Immune system Qs 17-25

Question 1

Lymphhocytes acquire their antigen specificity:

Answer 1

Before they encounter antigen.

Question 2

A secondary immune response is NOT:

Answer 2

Preceded by a longer lag period than a primary response.

Question 3

Antibody effector functions include all of the following except:

Answer 3

Binding intracellular viruses to innate cytotoxicity.

Question 4

Effector functions of complement include all of the following except:

Answer 4

Presenting of antigen to B cells.

Question 5

Jenner observed that milkmaids who were infected with cowpox were later immune to smallpox infections. This is an example of a:

Answer 5

Memory response to a cross-reactive antigen.

Question 6

Macrophages generally kill the bacteria they phagocytose by fusing lysosomes containing digestive enzymes with the phagocytic vesicle. In the case of pathogens which block this fusion, pathogen killing can still be achieved through the effector function of:

Answer 6

Th1 cells

Question 7

Phagocytosis:

Answer 7

Can be stimulated by antigen binding to complement or antibody.

Question 8

Several friends who went on a picnic together developed vomiting and diarrhoea from eating potato salad contaminated with St. aureus enterotoxin. Effects from the toxin could best be counteracted by:

Answer 8

Antibody binding and neutralizing of the toxin.

Question 9

Which of the following statements is false?

Answer 9

The innate immune system does not deal with endogenous antigen.