Which is the correct sequence of the transfer of information in most organisms?
a. Protein to DNA to RNA
b. RNA to DNA to protein
c. DNA to RNA to protein
d. RNA to protein to DNA
Ans: c. DNA to RNA to protein
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The rate of oral cancer has risen steadily since 1973, and many health experts believe that this increase is related to the transmission of:
a..HIV. b..HPV. c..HSV-2. d..HSV-1.
The enhanced selectivity of tandem affinity purification (TAP) is due to:
A. two different tags?calmodulin-binding protein and protein A?that are fused to the protein of interest and allow consecutive rounds of affinity chromatography. B. the presence of a TEV cleavage site in the fusion protein. Cleavage of this site further purifies the protein by cleaving of the protein A tag. C. the fusion of a Gal4p DNA binding domain to the protein along with protein A. These two tags allow for purification of the fusion protein. D. the calmodulin-binding protein tag, which binds strongly to calmodulin. E. All of these choices contribute to the enhanced selectivity.
Many species of birds form large flocks. What dispersion pattern describes this behavior?
A. random B. uniform C. rapid D. social E. clumped
Fresh water has an osmolarity of
a. ~5 mOsm/L. b. ~225 mOsm/L. c. ~300 mOsm/L. d. ~1000 mOsm/L. e. ~1500 mOsm/L.