Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes). Among the halophiles, mannitol fermenters release acid that turns the pH indicator yellow; mannitol nonfermenters leave the medium red. Onto MSA you inoculate a halophilic mannitol fermenter, a nonhalophilic mannitol fermenter, and a halophilic mannitol nonfermenter. Thus, the medium is acting as a ________ medium.

A. differential
B. selective
C. selective and differential
D. neither selective nor differential


Answer: C

Biology & Microbiology

You might also like to view...

In enzyme-catalyzed reactions, substrate is

synonymous with a. end products. b. by-products. c. intermediates. d. reactants. e. co-enzyme.

Biology & Microbiology

Which of the following allocates the greatest amount of biomass to photosynthetic tissue and the least amount to supportive tissue?

A) trees B) shrubs C) lianas D) grasses

Biology & Microbiology

What are the differences between complete dominance and codominance?

What will be an ideal response?

Biology & Microbiology

Transcription of a part of DNA molecule with a nucleotide sequence of A-A-A-C-A-A-C-T-T results in a mRNA molecule with the complementary sequence of

A. G-G-G-A-G-A-A-C-C B. U-U-U-C-U-U-C-A-A C. U-U-U-G-U-U-G-A-A D. T-T-T-G-A-A-G-C-C E. C-C-C-A-C-C-T-C-C F. None of these choices are correct

Biology & Microbiology