11. Controlling Microbial Growth

_______________ inhibit the growth of bacteria & ____________________ kill bacteria.

Use the following information to answer questions 6 and 7. The data were obtained from a use-

dilution test comparing four disinfectants against Salmonella Choleraesuis.

G = growth, NG = no growth <IMAGE>

Which disinfectant is the most effective?

Use the following information to answer questions 6 and 7. The data were obtained from a use-

dilution test comparing four disinfectants against Salmonella Choleraesuis.

G = growth, NG = no growth <IMAGE>

Which disinfectant(s) is (are) bactericidal?

a. A,B,C, and D

b. A,C, and D

c. A only

d. B only

e. none of the above

All of the following are modes of action of antiviral drugs except

a. inhibition of protein synthesis at 70S ribosomes.

b. inhibition of DNA synthesis.

c. inhibition of RNA synthesis.

d. inhibition of uncoating.

e. All of the above are modes of action of antiviral drugs.

A drug that intercalates into DNA has the following effects. Which one leads to the others?

a. It disrupts transcription.

b. It disrupts translation.

c. It interferes with DNA replication.

d. It causes mutations.

e. It alters proteins.

Chloramphenicol binds to the 50S portion of a ribosome, which will interfere with

a. transcription in prokaryotic cells.

b. transcription in eukaryotic cells.

c. translation in prokaryotic cells.

d. translation in eukaryotic cells.

e. DNA synthesis.

Use the following choices to answer questions 6–8:

a. candidiasis

b. bacterial vaginosis

c. genital herpes

d. lymphogranuloma venereum

e. trichomoniasis

Difficult to treat with chemotherapy

Which of the following chemicals is active against bacterial endospores?

a. copper ions

b. ethylene oxide

c. ethanol

d. triclosan

A company that manufactures an antimicrobial cleaner for kitchen counters claims that its product is effective when used in a 50% water solution. By what means might scientists best verify this statement?

a. disk-diffusion test

b. phenol coefficient

c. filter paper test

d. in-use test

How does a chemostat maintain a constant population size?

Which of the following terms best describes the disinfecting of cafeteria plates?

a. pasteurization

b. antisepsis

c. sterilization

d. sanitization

Why do warm disinfectant chemicals generally work better than cool ones?