Most of the chromosomes in humans are sex chromosomes.

a. true
b. false


Ans: b. false

Biology & Microbiology

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In CAM plants, such as cacti, stomata are

a. open during the night and closed during the day. b. nearly always open. c. closed only when guard cells are not exposed to sunlight. d. almost never open. e. open during the day and closed during the night.

Biology & Microbiology

A milkweed plant discourages consumption by herbivores by

a. exuding a toxic sap. b. developing an appearance that mimics an undesirable plant. c. having hairy leaves. d. producing an undesirable scent. e. having thorns.

Biology & Microbiology

The large intestine begins as the

a. appendix. b. duodenum. c. ileum. d. cecum. e. jejunum.

Biology & Microbiology

The virulence factor associated with enterohemorrhagic Escherichia coli diarrhea resembles a virulence factor from which of the following bacteria?

A. Enterobacter aerogenes B. Klebsiella pneumoniae C. Salmonella typhi D. Shigella sonnei E. Vibrio cholera

Biology & Microbiology