Photoautotrophs use ________ as an energy source and ________ as a carbon source
a. organic molecules / CO2
b. inorganic molecules / organic molecules
c. light / CO2
d. light / organic molecules
Answer: C
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Cells that can detect and respond to a hormone are known as
a. target cells. b. regulator cells. c. receptor cells. d. messenger cells. e. endocrine cells.
Only animals with sweat glands can take advantage of evaporative cooling
Indicate whether the statement is true or false
Bacteria are difficult to control because of their
A. high reproductive rate. B. low metabolic rate. C. lack of a nucleus. D. lack of a cell wall.