The process by which a nontoxigenic Corynebacterium diphtheriae cell is changed into a toxigenic cell is called:

A) conjugation.
B) lysogenic conversion.
C) transduction.
D) transformation.


B) lysogenic conversion.

Biology & Microbiology

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Due to high rates of water loss, all woody plants must produce more of which type of tissue?

A. secondary xylem B. secondary phloem C. cork D. bark

Biology & Microbiology

51. The three major components in a nucleotide are

A. a carboxyl group, an R group, and an amino group. B. glucose, a nitrogen base, and a phosphate group. C. a nitrogen base, a six-carbon sugar, and a phosphate group. D. a nitrogen base, a five-carbon sugar, and a phosphate group. E. glucose, a fatty acid, and glycerol.

Biology & Microbiology

How is sexual reproduction different from asexual reproduction?

A. Sexual reproduction occurs with only a single parent. B. Asexual reproduction requires testes and ovaries. C. Sexual reproduction requires fertilization of an egg by a sperm. D. Asexual reproduction requires two kinds of cell division.

Biology & Microbiology

If all of the tertiary consumers were removed from an environment, the associated food web (and thus the carbon cycle) would collapse

A. true B. false

Biology & Microbiology