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