CAMPBELL-BIOLOGY CHAPTER 19
EXAM Q’S AND A’S
virus - answer- package of nucleic acid wrapped in a protein coat that must use a
host cell's machinery to reproduce itself
Mayer - answer- becomes first person to take sap from infected tobacco mosaic
leaves and infect healthy ones
Stanley - answer- American biologist who crystallized the infectious particle now
known as tobacco mosaic virus.
capsid - answer- the outer covering of protein surrounding the nucleic acid of a virus
capsomeres - answer- morphological subunits from which the virus capsid is built
helical viruses - answer- rod-shaped
viral envelope - answer- A membrane, derived from membranes of the host cell, that
cloaks the capsid, which in turn encloses a viral genome.
bacteriophage - answer- a virus that infects bacteria
host range - answer- The limited range of host cells that each type of virus can infect
and parasitize.
lytic cycle - answer- a method of viral replication that results in the destruction of a
host cell and the release of many new virus particles
virulent phage - answer- A phage that reproduces only by a lytic cycle.
restriction enzymes - answer- enzyme that cuts DNA at a specific sequence of
nucleotides
lysogenic cycle - answer- a phage replication cycle in which the viral genome
becomes incorporated into the bacterial host chromosome as a prophage and does
not kill the host
temperate phages - answer- Phages that are capable of using either the lytic or
lysogenic cycle.
prophage - answer- the viral DNA that is embedded in the host cell's DNA
retrovirus - answer- An RNA virus that reproduces by transcribing its RNA into DNA
and then inserting the DNA into a cellular chromosome; an important class of
cancer-causing viruses.
EXAM Q’S AND A’S
virus - answer- package of nucleic acid wrapped in a protein coat that must use a
host cell's machinery to reproduce itself
Mayer - answer- becomes first person to take sap from infected tobacco mosaic
leaves and infect healthy ones
Stanley - answer- American biologist who crystallized the infectious particle now
known as tobacco mosaic virus.
capsid - answer- the outer covering of protein surrounding the nucleic acid of a virus
capsomeres - answer- morphological subunits from which the virus capsid is built
helical viruses - answer- rod-shaped
viral envelope - answer- A membrane, derived from membranes of the host cell, that
cloaks the capsid, which in turn encloses a viral genome.
bacteriophage - answer- a virus that infects bacteria
host range - answer- The limited range of host cells that each type of virus can infect
and parasitize.
lytic cycle - answer- a method of viral replication that results in the destruction of a
host cell and the release of many new virus particles
virulent phage - answer- A phage that reproduces only by a lytic cycle.
restriction enzymes - answer- enzyme that cuts DNA at a specific sequence of
nucleotides
lysogenic cycle - answer- a phage replication cycle in which the viral genome
becomes incorporated into the bacterial host chromosome as a prophage and does
not kill the host
temperate phages - answer- Phages that are capable of using either the lytic or
lysogenic cycle.
prophage - answer- the viral DNA that is embedded in the host cell's DNA
retrovirus - answer- An RNA virus that reproduces by transcribing its RNA into DNA
and then inserting the DNA into a cellular chromosome; an important class of
cancer-causing viruses.
