strands
G. D．two
H. newly synthesized strands
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（）
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（）
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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