week 11 quiz

  Correct answers are hidden.

Submitted Jun 22 at 6:59pm

 

Question 1

1 / 1 pts

A patient is bitten by a dog with confirmed rabies infection. After treating the bite wound, the physician injects the patient with antibodies that are specific for the rabies virus to prevent the development of an active infection. This is an example of:

  

Natural active immunity

 

  

Artificial active immunity

 

  

Natural passive immunity

 

  

Artificial passive immunity

 

 

Question 2

1 / 1 pts

A patient gets a cold, and recovers a few days later. The patient's classmates come down with the same cold roughly a week later, but the original patient does not get the same cold again. This is an example of:

  

Natural active immunity

 

  

Artificial active immunity

 

  

Natural passive immunity

 

  

Artificial passive immunity

 

 

Question 3

1 / 1 pts

Subunit vaccines do not provide protection against antigenic variation.

  

True

 

  

False

 

 

Question 4

1 / 1 pts

After exposure to a protein antigen, antibodies will be immediately detectable in an individual’s serum.

  

True

 

  

False

 

 

Question 5

1 / 1 pts

Match the example to the type of immunity being acquired:

Being ill and recovering from an infection

 

               Natural active             

Blood transfusion from someone previously infected with a pathogen

 

               Artifical passive             

Breastfeeding

 

               Natural passive             

Receiving a vaccine

 

               Artificial active             

 

Question 6

1 / 1 pts

Match the type of vaccine to its proper description:

inactivated whole pathogen vaccine

 

               killed or otherwise nonfunctional pathogen             

live attenuated pathogen vaccine

 

               weakened pathogen             

subunit vaccine

 

               immunogenic antigen of the pathogen             

 

Question 7

1 / 1 pts

________ involves the binding of antibodies to epitopes on the surface of viruses to inhibit attachment and entry to host cells.

 

Question 8

1 / 1 pts

________ is a reduction in disease prevalence brought about when relatively few individuals in a population are susceptible to an infectious agent.

 

Question 9

1 / 1 pts

Eukaryotes are distinct from prokaryotes when it comes to DNA. Which of the following is correct?

SELECT ALL THAT APPLY

  

A) Eukaryotic DNA is circular and uses only one origin of replication

 

  

B) Prokaryotic DNA comprises 1 major chromosome and smaller circular plasmids

 

  

C) Eukaryotic DNA is linear

 

  

D) Both prokaryotic and eukaryotic DNA is important for gene expression

 

 

Question 10

1 / 1 pts

B cells and T cells come from the same parent cell and are both lymphocytes. They have different functions because…

  

A) their DNA is distinct

 

  

B) their cell walls are distinct

 

  

C) their proteins are distinct

 

  

D) none of the above

 

 

Question 11

1 / 1 pts

Fill in the blanks to describe how antigen presentation occurs from a cell infected with a virus:

Viruses are _____ pathogens. Viral proteins are therefore produced by host ribosomes and presented by ____ to T cells.

  

A) Intracellular; MHC I

 

  

B) Extracellular; MHC II

 

  

C) Intracellular; TCRs

 

  

D) Extracellular; MHC I

 

 

Question 12

1 / 1 pts

Match the antibody class with its description:

This class of antibody is the only one that can cross the placenta.

 

               IgG             

This class of antibody is the first to appear after activation of B cells.

 

               IgM             

This class of antibody is found in very large amounts in mucus secretions.

 

               IgA             

 

IncorrectQuestion 13

0 / 1 pts

Which of the following correctly describes the process for activated B cells producing different antibody types with the same antigen specificity?

  

A) Affinity maturation happens when the Fab region gets better and better at binding antigen

 

  

B) Class switching happens when the Fab region gets better and better at binding antigen

 

  

C) Affinity maturation happens when the Fc region of an antibody changes but the Fab region stays constant

 

  

D) Class switching happens when the Fc region of an antibody changes but the Fab region stays constant

 

 

IncorrectQuestion 14

0 / 1 pts

Which of the following is true regarding where innate and adaptive immunity work together?

  

A) antibodies activate T and B cells

 

  

B) NK cells recognize antibody-bound pathogens and “eat” them via ADCC

 

  

C) APC cells recognize antibody-bound pathogens and destroy them via MAC

 

  

D) The classical pathway of the complement system combines the innate and adaptive arms

 

 

Question 15

1 / 1 pts

How do our cells know when another cell is infected with a virus?

SELECT ALL THAT APPLY

  

A) NK cells kill infected host cells that have lost their MHC I receptors.

 

  

B) Infected host cells use intracellular PRRs to produce interferon signals to warn their neighbor cells.

 

  

C) Cytotoxic T cells bind MHC I showing viral antigens on infected host cells.

 

  

D) Antibodies bind to viral antigens on MHC I and recruit immune cells to kill infected host cells.

 

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