Which one of the following proteins is not required at low, basal levels for the regulation of the expression of the lac operon?
A. thiogalactoside transacetylase
B. galactoside permease
C. ?-galactosidase
A
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Which of the following will not result from site-specific recombination?
A. inversion B. deletion C. insertion D. translocation E. All of the choices given can occur.
Echinoderms include _______.
a) insects and crustaceans b) tapeworms and planarians c) jellyfish and sea anemones d) snails, clams, and squids e) starfish and sea urchins
If a larva of Echinococcus granulosus is found in humans, humans are the
A) definitive host. B) infected host. C) intermediate host. D) reservoir. E) None of the answers is correct.
Which of the following occurs during metaphase?
A. Chromosomes are about 30 nm wide. B. Heterochromatin is converted to euchromatin. C. The "beads on a string" structure is visible. D. Chromosomes undergo gene transcription. E. Chromosomes are much shorter than they were in interphase.