The total numbers and kinds of genes in a given population is the ____
a. population genotype
b. species pool
c. gene pool
d. genetic drift
e. group divergence
ANSWER: c
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Chemical selection occurs....
A. when a catalyst speeds up a process that would normally occur at a slower rate. B. when covalent bonds are formed between two previously unlinked molecules, increasing their stability. C. when a chemical within a mixture increases compared to other chemicals in the mixture due to a unique property. D. during the ribozymic phase of coacervate formation. E. after the formation of a membrane and when the DNA is replicated and transcribed.
In eukaryotes, where does transcription take place?
A) In the cytoplasm B) Anywhere in the cell C) In the nucleus D) In both the cytoplasm and nucleus E) In the mitochondria
Which situation(s) might warrant the removal of a histidine tag when purifying a recombinant protein?
A. The expression vector used for inserting the gene of interest already contains histidine-encoding sequences. B. Histidine residues inhibit protein folding, thereby decreasing the functionality of the protein. C. Histidine residues bind preferentially to nickel resins on the column during purification, and are not washed away. D. All of the choices are correct.
Which statement best sums up our understanding of how animals navigate during migration?
A. We have a thorough understanding of orientation but not navigation. B. Animal navigation is a complete mystery. C. The mechanisms have been worked out in great detail, from the genes involved, to the brain structures, to the resulting behavior. D. We have some understanding of the information different animals rely on (sun, stars, or magnetic fields), and some sensory structures, but beyond that the mechanisms are still mysterious.