A nonsense mutation is a base-pair substitution that results in the replacement of one amino acid with
another.
__________________ Indicate whether the statement is true or false.
F, missense
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Materials move most slowly through the:
a. colon b. duodenum c. esophagus d. jejunum e. stomach
Atria differ from ventricles in that they
a. are larger. b. have thicker walls with more muscle. c. receive blood from veins. d. have a higher blood pressure. e. empty through semilunar valves.
Cadherins are responsible for Ca++-dependent interactions between connexin proteins.
a. true b. false
Which is an example of temporal isolation?
A. two plant species have incompatible gametes. B. one plant species is pollinated by bees and a second plant species is pollinated by moths. C. two plant species live on the same mountainside, but one lives on rocky outcrops and the other in open meadows. D. one plant species blooms in June-July and a second plant species blooms in August-September.