Quiz Ch 20

Question 1

All antibiotics are considered either bacteriostatic or bactericidal

Answer 1

True

Question 2

Quionolones inhibit _____ _____ synthesis

Answer 2

nucleic; acid

Question 3

Most of the available antimicrobial agents are effective against

a. viruses
b. bacteria
c. fungi

Answer 3

b. bacteria

Question 4

The antibiotic tetracycline binds to the 30S subunit of the ribosome, as shown by the dark black bar on the right portion of the diagram in the figure below. The effect is to

a. prevent attachment of DNA
b. prevent peptide bond formation
c. stop the ribosome from moving along the mRNA
d. interfere with the attachment of tRNA to mRNA-ribosome complex

Answer 4

d. interfere with the attachment of tRNA to mRNA-ribosome complex

Question 5

All of the following methods of actions are bacteriostatic except:

a. competitive inhibition with folic acid synthesis
b. inhibition of protein synthesis
c. inhibition of cell wall synthesis
d. competitive inhibition with DNA gyrase

Answer 5

c. inhibition of cell wall synthesis

Question 6

Which of the following statements about antibiotics are FALSE?

a. They target both bacteria and viruses
b. Some target cell wall synthesis
c. Some target protein synthesis
d. Some target nucleic synthesis

Answer 6

a. They target both bacteria and viruses

Question 7

In the presence of penicillin, a cell dies because

a. it lacks a cell wall
b. it undergoes lysis
c. it lacks a cell membrane
d. it plasmolyzes

Answer 7

b. it undergoes lysis

Question 8

State whether each of these antibiotics are bactericidal or bacteriostatic

1. quinolones
2. chloramphenicol
3. penicillin
4. macrolides

Answer 8

1. bacteriostatic
2. bacteriostatic
3. bactericidal
4. bacteriostatic