When they secrete eggs and sperm, the gonads are considered what type of glands?
a) exocrine
b) sudoriferous
c) holocrine
d) endocrine
Answer: a) exocrine
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The mechanism by which bumblebees and certain moths generate preflight heat in thoracic muscles involves
A) A metabolic futile cycle in carbohydrate metabolism B) The simultaneous contraction of antagonistic flight muscles. C) Rapid wing movement that avoids lift. D) All of the above
Hormones produced by the thyroid include
a. calcitonin. b. thyroxine. c. triiodothyronine. d. both (a) and (b) above. e. all of these answers.
Which organism is most closely related to animals regarding evolution?
A. A fungus B. A flowering plant C. A bacterium D. A protist
Cilia and flagella are distinguished from each other on the basis of
A. width and numbers. B. length and numbers. C. depth and numbers. D. length and width. E. None of these choices is correct.