Ch 20-21 quiz questions

Which statement is NOT true about retroviruses?

• cDNA is used as a template to transcribe double-stranded DNA.

• HIV is a retrovirus.

• They contain an enzyme called reverse transcriptase.

• They incorporate themselves into the host cell genome, but replicate independently of the host DNA.

Study the life cycle diagram. Label A is the _____ life cycle.

• sexual

• lytic

• alternation of generations

• lysogenic

Which enzyme enables a retrovirus to convert its RNA genome into DNA?

• DNA helicase

• reverse transcriptase

• reverse helicase

• DNA ligase

Viruses are categorized according to all of the following EXCEPT

• their type of nucleic acid.

• size and shape.

• their method of reproduction, whether asexual or sexual.

• the presence or absence of an envelope.

Some enveloped animal viruses enters a host cell by

• All of the answer choices are correct.

• injecting their DNA or RNA into the host cell.

• fusion of their envelope with the host cell's plasma envelope.

• Both "fusion of their envelope with the host cell's plasma envelope" and "endocytosis" are correct.

Some, but not all, virus capsids are surrounded by

• a protein capsid.

• both DNA and RNA.

• a membranous envelope.

• either DNA or RNA.

The innermost portion of a virus's structure is made up of

• both DNA and RNA.

• either DNA or RNA.

• a protein capsid.

• a membranous envelope.

The cycle of viral infection that will rapidly result in the death of a bacterial cell is called the _____ cycle.

Multiple Choice

• lysogenic

• lytic

• lysol

• lysosome

Study the life cycle diagram. Label B is the _____ life cycle.

• alternation of generations

• lysogenic

• lytic

• sexual

What is the correct sequence of events in viral reproduction?

• attachment, fusion, biosynthesis, maturation, and release

• penetration, attachment, integration, biosynthesis, maturation, release

• attachment, penetration, biosynthesis, maturation and release

• endocytosis, uncoating, maturation, and release