The founder effect occurs when a small group of individuals start a new population that is not genetically representative of the original population.
a. true
b. false
Answer: a. true
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Obligate anaerobes are usually poisoned by molecular oxygen but may grow in aerobic habitats if associated with facultative anaerobes that use up all available oxygen.
Answer the following statement true (T) or false (F)
Human cells produce perhaps as many as 100,000 different proteins, and yet the human genome has
only about 20,000 genes. This is best explained by
a. aminoacylation. b. exon shuffling. c. the wobble hypothesis. d. degeneracy. e. alternative splicing.
Pleiotropic genes
a. act on secondary sexual characteristics. b. influence more than one aspect of phenotype. c. are additive. d. produce lethal effects when homozygous. e. are none of these.
Which of the following is an example of an exotoxin?
A) neurotoxin B) coagulase C) lipid A D) streptokinase E) collagenase