Which of the following represents a potential threat to biodiversity?
(a). People construct artificial reefs to support marine life.
(b). Humans clear land for agriculture and housing.
(c). Energy flows through an ecosystem, with much lost as heat.
(d). Tropical rain forests and coral reefs are found where solar energy is the most abundant.
(e). In a food chain, one population feeds on another.
Answer: (b). Humans clear land for agriculture and housing.
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Because DNA strands are antiparallel, DNA replication at a single replication fork proceeds
A) continuously on both strands. B) continuously on one strand and discontinuously on the other. C) discontinuously on both strands. D) continuously on both strands for a time and then discontinuously.
Which of the following items is NOT a part of the name of a restriction enzyme?
A) the Gram reaction of the source bacterium B) the specific epithet of the source bacterium C) Roman numerals to indicate its order of discovery D) the strain of the source bacterium E) the genus of the source bacterium
The species of Moraxella that is most commonly associated with human infections, primarily of the respiratory tract, is:
a. M. catarrhalis. b. Moraxella lacunata. c. Moraxella canis. d. Moraxella atlantae.
What is the difference between the rocky intertidal community and the rocky intertidal ecosystem?
What will be an ideal response?