An E. coli strain has been found to constitutively express the lac operon despite the presence of the Lac repressor and absence of allolactose. It would be appropriate to surmise that a mutation in the Lac repressor has:
A. increased the Kd of the repressor.
B. decreased the Kd of the repressor.
C. increased binding of the repressor to DNA.
D. increased binding of allolactose to the repressor.
E. increased the rate of growth of E. coli.
A
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The gene locus governing flower color in snapdragons exhibits ____ because heterozygous individuals appear pink
while homozygous individuals are either white or red.
a. codominance b. equilibrium c. autosomal dominance d. complete dominance e. incomplete dominance
Four of the five answers listed below are limits
to achieving a population's full biotic potential. Select the EXCEPTION.
a. lack of nutrients b. predation c. exponential growth d. competition for space e. waste build up
Mesoderm gives rise to all of the following
except
a. the muscular system. b. the circulatory system. c. the reproductive system. d. the nervous system. e. the excretory system.
Which of the following are homologous?
A) the forelimb of a dog and the hindlimb of a cat B) the forelimb of a dog and the forelimb of a cat C) wings of a butterfly and wings of a sparrow D) the mouth of a mosquito and the beak of a hummingbird