Which of the following senses involves molecules binding to a receptor surface? 

A. sight
B. hearing
C. touch
D. smell


D. smell

Biology & Microbiology

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Alcohol acts predominantly as a(n)

a. stimulant. b. analgesic. c. hallucinogen. d. depressant. e. anesthetic.

Biology & Microbiology

The overall reactions of photosynthesis are best summarized as:

a. 12 CO2 + 6 H2O ? C6H12O6 + 12 O2 + 6 H2O. b. C6H12O6 + 6 O2 + 6 H2O ? 6 CO2 + 12 H2O. c. 6 CO2 + 12 H2O ? C6H12O6 + 6 O2 + 6 H2O. d. 6 CO2 + 12 H2O ? C6H12O6 + 12 O2. e. 6 H2CO3 + 6 H2O ? C6H12O6 + C6H12O6 + 6 H2O + 6 O2.

Biology & Microbiology

The distance between the crests of two successive waves of light is known as the ____.?

a. wave frequency
b. wave period
c. wave distance
d. wavelength
e. wave space

Biology & Microbiology

Endothelial cells that line the inside of blood vessels:

A) are nonliving cells made of protein. B) are made of epithelial squamous cells. C) regulate blood flow and coagulation. D) are composed of specialized nervous tissue

Biology & Microbiology