BI 234 LECTURE 4 PRIONS & VIRUSES EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++
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Course
BI 234
Institution
BI 234
BI 234 LECTURE 4 PRIONS & VIRUSES EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++
What is a virus?
A virus is a set of information that can reprogram a cell to transmit the information to another cell
What is the physical form of information in a cell?
-Nucleic acids= RNA and DN...
A virus is a set of information that can reprogram a cell to transmit the information to
another cell
What is the physical form of information in a cell?
-Nucleic acids= RNA and DNA
Is a virion the most important part of a virus?
No
Are viruses similar to bacteria or other cells?
No
What part is a virion?
The infective particle
What did virions used to be called historically?
Virus particles
What is the function/job of a virion?
to move the nucleic acid (DNA/RNA) to a new host cell
What are two nucleic acids?
DNA and RNA
,Does the nucleic acid by itself have everything it needs to reprogram the host
cell?
Yes
What does the nucleic acid need besides itself to reprogram a host cell?
Nothing
What typically directs the actions of a cell?
Cell's DNA
What will make new virions?
The host cell
Where does most of the activity of a virus happen?
-In the host cell after the virion has been broken down and has released its nucleic acid.
(-The nucleic acid forces the host cell to stop it's normal activities
-then forces it to make new copies of the virion parts
-then it forces the cell to assemble these into fully mature/full sized new virions)
A virion is like a ____
Plant seed
Why is a virion like a plant seed?
-A plant seed contains the genetic information that encodes everything about the entire
organism
-A plant seed's only job is to passively drift until it lands in a good place, then transform
into a new plant (which means that it's cells multiply and divide many times to make the
cells of the new plant)
, What is a virion?
The physical structures with proteins, nucleic acids, and lipids that viruses used to move
between host cells
To understand viruses, we must understand ____
Virions
What happens to a new host cell when a virion finds it?
The new host cell becomes a virion factory
(-Makes viral regulatory proteins
-Must make all of the virion parts)
What parts do all virions have?
-Nucleic acid
-capsid
-Spike proteins
Explain the spike proteins of a virion
-involved in attaching to host cells; critically important
-They are the virion's only hope of entering a host cell
-They are what human immune system's used to quickly neutralize viral infections
What do human immune systems use to most quickly neutralize viral infections?
Spike proteins
What is a capsid?
Protein shell made of capsomere proteins
What do capsids do?
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