A newly developed vaccine can prevent cancer caused by _____
a. AIDS
b. polio
c. measles
d. HIV
e. HPV
ANSWER: e
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Xanthophyll pigments __________
A. prevent formation of reactive oxygen species B. absorb light energy C. convert light energy into heat D. reflect yellow light E. All answer options are correct.
Humans have ___ symmetry and are ___
a. radial--protostomes b. radial-deuterostomes c. bilateral--deuterostomes d. bilateral-protostomes e. biradial-deuterostomes
In a classic experiment, Otto Loewi electrically stimulated the vagus nerve of a frog heart. He then took the fluid bathing the stimulated heart and applied it to a second frog heart. The beating rate of both hearts slowed down with this treatment. Based on this response, you can assume the nerve he stimulated was part of the
A. parasympathetic system. B. sympathetic system. C. somatic system. D. central nervous system. E. atrioventricular system.
What is responsible for the selective permeability of a cell membrane?
a. the position of cholesterol in the membrane bilayer b. the integral proteins of the membrane c. the hydrophobic core formed by the phospholipid tails d. the hydrophilic end facing the cell exterior