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Micro test2 chap6

Viruses have all the following except
A. definite shape.
B. metabolism.
C. genes.
D. ability to infect host cells.
E. ultramicroscopic size.


Host cells of viruses include
A. human and other animals.
B. plants and fungi.
C. bacteria.
D. protozoa and algae.
E. All of the choices are correct.

All are correct

The core of every virus particle always contains

either DNA or RNA.

Classification of viruses into families involves determining all the following characteristics except
A. type of nucleic acid.
B. type of capsid.
C. presence of an envelope.
D. biochemical reactions.
E. nucleic acid strand number.

Biochemical Reactions

Which of the following represents a virus family name?
A. Herpes simplex virus
B. Herpesviridae
C. Picornavirus
D. Enterovirus
E. Hepatitis B virus


Virus capsids are made from subunits called


Helical and icosahedral are terms used to describe the shapes of a virus


Which of the following is correct about viruses?
A. cannot be seen with a light microscope
B. are procaryotic
C. contain 70S ribosomes
D. undergo binary fission
E. can be grown on nutrient agar

Cannot be seen with a light microscopr

All of the following pertain to virus envelopes except they
A. are gained as a virus leaves the host cell membrane.
B. are gained as a virus leaves the nuclear membrane.
C. contain special virus proteins.
D. help the virus particle attach to host cells.
E. are located between the capsid and nucleic acid.

Help the virus particles attach to host cells

Which of the following is not associated with every virus?
A. envelope
B. capsomers
C. capsid
D. nucleic acid
E. genome


These structures are used by bacteriophages to attach to host cell receptors.
A. sheath
B. tail fibers
C. nucleic acid
D. capsid head
E. None of the choices are correct.

None are correct

Which is incorrect about prophages?
A. present when the virus is in lysogeny
B. formed when viral DNA enters the bacterial chromosome
C. replicated with host DNA and passed on to progeny
D. cause lysis of host cells
E. occur when temperate phages enter host cells

Cause lysis of host cells

T-even phages

Infect Escherichia Coli cells

The correct sequence of events in viral multiplication is

Adsorption, penetration, replication, maturation, assembly, release.

The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is

Injection of the viral nucleic acid into the host cell.

Viruses acquire envelopes around their nucleocapsids during


Which of the following will not support viral cultivation?
A. live lab animals
B. embryonated bird eggs
C. primary cell cultures
D. continuous cell cultures
E. blood agar

Blood agar

In general, most DNA viruses multiply in the host cell's _____, while most RNA viruses multiply in the host cell's _____.

Nucleus, Cytoplasm

Host range is limited by

Type of host cell receptors on cell membrane

The virus-induced, specific damage to the host cell that can be seen in a light microscope is called

Cytopathic effects

Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called


Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called


Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called


Oncogenic viruses include all the following except
A. hepatitis B virus.
B. measles virus.
C. papillomavirus.
D. HTLVI and HTLVII viruses.
E. Epstein-Barr virus.

Measles virus

Which of the following is a type of cytopathic effect?
A. inclusions in the nucleus
B. multinucleated giant cells
C. inclusions in the cytoplasm
D. cells round up
E. All of the choices are correct.

All are correct

Uncoating of viral nucleic acid

Does not occur in bacteriophage multiplication.

Infectious protein particles are called


Infectious naked strands of RNA are called


Creutzfeld-Jacob disease is

"Mad Cow" Disease

Satellite viruses are

Dependent on other viruses for replication.

All of the following is correct about treating viral diseases except
A. viruses are killed by the same antibiotics that kill bacteria.
B. many antiviral drugs block viral replication.
C. many antiviral drugs cause severe side effects.
D. interferons show potential for treating and preventing viral infections.
E. All of the choices are correct.

Viruses are killed by the same antibiotics that kill bacteria.

The capsomers are made of


Viruses that consist of only a nucleocapsid are considered

Naked Viruses

The nucleocapsid consists of

The nucleic acid along with the capsid.

Which of the following parts of a virus is not always present?
A. envelope
B. nucleic acid
C. capsid
D. capsomers
E. None of the choices are optional parts of a virus.


Which of the following viruses did D. Ivanovski and M. Beijerinck work with?
A. rabies
B. smallpox
C. tobacco mosaic virus
D. herpes
E. Epstein-Barr virus

Tobacco Mosaic virus

Viruses belong to which of the following Kingdoms?
A. Protists
B. Fungi
C. Archaea
D. Bacteria
E. None of the choices are correct.

None are correct

Which body system is mainly affected by Creutzfeldt-Jakob disease?


When a virus enters a lysogenic phase, it means

The virus is integrated into the DNA of the host cell and is latent.

All of the following are characteristics of viruses except
A. they can be crystallized.
B. they often have a geometric capsid.
C. they have a viscous fluid inside their capsids.
D. they can cause fatal diseases.
E. they can cause mild diseases.

They have a viscous fluid inside their capsids

How do enveloped animal viruses exit their host?

Budding or exocytosis

Clostridium botulinum is made virulent by incorporated prophage genes encoding for the botulinum toxin. What term describes this process?

Lysogenic conversion

Viruses are ultramicroscopic because they range in size from 2 mm to 450 mm.
True False


Spikes are glycoproteins of the virus capsid.

True False


Prophages can be activated into viral replication and enter the lytic cycle.

True False


Viral infections are easier to treat with drugs than bacterial infections.

True False


The International Committee on Taxonomy of Viruses has determined that there are only three orders of viruses.

True False


Bacteriophages do not undergo adsorption to specific host cell receptors prior to penetration.

True False


When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell.

True False


Viral spikes are inserted into the host cell membrane before budding or exocytosis occurs.

True False


No cases of variant Creutzfeldt-Jakob syndrome linked to eating infected cows have occurred in the United States.

True False


The adeno-associated virus (AAV) and the delta agent are prions.

True False


A _____ is the protein shell around the nucleic acid core of a virus.


Viruses that infect bacteria are specifically called _____.


Diagnosis of viral infections sometimes involves analyzing the patient's blood for specific _____ that the immune system produced against the virus.


Two noncellular agents, smaller than viruses, are the infectious proteins called _____, and the infectious RNA strands called _____.

Prions, Virions

Viruses with _____ sense RNA contain the correct message for translation, while viruses with _____ sense RNA must first be converted into a correct message.

Positive, Negative

Freshly isolated animal tissue that is placed in a growth medium and allowed to produce a cell monolayer is referred to as a _____ cell culture.

In vitro

One of the principal capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as an _____ capsid.


A naked virus does not have an _____.


During lysogeny, an inactive prophage state occurs when the viral DNA is inserted into the _____ _____.

Bacterial chromosome

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.


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