Nonpolar signaling molecules enter the cell by ____
a. facilitated diffusion
b. simple diffusion
c. osmosis
d. active transport
e. receptor-mediated endocytosis
ANSWER: b
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In passive transport, the movement of a small,
nonpolar molecule across a cell membrane depends on
a. adequate amounts of ATP. b. a concentration gradient. c. adequate ATP and a concentration gradient d. the proper transport protein. e. gated channels.
The structure found in the nose of mammals that can detect pheromones is called the __________
a. pheronasal detector b. nasopharynx c. vomeronasal organ d. olfactory mucosa e. olfactory receptor ganglia
The menstrual cycle actually consists of two cycles that are interconnected: the ovarian cycle and the uterine cycle
Indicate whether the statement is true or false
A subunit of protein is a(n)
A. amino acid. B. nucleic acid. C. fatty acid. D. phospholipid.