Multigene families arise from _____
a. a single gene duplication event
b. repeated cycles of gene duplication followed by mutation
c. single point mutations
d. exon shuffling
e. deletions of genes
ANSWER: b
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Which of the following is NOT a function of oxytocin?
A. pair bonding B. milk-ejection reflex C. milk production D. uterine contractions
The movement of materials already in the
phloem is described as
a. translocation. b. declining pressure flow. c. cohesion-tension. d. active transport. e. transpiration
The area over which an animal moves in the course of daily activity, but which it does not necessarily defend against other animals, is called what?
A. family home B. foraging space C. home range D. nesting site E. territory
A pyramid of numbers gives a reasonably accurate representation of the relationship between trophic levels when
A. all the organisms are consumers. B. all the organisms are about the same size. C. all the organisms are the same age. D. all the animals are carnivores.