Epinephrine triggers vasodilation by binding to which receptors and vasoconstriction by binding to which receptors?
A) beta : cholinergic
B) alpha1 : beta1
C) beta2 : alpha
D) alpha2 : beta2
E) alpha : beta2
Answer: C) beta2 : alpha
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Gene families are created when
A. genes duplicate. B. exons converge. C. viral infections occur. D. introns are not removed from the mRNA after transcription. E. both exon convergence and intron splicing.
The accompanying figure shows a pedigree and the results of a Southern blot analysis of the ?-globin gene for four family members (II-1, II-2, II-4, and II-5). III-2 was just born and neither her health nor her DNA has been analyzed
The figure also shows a restriction map of ?A and ?S alleles and the location of three DNA probes (A, B, and C). If III-2 is analyzed by Southern blot using the same probe(s) as that used on other members of the family, what is the probability that the result will be only one band? A) 0 B) 1/9 C) 1/6 D) 1/4 E) 2/3
You wish to use mRNA profiles to examine gene expression in cells during times of stress. You are investigating the cell's
A) spliceosome. B) genome. C) proteome. D) transcriptome. E) BLAST (Basic Local Alignment Search Tool).
You are employed by the Natural History Museum of Chicago as a wildlife biologist. You recently completed an expedition to Indonesia where you discovered a new and very colorful species of beetle. Based on observations, you hypothesize that sexual selection may be playing a role in the evolution of this species. Which of the following observations would support your hypothesis?
A. Males defend territories. B. Female preference for larger, brighter males. C. Male beetles are bigger and more brightly colored than females. D. All of the above observations would support your hypothesis.