H & G Molecular Genetics

Which of the following has a DNA genome surrounded by a protein coat?

• a retrovirus

• a virus

• a eukaryotic cell

• a prokaryotic cell

Which of the following is a laboratory application of restriction enzymes?

• to block replication of DNA

• to artificially force the transcription of DNA

• to prevent the translation of mRNA

• to cut DNA molecules at specific locations

When a virus infects a bacterium by injecting its DNA and the genome of the virus incorporated into the host cell, this is

• the lytic cell of a phage

• the lysogenic cell of a phage

• transposition by a virus

• retroviral infection

When the electric field was applied, the fragments of DNA in each of the three samples migrated to different locations along the gel. Which of the following explains the pattern shown here?

• The fragments differed in levels of radioactivity.

• The fragments differed in charges.

• The fragments differed in size.

• The fragments differed in solubility.

How many sites on DNA were cut by the particular restriction enzyme used in Sample 1 (far left?

• 6

• 7

• 8

• 9

A bacterium is infected with an experimentally constructed bacteriophage composed of the T2 phage protein coat and T4 phage DNA. The new phages produced by lysis of infected cells would have:

• T2 protein an T4 DNA.

• T2 protein and T2 DNA.

• T4 protein and T4 DNA.

• T4 protein and T2 DNA.

A mobile segment of DNA that travels from one location on a chromosome to another:

• Transcription

• Translation

• Transposon

• DNA methylation

The addition of chemical groups to certain DNA bases after DNA synthesis:

• Transcription

• Translation

• Transposon

• DNA methylation

The synthesis of polypeptides from the genetic information coded in mRNA

• Transcription

• Translation

• Transposon

• DNA methylation

The synthesis of RNA from a DNA template:

• Transcription

• Translation

• Transposon

• DNA methylation