Cholesterol, a membrane lipid in animals, has a chemical structure similar to
a. estradiol.
b. phosphatidylinositol.
c. thymine.
d. triacylglycerol.
Ans: a. estradiol.
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What plant group includes almost all modern crop plants?
A) gymnosperms B) annual plants C) dicots D) legumes
In the accompanying figure, the structure labeled as 3 is:
a. the secondary xylem. b. formed by the division of the vascular cambium. c. found adjacent to the pith. d. usually referred to as wood. e. the cork cambium.
Certain orchids produce flowers and secrete scents that resemble female bees so that male bees will mount these
flowers and attempt to copulate with them. This bizarre occurrence is an example of: a. fertilization. b. coevolution. c. apomixis. d. self-pollination. e. asexual reproduction.
Transfer RNA
A) is a subunit of ribosomes. B) brings amino acids to the ribosome. C) is a nucleic acid that carries the code for the primary structure of a protein. D) transfers proteins into the nucleus.