Viruses have all the following except |
B. Metabolism |
Host cells of viruses include |
E. All of the choices are correct |
Viruses |
A. Cannot be seen in a light microscope |
Virus capsids are made from subunits called |
C. Capsomeres |
Helical and icosahedral are terms used to describe the shapes of a virus |
D. Capsid |
A _____ is the protein shell around the nucleic acid core of a virus. |
B. Capsid |
One of the principal capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a(n) _____ capsid. |
C. Icosahedral |
A naked virus only has a(n) |
C. Nucleocapsid |
Which of the following is not a typical capsid shape? |
A. Tetrahedral |
All of the following pertain to virus envelopes except |
E. Located between the capsid and nucleic acid |
Viral spikes |
B. Bind viral capsid and envelope together |
The core of every virus particle always contains |
E. Either DNA or RNA |
Which of the following is not associated with every virus? |
A. Envelope |
Viral nucleic acids include which of the following |
E. All of the choices are correct |
Reverse transcriptase synthesizes |
E. None of the choices are correct |
A negative RNA virus must first |
C. Synthesize a positive RNA copy of its genome. |
Viruses with _____ sense RNA contain the correct message for translation, while viruses with _____ sense RNA must first be converted into a correct message. |
A. Positive, negative |
Classification of viruses into families involves determining all the following characteristics except |
D. Biochemical reactions |
Which of the following represents a virus family name? |
B. Herpesviridae |
Which of the following is not a viral order in the classification system? |
B. Vaccinia virus |
The correct sequence of events in viral multiplication is |
C. Adsorption, penetration, uncoating, synthesis, assembly, release |
Viruses acquire envelopes around their nucleocapsids during |
D. Release |
In general, most DNA viruses multiply in the host cell’s _____, while most RNA viruses multiply in the host cell’s _____. |
A. Nucleus, cytoplasm |
Host range is limited by |
C. Type of host cell receptors on cell membrane |
Oncogenic viruses include all the following except |
B. Measles virus |
Which of the following is a type of cytopathic effect? |
E. All of the choices are correct |
The envelope of enveloped viruses is |
D. Is obtained by viral budding or exocytosis |
Viruses attach to their hosts via |
A. Host glycoproteins |
Viral tissue specificities are called |
D. Tropisms |
The process of dissolving the envelope and capsid to release the viral nucleic acid is |
C. Uncoating |
Which of the following occurs during assembly? |
E. Only choices A and C occur |
Mammalian viruses capable of starting tumors are |
B. Oncoviruses |
Persistent viruses that can reactivate periodically are |
A. Chronic latent viruses |
Which of the following is not a characteristic of a transformed cell? |
B. Decreased growth rate |
New, nonenveloped virus release occurs by |
A. Lysis |
What structures are used by bacteriophages to attach to host cell receptors? |
B. Tail fibers |
Which of the following is incorrect about prophages? |
D. Cause lysis of host cells |
T-even phages |
B. Infect Esherichia coli cells |
The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is |
B. Injection of only the viral nucleic acid into the host cell |
Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called |
A. Latent |
Uncoating of viral nucleic acid |
E. All of the choices are correct |
In transduction, the viral genome |
B. Includes DNA from the previous host |
Lysogeny refers to |
D. Viral genome inserting into bacterial host chromosome |
Viruses that infect bacteria are specifically called |
C. Bacteriophages |
During lysogeny, an inactive prophage state occurs when the viral DNA is inserted into the |
D. Host DNA |
What type of phage enters an inactive prophage stage? |
C. Temperate |
The activation of a prophage is called |
D. Induction |
When a bacterium acquires a trait from its temperate phage, it is called |
B. Lysogenic conversion |
In which stage of the multiplication cycle of T-even phages are the phages developing and are not yet infectious? |
C. Eclipse |
Which of the following will not support viral cultivation? |
E. All of the choices will support viral cultivation |
Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called |
C. Plaques |
Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called |
E. Pocks |
Cells grown in culture form a(n) |
A. Monolayer |
Diagnosis of viral infections sometimes involves analyzing the patient’s blood for specific _____ that the immune system produced against the virus. |
B. Antibodies |
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. |
B. Primary |
A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures. |
B. Cell |
Infectious protein particles are called |
C. Prions |
Infectious naked strands of RNA that affect plants are called |
A. Viroids |
Creutzfeld-Jacob disease is |
D. A spongiform encephalopathy of humans |
Satellite viruses are |
B. Dependent on other viruses for replication |
Two noncellular agents, smaller than viruses, are the infectious proteins called _____ and the infectious RNA strands called _____. |
E. Prions, viroids |
Who developed a rabies vaccine by separating bacteria from virus using a filter? |
C. Pasteur |
The primary purposes of viral cultivation are: |
D. All of these |
When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell. True or False |
True |
Viruses are used to produce vaccines for prevention of certain viral infections. True or False |
True |
Viruses are ultramicroscopic because they range in size from 2 mm to 450 mm. True or False |
False |
A fully formed virus that can cause an infection in a host cell is called a virion. True or False |
True |
Spikes are glycoproteins of the virus capsid. True or False |
True |
Each virus is assigned to genus status based on its host, target tissue and type of disease it causes. True or False |
False |
A specific animal virus has the ability to attach to and enter almost any animal host cell. True or False |
False |
Viral spikes are inserted into the host cell membrane before budding or exocytosis. True or False |
True |
Prophages can be activated into viral replication and enter the lytic cycle. True or False |
True |
Bacteriophages do not undergo adsorption to specific host cell receptors prior to penetration. True or False |
False |
Viruses are the most common cause of acute infections that do not result in hospitalization. True or False |
True |
The adeno-associated virus (AAV) and the delta agent are prions. True or False |
False |
Viruses are simple, non-cellular and lack mRNA. True or False |
True |
Viruses mutate and some have not been discovered. True or False |
True |
Viruses are not filterable. True or False |
False |
Viruses are unable to multiple outside of a host cell. True or False |
True |
Micro Chap 6
Share This
Unfinished tasks keep piling up?
Let us complete them for you. Quickly and professionally.
Check Price