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

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

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?

_______________ inhibit the growth of bacteria & ____________________ kill bacteria.