Both plant and animal cells have all the following structures EXCEPT
a. a cell membrane.
b. a nucleus.
c. mitochondria.
d. chloroplasts.
D
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Cichlid fish from Lake Apoyeque, Nicaragua, have begun to develop distinct morphologies that allow them to eat different foods within the same lake. If these fish never fully speciate but continue to produce fit hybrids over a long period of time, what will be the result?
a. reinforcement
b. fusion
c. stability
d. inviability
Glucagon is produced by the
a. adrenal cortex. b. adrenal medulla. c. thyroid. d. kidneys. e. pancreas
Toads in a particular population vary in size. A scientist observes that in this population, large males mate with females significantly more often than small males do. All the following are plausible hypotheses to explain this observation EXCEPT:
A. Females select large males more often than they select small males as mates B. Small females are more likely to mate with small males and large females are more likely to mate with large males C. Large males are successful in competing for mates more often than small males are D. Large males occupy more breeding territory than small males do E. The calls produced by large males are more attractive to females than the calls made by small males
Diffusion is an example of ________
A) phagocytosis B) active transport C) endocytosis D) passive transport