Operons can best be defined as
A) operational mutations affecting gene expression.
B) a set of genes under common regulatory control.
C) dominant alleles responsible for enzyme synthesis.
D) a balance between repressor and inducer molecules.
E) a common mode of gene expression in bacteria.
B
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Transplantation of tissue from the same individual
If all conditions of Hardy–Weinberg equilibrium are met,
(a) allele frequencies move closer to each generation. (b) allele frequencies change in the direction predicted by natural selection. (c) allele frequencies stay the same. (d) all allele frequencies increase.
Which of the following lifestyle changes would NOT boost the immune system?
A. reducing stress by practicing yoga B. walking 20 minutes a day C. eating amino acids D. reducing inflammation by using a cortisol supplement E. All of these actions will boost the immune system
The profundal zone is characterized by
a. plankton. b. algae. c. a variety of plants and animals. d. decomposers. e. all of these.