Plant hormones are small organic molecules produced by the plants themselves.
a. true
b. false
Ans: a. true
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Which of the following statements about kudzu is
false? a. It was imported from Japan for erosion control and forage. b. Its shoots can grow ten meters per year. c. It has spread north to Connecticut, south to Florida, and westward across the Mississippi River. d. It withstands burning and grows back from roots.It is now found in Oregon, due to jump dispersal.
On day 21 of the menstrual cycle, most progesterone is secreted by the _______ in the ovary.
Fill in the blank(s) with the appropriate word(s).
The influenza viruses that infect man usually are derived from a type that could also infect:
a. Horses and sheep b. Cattle and water buffalo c. Chimpanzees and gorillas d. Birds and pigs e. A variety of primates
The pyrimidine bases in DNA are
a. adenine and guanine. b. adenine and cytosine. c. cytosine and thymidine. d. cytosine and guanine.