As a microbiologist, you have been asked to investigate the regulation of a novel gene in a bacterial species. Given what is known about bacteria, the logical place to begin your investigation is
A. translational regulation.
B. regulation by enhancer elements.
C. transcriptional regulation.
D. regulation by general transcription factors.
E. alternative splicing regulation.
Answer: C
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What will be an ideal response?
On the Hawaiian Islands, speciation in Drosophila occurred when a small group of males and females colonized a new
island, where they faced environmental selection pressures. In addition, sexual dimorphism – and therefore, sexual selection – maintained reproductive isolation from other populations on the new island. These populations, although closely related, remained ecologically different. These events are examples of ____.
a. a founder effect only b. genetic drift only c. adaptive radiation only d. a founder effect and genetic drift, but not adaptive radiation e. a founder effect, genetic drift, and adaptive radiation
Imagine that you have data that shows that humans from a light-skinned population can exhibit greater similarity in DNA sequence with individuals from a dark-skinned population than with other individuals in the light-skinned population. Based on these hypothetical data, should these light- and dark-skinned human populations be considered separate species under the phylogenetic species concept? Why or why not?
A. Yes. Regardless of the DNA sequence data, they have different skin colors. B. No. The DNA sequence data do not support the conclusion that they represent different clades. C. Yes. The DNA sequence data conclusively show that they represent different clades. D. Maybe. It depends on whether the two populations can interbreed and produce viable offspring
Drug-resistant populations of microbes arise when
A) exposure to drugs selectively kills sensitive cells, allowing overgrowth of resistant cells. B) exposure to drugs causes mutations that produce resistance. C) resistant cells become numerous in a population due to their greater vigor. D) the patient becomes immune to the drug. E) synergy between medications occurs.