Refer to the accompanying figure. A semilunar valve regulates blood flow into which structures?
a. 1 and 2
b. 1 and 5
c. 1 and 7
d. 2 and 7
e. 7 and 11
c
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Your patient becomes sick due to an infection by the influenza virus and now has the flu. The cells which would most directly lyse virally infected host cells in this case are __________. These cells mature in the __________.
A. T cells; bone marrow B. B cells; thymus C. T cells; lymph nodes D. B cells; spleen E. T cells; thymus
Ghrelin is
a. a drug used to control weight gain. b. a signaling molecule released by the adipose cells to stimulate appetite. c. a signaling molecule released by cells in the stomach and brain to stimulate appetite. d. a hormone found only in mice that is used to study weight loss. e. none of these
Four of the following are characteristics of an adenovirus. Which one is the exception?
a. is a naked virus b. is the most common cause of the common cold c. has a spiked protein coat d. infects animals e. has a lipid envelope
A derived character that is shared by all members of a clade is called a ________ of that clade.
Fill in the blank(s) with the appropriate word(s).