Probes for cloned genes use ____.
A. complementary nucleotide sequences tagged with a detectable label
B. specific antibodies that kill all the cells
C. specific enzymes that lyse all the cells
D. certain bacteria that glow when they take up the genes
E. DNA ligase
Answer: A
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Dependence on animal vectors for fertilization
and dispersal is characteristic of many species of a. ferns. b. angiosperms. c. mosses. d. conifers. e. cycads.
The carrying capacity is the population size at which dN/dt
A) is positive. B) is negative. C) is equal to 0. D) is equal to N.
Suppose an efficient conducting system evolved in a moss that could transport water and other materials as high as a tall tree. Which of the following statements about "trees" of such a species would be FALSE?
A) Fertilization would probably be more difficult. B) Spore dispersal distances would probably increase. C) Females could produce only one archegonium. D) Individuals would probably compete more effectively for access to light.
amino acides that cannot be produced by the body are called __________ amino acids
Fill in the blank(s) with the appropriate word(s).