超星 - Quiz of lecture 6

单选题

Which of the following is a NOT true statement concerning Transposable Genetic Elements ?

A. They move from one location to another within a chromosome.
B. They contain single-stranded DNA.
C. IS may result in insertion mutation.
D. Transposons may confer antibiotics resistance.

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单选题

Which statement is not right about bacterial genetics materials?

A. RTF in R-plasmid codes sex pili;
B. R-plasmid responsible for drug-resistance;
C. All R plasmids are conjugative plasmid.
D. R-plasmid carries R determinants.

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单选题

A plasmid is:

A. extrachromosomal DNA which closed circular double stranded molecule.
B. a molecule of RNA found in bacterial cells
C. distinguished from a chromosome by being circular
D. a structure in bacterial cells formed from plasma membrane

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单选题

Which statement about bacterial chromosome is not right?

A. It is a circular, double stranded DNA molecule
B. It is haploid genome.
C. It is supercoiled and tightly packaged in the nucleoid.
D. It is a linear, long DNA molecule in the nucleoid.

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单选题

Which statement about operon within bacterial chromosome DNA is not right?

A. In an operon, the same promoter can regulate the expression of several genes.
B. One RNA polymerase mediates the transcription of several copies of RNA.
C. An Operon is typically polycistronic.
D. Anoperon consists of a promoter linked witha series of genes.

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单选题

Bacterial DNA can be transcribed into five types of RNA. Which type of RNAmediates synthesis of a new DNA chain in replication?

A. RNA primer ;
B. rRNA;
C. mRNA;
D. tRNA

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单选题

Which statement about transfer of bacterial genetic information is not right?

A. Most phenotypes are determined by the transfer of genetic information.
B. It makes up the central dogma of genetics in bacteria cells.
C. Promoter binds the ribosome to initiate the translation of polypeptide.
DNA transcribed into mRNA, which is translated to form polypeptides.

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单选题

Which statement about replication of bacterial chromosome DNA is not right?

A. Each of the two DNA strands serves as a template for the synthesis of a new, complementary strand.
B. The synthesis of new DNA strand is in direction from 3` terminus to 5` end.
C. The synthesis of the lagging strand is discontinuous.
DNA polymerase III catalyzes synthesis of new DNA strand

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单选题

Which enzyme folds the bacterial chromosome into supercoiled form?

A. RNA polymerase;
B. DNA polymerase;
C. nuclease
D. gyrase;

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单选题

Which statement about bacterial chromosome is not right?

A. Most bacterial chromosome is a haploid genome.
B. The bacterial chromosome folds to be supercoils like a skein of yarn.
C. The bacterial chromosome is located in the nucleoid.
D. The chromosome of Vibrio cholera is of diploid genome.

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