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Chapter 1: Q.24 (page 7)
Explain the difference between an epitope and an antigen.
An epitope is the section of the antigen to which the antibodies bind.
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Why are steroids able to diffuse across the plasma
membrane?
a. Their transport protein moves them through the
membrane.
b. They are amphipathic, allowing them to interact
with the entire phospholipid.
c. Cells express channels that let hormones flow down
their concentration gradient into the cells.
d. They are non-polar molecules.
Active transport of K+ in Malpighian tubules ensures that:
a. water follows K+ to make urine
b. osmotic balance is maintained between waste
matter and bodily fluids
c. both a and b
d. neither a nor b
The production of megaphylls by many different species of plants is an example of _____.
a. parallel evolution
b. analogy
c. divergent evolution
d. homology
Which of the following is a barrier against pathogens provided by the skin?
Which immune cells bind MHC molecules on APCs via CD8 coreceptors on their cell surfaces?
a. TH cells
b. CTLs
c. mast cells
d. basophils
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