chapter 13 quiz

Another term for a lysogenic phage is a ___ phage

temperate

Why is lysogeny advantageous to a bacteriophage?

the genetic material of the bacteriophage can be passed on to future generations of cells

Which of the following membranes can give rise to a viral envelope?

the nuclear and cytoplasmic membranes and the endoplasmic reticulum

(True/False) Protozoa are susceptible to viral attack.

true

(true/false) Bacteriophages are cheaper and easier to culture than animal viruses.

true

(true/false) Transcription of RNA from RNA does not occur in uninfected cells.

true

Viruses are primarily classified according to their

type of nucleic acid

The infectious particles of fungi have RNA genomes and lack a capsid. They are therefore similar to

viroids

Which of the following statements concerning viruses is FALSE?

viruses enter a cell to complete the replication they have begun extracellular

Which of the following agents is capable of inducing conversion of a prophage back to a lytic phage?

UV light and X rays

A mechanism of release for enveloped viruses

budding

The number of new bacteriophages released from each infected cell is called the

burst size

Viroid's infect

plants

Viruses are shed slowly and steadily

persistent infection

the combination on a virus's protein coat and nucleic acid core is called the ___

nucleocapsid

Virus infection results in cancer

oncogenesis

Who was the first person to demonstrate the existence of viruses?

Ivanowsky

In contrast to most dsDNA animal viruses, the poxviruses replicate solely in the cytoplasm of the host cell. This fact implies that the viral genome may encode

a DNA polymerase

The phenomenon of transduction is associated with which of the stages of a bacteriophage infection cycle?

assembly

The enzyme lysozyme is critical for which of the stages of a bacteriophage T4 infection cycle?

entry and release

Which of the following would NOT be found as a component of a bacteriophage?

envelope

(true/false) viruses cause most human cancer

false

lipid membrane

found both in cells and viruses

double-stranded DNA genome

found in both cells an viruses

proteins

found in both cells and viruses

cytoplasm

found only in cells

double-stranded RNA genome

found only in viruses

Which of the following statements comparing virus classification and taxonomy of organisms is true?

genus and specific epithet are used in both classification systems

Viruses remain dormant in a cell

latency

Bacteriophages use the enzyme ____ to breach the bacterial cell wall.

lysozyme

Virus replication results in the death of the cell

lytic replication

an animal virus that does not have an envelope is describes as a ____ virion

naked

Which of the following individuals discovered prions?

prusiner