Phenolics act on microbes by

A) Dissolving membrane lipids
B) Denaturing proteins and disrupting cell membranes
C) Oxidizing cellular constituents
D) Precipitate cell proteins


Ans: B) Denaturing proteins and disrupting cell membranes

Biology & Microbiology

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E. coli, a protozoan that ranges from 15 to 25 µm in diameter, can contain up to eight nuclei in mature cysts. How would the karyosome expect to appear on a stained slide?

a. Small, usually compact b. Large, usually compact c. Small, irregularly shaped d. Large, not compact

Biology & Microbiology

Each of the following is true regarding bacterial anoxygenic photosynthesis except

A) O2 is released. B) Hydrogen sulfide or thiosulfate can act as electron donors. C) Bacteriochlorophyll b absorbs light energy in the far red range of the light spectrum. D) Electron flow is coupled to unidirectional proton pumping across the bacterial plasma membrane. E) Following electron flow, the electron is transferred from cytochrome c to bacteriochlorophyll b.

Biology & Microbiology

A (missense/nonsense/silent) mutation of a gene usually produces a nonfunctional polypeptide

What will be an ideal response?

Biology & Microbiology

The significance of the Miller–Urey experiment is:

a. that conditions on Earth 4 billion years ago could produce RNA. b. that it is possible to produce LUCA in the laboratory. c. that conditions on Earth 4 billion years ago could produce amino acids. d. that it is possible to produce DNA under the same conditions as on Earth 4 billion years ago.

Biology & Microbiology