题目内容

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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The DNA that makes up bacterial chromosomes is（）

A. single-stranded
B. circular
C. and supercoiled
D. C．complexed
E. with histones
F. D．all
G. the above

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The prokaryotic organism that has been the subject of many genetic studies is（）

A. Saccharomyces cerevisiae
B. Neurospora crassa
C. E. coli
Drosophila melanogaster

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In his transformation experiments, Frederick
Griffith observed that virulent strains of Streptococcus pneumoniaeproduced _ colonies（）In his transformation experiments, Frederick
Griffith observed that virulent strains of Streptococcus pneumoniaeproduced _ colonies（）

A. smooth
B. shiny
C. B．rough
D. dry
E. C．exceptionally
F. large
G. D．unusually
H. colored

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A DNA nucleotide may consist of（）

A. a
B. ribose sugar, a phosphate group, and adenine
C. B．a phosphate group, deoxyribose, and cytosine
D. C．uracil
E. deoxyribose, and a phosphate group
F. D．deoxyribose
G. thymine, and a hydroxyl group

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Griffith’s experiment injecting a mixture of deadand live bacteria into mice demonstrated that （choose the cor­rect answer）（）Griffith’s experiment injecting a mixture of deadand 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

The DNA that makes up bacterial chromosomes is（）

The prokaryotic organism that has been the subject of many genetic studies is（）

In his transformation experiments, FrederickGriffith observed that virulent strains of Streptococcus pneumoniaeproduced ___ colonies（）In his transformation experiments, FrederickGriffith observed that virulent strains of Streptococcus pneumoniaeproduced ___ colonies（）

A DNA nucleotide may consist of（）

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

In his transformation experiments, Frederick
Griffith observed that virulent strains of Streptococcus pneumoniaeproduced _ colonies（）In his transformation experiments, Frederick
Griffith observed that virulent strains of Streptococcus pneumoniaeproduced _ colonies（）