Question 1

Depending on the type of virus, which of the following is a function of the virus capsid?

Accepted Answer

A)  To attach to the correct type of host cell. 
B)  To protect the viral genome from nucleases. 
C)  To ensure delivery of the genome into the host cell. 
D)  To protect the viral genome from damage by UV light. 
E)  All of the above functions are correct.

Question 2

Which of the following is NOT a characteristic of a regular icosahedron?

Accepted Answer

A)  It has 12 vertices of 5-fold symmetry. 
B)  It has 20 triangular faces. 
C)  It has 20 sides with 3-fold symmetry. 
D)  It has 30 edges with 2-fold symmetry 
E)  It has 6 square faces.

Question 3

How many copies of the capsid protein would there be in an icosahedral capsid with a Triangulation number of 7?

Accepted Answer

A)  70 
B)  210 
C)  280 
D)  420 
E)  490

Question 4

The lipid membrane that surrounds the nucleocapsid of some virus particles is called the:

Accepted Answer

A)  matrix 
B)  tegument 
C)  capsid 
D)  envelope 
E)  glycoprotein

Exam 2: Virus Structure and Assembly

Depending on the type of virus, which of the following is a function of the virus capsid?

Which of the following is NOT a characteristic of a regular icosahedron?

How many copies of the capsid protein would there be in an icosahedral capsid with a Triangulation number of 7?

The lipid membrane that surrounds the nucleocapsid of some virus particles is called the: