Nester's Microbiology: A Human Perspective

Denise Anderson, Sarah Salm, Deborah Allen

Chapter 16

Host-Microbe Interactions - all with Video Answers

Educators

Chapter Questions

Problem 1

Opportunistic pathogens are least likely to affect which of the following groups?
a) AIDS patients
b) Cancer patients
c) College students
d) Drug addicts
e) Transplant recipients

Eleanor Behling

Eleanor Behling

Numerade Educator

Problem 2

Capsules and M protein are thought to interfere with which of the following?
a) Opsonization by complement proteins
b) Opsonization by antibodies
c) Recognition by T cells
d) Recognition by B cells
e) Phagosome-lysosome fusion

Eleanor Behling

Eleanor Behling

Numerade Educator

Problem 3

The CSa peptidase enzyme of Streptococcus pyogenes breaks down C5a, resulting in
a) lysis of the Streptococcus cells.
b) lack of opsonization of Streptococcus cells.
c) killing of phagocytes.
d) decreased accumulation of phagocytes.
e) inhibition of membrane attack complexes.

Eleanor Behling

Eleanor Behling

Numerade Educator

Problem 4

All of the following are known mechanisms of avoiding the effects of antibodies except
a) antigenic variation.
b) mimicking "self."
c) synthesis of an Fc receptor.
d) synthesis of IgG protease.
e) remaining intracellular.

Eleanor Behling

Eleanor Behling

Numerade Educator

Problem 5

Which of the following statements about diphtheria toxin is false? It
a) is an example of an endotoxin.
b) is produced by a species of Corynebacterium.
c) inhibits protein synthesis.
d) can cause local damage to the throat.
e) can cause systemic damage (that is, to organs such as the heart).

Eleanor Behling

Eleanor Behling

Numerade Educator

Problem 6

Which of the following statements about botulism is true?
a) It is caused by Bacillus botulinum, an obligate aerobe.
b) The toxin is heat-resistant, withstanding temperatures of $100^{\circ} \mathrm{C}$
c) The organism that causes botulism can cause disease without encountering the immune response.
d) Vaccinations are routinely given to prevent botulism.
e) Symptoms of botulism include uncontrolled contraction of muscles.

Eleanor Behling

Eleanor Behling

Numerade Educator

Problem 7

Superantigens
a) are exceptionally large antigen molecules.
b) cause a very large antibody response.
c) elicit a response from a large number of T cells.
d) attach non-specifically to B-cell receptors.
e) assist in a protective immune response.

Eleanor Behling

Eleanor Behling

Numerade Educator

Problem 8

Which of the following statements about endotoxin is true? It
a) is an example of an A-B toxin.
b) is a component Gram-positive bacteria.
c) can be converted to a toxoid.
d) is heat-stable.
e) causes T cells to release cytokines.

Eleanor Behling

Eleanor Behling

Numerade Educator

Problem 9

The tissue damage caused by Neisseria gonorrhoeae is primarily due to
a) cross-reactive antibodies.
b) exotoxins.
c) hydrolytic enzymes.
d) the inflammatory response.
e) all of the these.

Eleanor Behling

Eleanor Behling

Numerade Educator

Problem 10

Which of the following statements about viruses is false? They may
a) colonize the skin.
b) enter host cells by endocytosis.
c) enter host cells by fusion of the viral envelope with the cell membrane.
d) induce apoptosis in infected host cells.
e) suppress expression of MHC class I molecules on host cells.

Eleanor Behling

Eleanor Behling

Numerade Educator