Which of these mechanisms is a postzygotic barrier to reproduction?
a. interbreeding
b. hybrid sterility
c. habitat isolation
d. behavioral isolation
e. mechanical isolation
ANSWER: b
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How many subunits make up a G protein?
A. two B. three C. four D. The number is variable.
Tetrapods colonized land at about the same time as the early _____ radiations around _____ million years ago
A. plant; 575 B. hemichordate; 542 C. arthropod; 420 D. insect; 360 E. plant; 100
Gene therapy can best be described as the ____
a. repair of a defect (mutation) in a gene b. insertion of normal genes to act in place of mutant genes c. insertion of human genes into other organisms d. cloning of genes to produce and purify therapeutically useful proteins e. mapping of all human genetic information
Vegetarians who rely upon a single type of plant food
A) may become severely dehydrated. B) run the risk of depleting their liver of glycogen. C) are soon unable to produce sufficient quantities of bile. D) may become protein-deficient.