Phenotypic plasticity
What will be an ideal response?
capacity to change phenotype in response to physical environment
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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.
The countries of ___ and ___ have the world’s
highest human populations.
a. India...China b. China...United States c. China...Brazil d. India...United States e. United States...Canada
The mismatch repair system recognizes mismatched base pairs, removes a portion of the DNA strand containing the error, and then resynthesizes the missing DNA using the correct sequence as a template. But what if the mismatch repair system instead removed a piece of the DNA strand that contained the correct sequence? What would replication of this improperly repaired sequence produce?
A. two DNA molecules bearing the same mutation B. two DNA molecules with different mutations C. two DNA molecules that are missing one nucleotide pair D. two DNA molecules with a gap where the correct sequence was excised E. one DNA molecule with a mutation and one DNA molecule with a mismatch
Under the influence of hormones, branch roots emerge from the ________ of a growing root
A) epidermis B) Casparian strip C) endodermis D) pericycle E) central cylinder