What structures inside the human penis are responsible for an erection?
A) columns of erectile tissue that fill with blood
B) a series of small bones that push out of the pelvic cavity and into the penis during arousal
C) small balloon-like glands that fill with air
D) one large bone that pushes out of the pelvic cavity and into the penis during arousal
A
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Reactivation of chickenpox is called
A. shingles. B. herpes zoster. C. pneumonia. D. exanthems. E. shingles AND herpes zoster.
What is the correct order in bacterial antigen
processing and presentation? 1. lysosomal enzymes digest the bacterium into molecular bits 2. the antigen-MHC complex is displayed on the cell surface 3. the endocytic vesicle fuses with a lysosome 4. a bacterium is engulfed by a phagocytic cell
a. 4-3-1-2 b. 4-3-2-1 c. 3-4-2-1 d. 3-4-2-1 e. 2-4-3-1
Transgenic organisms are used to aid studies of:
a. genetic diseases. d. viral diseases. b. gene expression. e. genes involved in cancer development. c. immune system function
The processes of chemical cycling would be studied mainly by ________
A) an environmentalist B) a community ecologist C) a population ecologist D) an ecosystem ecologist