The primary consumers in natural communities
are
a. herbivores.
b. carnivores.
c. scavengers.
d. decomposers.
e. all of these
A
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Which of the following describes the function of the lacO region of the lac operon?
A. It encodes for the Lac repressor protein. B. It contains the promoter for the operon. C. Mutation of this region leads to constitutive expression of the operon. D. It encodes for the galactoside permease protein.
Indifferent gonads develop
A) during the first two weeks of prenatal development. B) during the fifth week of prenatal development. C) during the ninth week of prenatal development. D) when the embryo becomes a fetus.
A neuron's __________ receive signals, and its __________ transmits signals. Fill in the blank(s) with the appropriate word(s)
Neural crest cells:
a. originated in the first chordates. c. migrate during development. b. develop only into neurons. d. produce only beaks in birds.