The ____ is a hormone produced by specialized cells in the heart in response to high blood pressure
a. atrial natriuretic factor
b. renin
c. aldosterone
d. antidiuretic hormone
e. angiotensin
ANSWER: a
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An example of an animal with a long digestive tract and molars with a large, ridged surface is
a. cat. b. deer. c. dog. d. shark. e. tiger.
A polysome is
a. one of the units of a ribosome. b. the nuclear organelle that synthesizes RNA. c. an organelle that functions similarly to a ribosome during meiosis. d. the two units of a ribosome considered together. e. an mRNA molecule with several ribosomes attached.
Which of the following trophic levels would contain the lowest quantity of energy (kcal per m2)?
a. secondary consumers b. tertiary consumers c. herbivores d. producers e. primary consumers
Fossils include rocks and sediments that
A) have been shaped by people to resemble plants or animals. B) bear the impressions or shapes of preserved organisms. C) have been shaped by wind and water to resemble lifelike forms. D) all of the above.