Their nucleic acids are injected into the cell
How do naked viruses differ from enveloped viruses in their attachment/penetration phase?
Which of the following viruses is transcribed from RNA to DNA to RNA during the replication cycle?
Which type of virus would produce viral glycoproteins to be expressed on the host cell membrane?
Exposure to UV light
Which of the following events might trigger induction of a temperate bacteriophage?
The host cell dies during the lytic stage
How is the lytic cycle different from the lysogenic cycle with respect to the infected host cell?
It is copied every time the host DNA replicates.
What is the fate of the prophage during the lysogenic stage?
The virus would not be able to infect new hosts.
What would be the fate of a lytic bacteriophage if the host cell died prior to the assembly stage?
Capsomere, Capsid, Nucleocapsid, Virion
The following viral structures are in order from simplest to most complex.
Most viruses can infect only certain types of cells.
Most viral genomes are much smaller than the genomes of the cells they infect. Which of the following CANNOT be inferred from this statement?
It does not perform the physiological functions carried out by the cytoplasmic membrane
The envelope found in some virus particles differs from the cytoplasmic membrane of cells in what way?
Interactions between viral and cellular surface molecules
Host specificity of a virus is due to what?
Infected cell may live for a long time
Infections with enveloped animal viruses are similar to lysogenic phage infections because
A phage T4 particle that has lost its tail fibers will have a replication cycle that is blocked at which of the following stages?
Random collisions, chemical attractions, and receptor specificity
Which of the following is associated with the attachment of a bacteriophage to a bacterial cell?
The phenomenon of transduction is associated with which of the stages of a bacteriophage infection cycle?
The genetic material of the bacteriophage can be passed on to future generations of cells
Why is lysogeny advantageous to a bacteriophage?
The nuclear and cytoplasmic membranes and the endoplasmic reticulum
Which of the following membranes can give rise to a viral envelope?
The HIV provirus is integrated permanently into the host cell's DNA
How is the HIV provirus different from a lambda phage prophage?
They are dependent on host cell organelles and enzymes for their replication.
Why do viruses have to infect host cells?
The ____ of a bacteriophage are most useful the attachment stage of the lytic replication cycle.
Viral DNA becomes a physical part of the bacterial chromosome only in a lysogenic cycle.
Which of the following is a major difference between a lysogenic and a lytic cycle in bacteriophages?
Pili, flagella, cell wall
Bacteriophages can use all of the following structures for attachment to a bacterial cell
The phage persists for generations in the bacterial chromosome.
What is the advantage of lysogeny to lambda phage
contain no nucleic acid
Scientists have determined that prion diseases are not caused by a type of slow virus because prions
The assembly stage of the viral life cycle is usually a ______, although in some viruses it is controlled by enzymes
A prophage is excised from the host chromosome and viral replication proceeds in a process called _____.
An infection in which a host cell sheds new viruses slowly and steadily is called a(n) __________ infection.
A technique used to estimate the numbers of bacteriophages in a culture is called a(n) __________ assay.