CH 16 EOC multiple choice

Legionella uses C3b receptors to enter monocytes. This:

a. Prevents phagocytosis

b. Degrades complement

.c. Inactivates complement

.d. Prevents inflammation.

e. Prevents cytolysis.

Prevents phagocytosis

Chlamydia can prevent the formation of phagolysosomes and therefore can:

a. Avoid being phagocytosed.

b. Avoid destruction by complement.

c. Prevent adherence.

d. Avoid being digested.

e. None of the above.

Avoid being digested.

If the following are placed in the order of occurrence, which would be the third step?

a. Diapedesis.

b. Digestion

.c. Formation of a phagosome.

d. Formation of a phagolysosome.

e. Margination.

Formation of a phagosome.

If the following are placed in the order of occurrence, which would be the third step?

a. Activation of C5 through C9.

b. Cell lysis.

c. Antigen-antibody reaction.

d. Activation of C3.

e. Activation of C2 through C4.

Activation of C3.

A decrease in the production of C3 would result in:

a. Increased susceptibility to infection.

b. Increased numbers of white blood cells.

c. Increased phagocytosis.

d. Activation of C5 through C9.

e. None of the above.

Increased susceptibility to infection.

In 1884, Elie Metchnikoff observed blood cells collected around a splinter inserted in a sea star embryo. This was the discovery of:

a. Blood cells.

b. Sea stars.

c. Phagocytosis.

d. Immunity.

e. None of the above.

Phagocytosis.

Helicobacter pylori uses the enzyme urease to counteract a chemical defense in the human organ in which it lives. This chemical defense is

:a. Lysozyme.

b. Hydrochloric acid

.c.Superoxide Radicals

.d. Sebum

.e. None of the above.

Hydrochloric acid

Which of the following statements about IFN- (alpha) is false?

a. It interferes with viral replication.

b. It is host-cell-specific.

c. It is released by fibroblasts.

d. It is virus-specific

.e. It is released by lymphocytes.

It is virus-specific

Which of the following does not stimulate phagocytes?

a. Cytokines

.b. IFN-y (gamma?)

c. C3b

d. Lipid A

e. Histamin

Histamin

A human host can prevent a pathogen from getting enough iron by:

a. Reducing dietary intake if iron.

b. Binding iron with transferrin.

c. Binding iron with hemoglobin.

d. Excreting excess iron

.e. Binding iron with siderophores.

Binding iron with siderophores.

NAME IT These agranulocytes are not phagocytic until they wander out of the blood.

Monocyte (Macrophage)