In standardized DNA fingerprinting used in the United States, ____
a. 13 different noncoding loci are examined
b. 13 different coding loci are examined
c. only loci that do not vary among individuals are examined
d. only long tandem repeats loci are examined
e. the sequence of short tandem repeats is determined
ANSWER: a
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Cycads and ginkgos differ from all other seed plants by:
A. having flagellated sperm within the pollen B. lacking cambium C. having the sexes separated on different trees D. being pollinated by wind instead of insects E. All of the ways mentioned in the other choices are correct.
Which groups of commercially grown plants are produced by tissue culture propagation?
a. Pine trees b. Orchid c. Grape vines d. Grasses e. Rose bushes
As opposed to external fertilization, internal fertilization ensures that
a. sperm and egg will be released simultaneously. b. only the fittest of sperm and egg combinations will survive. c. sperm will be protected until they can unite with the eggs. d. all of the sperm will fertilize eggs. e. the number of sperm and eggs produced will be equal.
A fellow student brought in a leaf to be examined. The leaf was dark green, thin, had stoma on the lower surface only, and had a total surface area of ten square meters. Where is the most likely environment where this leaf was growing?
A) a large, still pond B) a tropical rain forest C) an oasis within a grassland D) the floor of a deciduous forest