It is difficult to make an HIV vaccine because the ____
a. virus mutates rapidly
b. cost is prohibitive
c. virus uses DNA
d. virus is a retrovirus
e. components of the virus is found in high concentrations in the blood
ANSWER: a
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The presence of a hard chancre in primary syphilis is representative of the body's
A. intense inflammatory response. B. antibody response. C. rejection of the invaded tissue. D. septicemia due to infiltration of the organism.
The ciliary muscle changes the shape of the lens
____________________ Indicate whether the statement is true or false.
In a species where females typically mate with multiple males
A. there is no competition between males B. males likely compete indirectly with each other through sperm competition for successful fertilization of a female's eggs C. males likely compete directly with each other for the opportunity to male with a female D. males may have elaborate penis morphologies or large ejaculate volumes E. females may have the ability to preferentially use sperm from a specific male
A person responds to touching a hot pan by pulling his hand away before he feels pain. Why does it take longer for him to feel pain?
What will be an ideal response?