Which of the following is not true of the three operators of the lac operon?
A. One of the operators is contained within the lacZ gene.
B. All three operators are bound simultaneously by the Lac repressor to repress the expression of the operon.
C. The DNA between the operators bound by the Lac repressor is looped out to sterically hinder RNA polymerase.
D. Two of the three operators are upstream of the transcriptional start site.
B
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Inherited differences in hormone receptors on different species will dictate the differences in ________ and ________ behaviors
a. bonding, feeding b. group defense, mating c. bonding, molting d. mating, feeding e. mating, bonding
In size, rotifers are most comparable to which of the
following? a. flukes b. nematodes c. protistans d. jellyfishes e. sponges
Which of the following is NOT a characteristic of saturated fats?
A. they are usually solid at room temperature. B. they contain at least one double bond. C. they are found in animals. D. their fatty acids pack tightly together. E. they are a form of stored energy.
During gastrulation, _____
A) the neural tube forms B) the blastula forms C) somites form D) three germ layers form