When a predator drives down a prey population to a low abundance, it will often
A) switch prey species.
B) consume prey to extinction.
C) go extinct.
D) decrease handling time of prey.
A
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Which of the following DNA sequences is not commonly carried on a DNA-only transposon?
(a) transposase gene (b) reverse transcriptase gene (c) recognition site for transposase (d) antibiotic-resistance gene
14C is an isotope of carbon that possesses:
A. 6 protons, 6 neutrons, and 2 electrons. B. 6 protons, 8 neutrons, and 6 electrons. C. 8 protons, 6 neutrons, and 2 electrons. D. 6 protons, 2 neutrons, and 6 electrons. E. 6 protons, 8 neutrons, and 2 electrons.
When solutes are unloaded from phloem, water ____
a. is pumped into the phloem by active transport b. leaves the xylem by osmosis c. moves into the phloem by facilitated diffusion d. is pumped out of the phloem by active transport e. leaves the phloem by osmosis
Which of the following defines genetic diversity?
a. the variety of alleles in a species or ecosystem b. the number of living species currently identified c. the variety of metabolic compounds in an ecosystem d. the number of prokaryotic species in a genus