The relative impermeability of membranes to
water soluble molecules is a result of
a. the nonpolar nature of water.
b. the presence of large proteins that extend
through both sides of membranes.
c. the presence of inorganic salt crystals
scattered through some membranes.
d. the presence of cellulose and waxes.
e. the presence of phospholipids in the lipid
bilayer.
E
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The genotype of an organism constitutes its observable characteristics
A. true B. false
Fruit that forms on an unpollinated plant in response to a hormone will lack
A) flavor. B) seeds. C) rind. D) naturally occurring hormones.
During reactions catalyzed by oxidoreductases an electron donor is
A. oxidized. B. reduced. C. synthesized. D. degraded. E. unaltered.
What can be said about peptide hormones?
A. They bind membrane receptors to elicit a response on target cells. B. They are water-soluble and bind membrane receptors to elicit a response on target cells. C. They are lipid-soluble. D. They are generally water-soluble. E. They bind intracellular receptors to elicit a response on target cells.