Chapter 13 Clicker Questions

If one virus particle infects a cell approximately how many infectious virus particles are present during the synthesis step of the virus replication cycle

0

What is a prophage

A copy of the viral genome inserted into the host cell chromosome

What is a prion

A proteinaceous infectious particle

Acellular pathogens include ____.

All of the above: viruses viroids prions

A virion is composed of a(n)

Capsid and a nucleic acid core

What is the name of the proteinaceous subunit that makes up the viral capsid

Capsomere

All prion diseases result in what symptoms

Fatal neurological degeneration

What prevents a prophage from becoming lytic

It encodes a protein that suppresses its own viral genes

What is the difference in phage T4 and lambda phage

Phage T4 uses lytic replication; lambda follows lysogenic replication

What is a common and relatively inexpensive method for estimating numbers of phage

Plaque assay

What are viroids

Small circular pieces of RNA that are infectious to plants

Which of the following is an accepted argument for why viruses should be considered living

They posses genomes with instructions for replicating themselves

Which of the following is NOT used to culture viruses

Tryptic soy agar

Which statement MOST accurately describes lytic viral replication

Viral replication usually results in the death and lysis of the host cell

How are viroids different from viruses

Viroids lack capsids

Which of the following is NOT a way that viruses can cause human cancer

Viruses can cause abnormalities in the host cytoplasmic membrane

Can a lysogenic virus ever switch to the lytic replication cycle

Yes; but it can switch only after the viral DNA is excised from the host genome by induction