10. One of the two major distinguishing characteristics of mollusks is
(a) the presence of three body regions.
(b) the mantle.
(c) segmentation of the body.
(d) jointed appendages.
(b) the mantle.
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Which of the following bridges the gap
between a neuron sending a message and the neuron receiving it? a. threshold value b. action potential c. transmitter molecules d. a neurohormone e. all of these
Comparing cells synthesizing secretory proteins and cells secreting steroid hormones, the cells synthesizing the steroid hormones have
A) more rough ER. B) more smooth ER. C) equal amounts of smooth and rough ER. D) equal amounts of smooth and rough ER, but more lysosomes. E) equal amounts of smooth and rough ER, but fewer lysosomes.
A homeobox gene is one that produces a group of repetitive base sequences such as a VNTR
Indicate whether the statement is true or false
Enterococcus faecalis has been associated with ________.
A. endocarditis B. sinus infection C. abscesses D. diarrhea