Steroid hormones do not require membrane receptors because they
a. are small enough to pass directly through the membrane.
b. are lipid-soluble like the bilayer.
c. pass through special channels.
d. are water-soluble.
e. dissolve in the cholesterol of the membranes.
B
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What is the main difference between a fat (triglyceride) and a phospholipid?
A. A fat has 4 fatty acids attached to glycerol, whereas a phospholipid has 3. B. A fat has 3 fatty acids attached to glycerol, whereas a phospholipid has 4. C. A phospholipid has 2 fatty acids attached to glycerol, whereas a fat has 3. D. A phospholipid has 3 fatty acids attached to glycerol, whereas a fat has 2. E. None of the above are true.
A factory with an office that controls the information sent to separate rooms for each of the manufacturing and shipping processes would be analogous to
a. a virus. c. a prokaryotic cell without a nucleus. b. a prokaryotic cell with a nucleus. d. a eukaryotic cell with a nucleus.
Trees with needle-shaped leaves and a thick cuticle with stomata sunk below the leaf surface dominate ____________________.
Fill in the blank(s) with the appropriate word(s).
What is the role of memory cells?
A) remain in the lymphoid tissue to rapidly proliferate and differentiate upon subsequent exposure to the same pathogen B) suppress the cellular response once the infection has passed C) circulate in the body at elevated levels to maintain an active attack against any possible pathogen D) prevent an immune response against members of the normal microbiota E) provide immune protection specifically for central nervous system