Studies of chromosomal and mitochondrial DNA suggest all of the following EXCEPT that every
locus exhibits some variability in its nucleotide sequence
a. among individuals from a single
population.
d. within species in a genus.
b. between populations of the same species. e. within an individual.
c. between related species.
E
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In an experiment examining adrenergic receptors, epinephrine alone was not able to trigger an increase
in cAMP, but when beta receptors were fused with animal cells, there were high levels of cAMP. What was occurring?
a. activation of epinephrine. b. protein kinase inhibition. c. activation of adenylyl cyclase. d. protein kinase amplification. e. both activation of adenylyl cyclase and protein kinase amplification.
What structures allow water to move laterally and vertically through xylem cells?
a. sieve elements b. companion cells c. sclereids in the cell walls d. pits in the cell walls e. perforated sieve plates
The release of most nitrogen oxides comes from ____
a. ammonia-oxidizing bacteria b. the use of DDT c. coal-burning power plants d. drilling for gasoline and oil e. combustion of gasoline and oil
Dr. Haxton told one of his students, "To move in the bloodstream, fats need the help of phospholipids." What would a good student say?
What will be an ideal response?