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They require a host in order to reproduce.

How are viruses different from cells?

Package and protect the viral genome

Function of a viral structural elements.

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?

Enveloped viruses

Which type of virus would produce viral glycoproteins to be expressed on the host cell membrane?


Lysogenic viral DNA integrating into the host genome is referred to as

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?


In which stage is the viral DNA introduced into the cell?


In which stage does formation of mature viruses occur?


The host DNA is usually degraged during which 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?


The combination of a virus's protein coat and nucleic acid core

Viral capsids

What can assume one of three basic shapes?


Some viruses have an outer membrane

Tobacco virus

What is the first virus to be discovered and characterized?


Subunits that compose viral capsids


20-sided polyhedral capsid

Nucleic acid, presence of envelope, shape, size

How viruses are classified

Interactions between viral and cellular surface molecules

Host specificity of a virus is due to what?

Naked virion

Animal virus that does not have an envelope

Cells and viruses

Lipid membrane present in which type of organism?

In both cells and viruses

Double-stranded DNA genomes are found in which type of organism?

Only in viruses

Double-stranded RNA genomes can be found in which type of organism?

Cells only

Cytoplasm is a characteristic of which type of organism?


These are found in both cells and viruses.

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?

Temperate phage

Another term for a lysogenic phage


A process in which viral capsids are removed within the infected cell.

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?


During ______, viruses remain dormant in a cell.


Virus replication results in the death of the cell in a(n) infection.


A mechanism of release for enveloped viruses


Which of the following terms refers to a virus in the extracellular state?


The first virus to be identified was isolated from what type of organim?


The capsid of a virus is made out of which of the following types of molecules?

Helical, polyhedral, complex

Basic types of viral shapes

They are dependent on host cell organelles and enzymes for their replication.

Why do viruses have to infect host cells?

Tail Fibers

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


HeLa cells are an example of a _____ cell culture.

contain no nucleic acid

Scientists have determined that prion diseases are not caused by a type of slow virus because prions

Spontaneous process

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 _____.


Small, circular RNA molecules that are infectious to plants are 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.

Spongiform Encephalopathies

As a group, prion diseases are more formally known as ______.

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