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.
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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
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
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.
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.