The sporophyte is the dominant and conspicuous generation in
a. the fern allies and ferns.
b. gymnosperms.
c. flowering plants.
d. all of the above.
d
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The DNA molecule could be compared to a
a. hairpin. b. ladder. c. key. d. globular mass. e. flat plate.
One of the strongest lines of evidence of a meteor or comet impact in the late Cretaceous is
A) the extinction of the dinosaurs in only South America. B) a thin layer of potassium-40 in late Cretaceous fossil strata. C) a thin layer of iridium-enriched clay in late Cretaceous fossil strata. D) the warming of Earth's climate in the late Cretaceous.
The human genome is composed of approximately how many base pairs?
A) 3 billion B) 10 billion C) 30 billion D) 100 billion E) 1 trillion
Which of the following statements about restriction nucleases is false?
(a) A reproducible set of DNA fragments will be produced every time a restriction nuclease digests a known piece of DNA. (b) Restriction nucleases recognize specific sequences on single-stranded DNA. (c) Some bacteria use restriction nucleases as protection from foreign DNA. (d) Some restriction nucleases cut in a staggered fashion, leaving short, single-stranded regions of DNA at the ends of the cut molecule.