A penis becomes erect because of ____
a. muscle contractions
b. blood flow into spongy tissue
c. hydrostatic pressure
d. osmosis
e. abdominal wall contractions
ANSWER: b
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You have discovered a new microorganism, but you want to know if it is a eukaryote or a prokaryote. To investigate this question you prepare a slide with a simple stain and view it with a light microscope with a 40X objective lens and 10X ocular lens
You also prepare a control slide using Saccharomyces cerevisiae (a unicellular eukaryote). You can see the cells on your control slide, but you don't see cells when you look at your unknown microorganism. What can you conclude from this experiment? A) The experiment failed to visualize the organism because the stain killed it. B) Your new unknown microorganism is probably a virus. C) The cells of the new unknown microorganism may be too small to see with the objective and ocular lenses you used. D) The new unknown microorganism is probably an archaeon.
The ________ is the link between glycolysis in muscle cells and gluconeogenesis.
Fill in the blank(s) with the appropriate word(s).
Sexual behavior and emotional expression are partially controlled by the
a. pineal gland. b. medulla. c. hypothalamus. d. thalamus. e. cerebrum.
What external layers must a sperm penetrate in order to fertilize the egg?
What will be an ideal response?