Which of the following skin defenses and its mechanism is mismatched?

A. Lysozyme; hydrolyzes peptidoglycan in bacterial cell walls
B. Keratinized surface; protein that provides waterproofing
C. Antimicrobial peptides; disrupt positively charged bacterial membranes
D. Sebum; lipid hydrolysis leads to toxic by-products that inhibit microbial growth


Answer: C

Biology & Microbiology

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Crabs and terrapins have a _____ impact on snail populations while snails have a _____ impact on

cordgrass populations and terrapins have a _____ impact on cordgrass populations.

a. negative; negative; negative b. negative; negative; positive c. negative; positive; negative d. positive; negative; positive e. positive; positive; positive

Biology & Microbiology

A chromosome’s gene sequence that was ABCDEFG

before modification and ABCDLMNOP afterward is an example of a. inversion. b. deletion. c. duplication. d. translocation. e. aneuploidy.

Biology & Microbiology

The plant physiologist F. C. Steward demonstrated that:a

the preprophase band is important in plant cell division. b. orchids can be generated from pollen grains. c. an entire plant can be generated from a single callus cell. d. the monopteros gene codes for a transcription factor. e. the shoot apical meristem gives rise to leaf and bud primordia.

Biology & Microbiology

Which step in making beer involves soaking malt grain, grinding it, and heating with sugar and starch?

A. Wort boiled with hops B. Malting C. Preparing a mash D. Fermentation E. Aging

Biology & Microbiology