Lecture 1 and 2 quiz Flashcards
Which of the following terms describes the protein shell that surrounds the viral genome?
capsomere
virion
capsid
envelope
matrix
capsid
Viruses play a major role in the ecology of the ocean by doing which of the following?
By lysing unicellular organisms and releasing carbon and oxygen back into the ocean.
By infecting photosynthetic bacteria and increasing their growth.
All of the above statements are correct.
By killing off fish and preventing them from becoming too plentiful.
By infecting harmful bacteria found in the ocean and limiting their growth.
By lysing unicellular organisms and releasing carbon and oxygen back into the ocean.
If you wanted to show that an infectious agent is a virus, what experiment could you do?
Show that the agent can pass through a porcelain filter and is still infectious.
Show that agent contains a lipid membrane.
Show that the agent can be seen under a light microscope.
Show that the agent can be diluted and can still cause disease in an animal.
Show that the agent can form single colonies on an agar plate.
Show that the agent can pass through a porcelain filter and is still infectious.
What does the word “virus” mean in Latin?
death
liquid
infectious agent
disease
poison
poison
The word “phage” is a shortened version of the name of a virus that can infect which type of organism?
human cell
insect cell
bacterial cell
plant cell
eukaryotic cell
bacterial cell
Which of the following processes in cells was NOT discovered by studying a virus?
DNA replication in both prokaryotic and eukaryotic cells
regulation of gene expression in eukaryotic cells.
the sequence of the genetic code.
mRNA splicing in eukaryotic cells
DNA is the genetic material
the sequence of the genetic code.
The lipid membrane that surrounds the nucleocapsid of some virus particles is called the:
matrix
tegument
envelope
glycoprotein
capsid
envelope
The nucleocapsid describes the structure that includes the:
envelope and the glycoproteins
capsid and the genome
helical capsid and an envelope
capsid and the envelope
icosahedral capsid and an envelope
capsid and the genome
Depending on the type of virus, which of the following is a function of the virus capsid?
To ensure delivery of the genome into the host cell.
To protect the viral genome from nucleases.
To protect the viral genome from damage by UV light.
All of the above functions are correct.
To attach to the correct type of host cell.
All of the above functions are correct.
Most viruses that use a spherical shaped capsid arrange their capsid proteins with which of the following symmetries?
dodecagon
tetrahedral
cubic
helical
icosahedral
icosahedral
Which of the following is NOT a characteristic of a regular icosahedron?
It has 20 sides with 3-fold symmetry.
It has 12 vertices of 5-fold symmetry.
It has 20 triangular faces.
It has 6 square faces.
It has 30 edges with 2-fold symmetry
It has 6 square faces.
How many copies of the capsid protein would there be in an icosahedral capsid with a Triangulation number of 7?
420
Which of the following h and k values will produce a triangulation number of 13?
1 and 3
2 and 4
2 and 3
1 and 2
1 and 1
1 and 3
Which of the following describes the number of subunits per turn in a helical capsid?
m (mu)
r (rho)
Triangulation number
P (pitch)
symmetry
m (mu)
What does the term “quasi-equivalent” mean with respect to the proteins in an icosahedral capsid?
There can be more than one type of glycoprotein in the envelope.
All of the proteins interact in a 5-fold arrangement.
They all use the “jelly-roll” protein structure.
There are different proteins in the capsid with similiar shapes.
If the identical protein is used, it has both 5-fold and 6-fold interactions with the other proteins in the capsid.
If the identical protein is used, it has both 5-fold and 6-fold interactions with the other proteins in the capsid.
