1. A restriction enzyme is a. a gene. b. a segment of DNA. c. a segment of mRNA.

ID: 216314 • Letter: 1

Question

A restriction enzyme is

a. a gene. b. a segment of DNA.

c. a segment of mRNA. d. a protein that catalyzes the cutting of DNA at specific

2.Which of the following cannot be infected by viruses?

a. algae b. bacteria

c. animals d. all of these can be infected by viruses

3.Host specificity of a certain virus is determined by

a. reproductive stage of the virus. b. presence of surface spores.

c. receptors found on the host cell. d. none of the above.

4.Viruses are classified based on which of the following?

a. nucleic acid content. b. presence or absence of an envelope.

c. structure of capsid. d. all of the above.

1.d) a protein that catalyses the cutting of DNA at specific regions.

2. d. all of these can be affected by viruses.

3. c. receptors found on the host cell.

4. a nucleic acid content.

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