Introduction to Virology & Virus Structure (PART I)
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40 Terms
True or False: Viruses are extremely small ranging from 20 to 300 nm.
True
1 multiple choice option
What is the genetic material of viruses?
Both RNA or DNA
3 multiple choice options
Which statement best describes viral structure?
Simple repeating subunits arranged in patterns
3 multiple choice options
True or False: A virus can contain BOTH DNA and RNA.
False
1 multiple choice option
True or False: Viruses use inert metabolism that produces energy.
False
1 multiple choice option
The genome of a virus can consist of 3-300 ______________ bases.
Thousand
3 multiple choice options
True or False: The absolute requirement for viruses is that it needs to enter the host cell to replicate. It cannot grow in "defined media" and replicate in food or environment.
True
1 multiple choice option
________________ is an obligate intracellular parasite that contains DNA or RNA but not both.
Virus
3 multiple choice options
True or False: The use of RNA is limited to viruses and bacteria.
False
1 multiple choice option
How many types of nucleic acids are used in the genome of viruses?
Only one type
3 multiple choice options
All viruses use ___________ for protein synthesis inside the cell.
ss mRNA
3 multiple choice options
For viruses that use __________ as both genome and messenger, the genome can act as both.
ssRNA
3 multiple choice options
Most viruses generally have __________ genes present.
7-8
3 multiple choice options
The __________ structure refers to the arrangement of repeating protein subunits that make up the viral capsid.
Capsomeric
3 multiple choice options
Adenovirus is a classic example of a virus with a prominent __________ structure.
Capsomeric
3 multiple choice options
In Poliovirus, the capsomers are very __________-fitting.
Close
3 multiple choice options
What is the primary function of the viral capsid?
Protection of the viral nucleic acid
3 multiple choice options
Different proteins come together to form a protective coat around viral __________ material.
Genetic
3 multiple choice options
True or False: The viral capsid protects either RNA or DNA depending on the virus.
True
1 multiple choice option
True or False: Viruses contain organelles.
False
1 multiple choice option
Viruses use the host cell's __________ systems for replication and survival.
Metabolic
3 multiple choice options
During viral replication, __________ components appear within the infected cell before new viruses are assembled.
Preformed
3 multiple choice options
What happens before complete viral particles are assembled?
Preformed viral components accumulate in infected cell
3 multiple choice options
Which of the following are the major components of a virus?
DNA/RNA and a protein coat
3 multiple choice options
True or False: Enveloped viruses are more sensitive than naked viruses as it becomes inactivated if affected/damaged.
True
1 multiple choice option
The protein coat surrounding a virus is called the __________.
Capsid
3 multiple choice options
True or False: The capsid surrounds and protects viral nucleic acid.
True
1 multiple choice option
Capsid proteins are the __________ components of the viral capsid.
Structural
3 multiple choice options
True or False: Capsid proteins help determine viral morphology and symmetry.
True
1 multiple choice option
Which structures can be formed by capsid proteins?
Icosahedral, helical, and complex structures
3 multiple choice options
In naked viruses, capsid proteins help deliver viral nucleic acid into the __________ cell.
Host
3 multiple choice options
True or False: Naked viruses use capsid proteins to attach to host-cell receptors.
True
1 multiple choice option
How do naked viruses typically attach to host cells?
Via capsid proteins binding to receptors
3 multiple choice options
Protein domains on some viruses fuse with the host membrane to allow viral __________.
Entry
3 multiple choice options
True or False: Fusion of viral protein domains with host membranes can facilitate viral entry.
True
1 multiple choice option
Which viral structure commonly contains protein domains involved in attachment and fusion in enveloped viruses?
Envelope
3 multiple choice options
Which viral symmetry type is considered extremely stable and environmentally resistant?
Icosahedral
3 multiple choice options
How many vertices does an icosahedron possess?
12
3 multiple choice options
An icosahedron contains __________ triangular sides called facets.
20
3 multiple choice options
True or False: Icosahedral capsids are composed of capsomers.
True
1 multiple choice option