________ synthesized urea in the laboratory from inorganic starting materials. Much of what is now called ________ dates from this discovery.
Fill in the blank(s) with the appropriate word(s).
Friedrich Wöhler; biochemistry
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During translation elongation, which event happens last?
A. A tRNA molecule translocates from the A site to the P site. B. A tRNA carrying an amino acid binds to the A site. C. A tRNA molecule translocates from the P site to the E site. D. A peptide bond forms.
Activation of the IFN-? globin promoter is an example of a histone code. Of the steps listed, which would be the last step?
A. exposure of the TATA box in promoter B. acetylation of nucleosomes C. transport of the nucleosome D. methylation of nucleosomes E. phosphorylation of nucleosomes
Taxol, a drug treatment for breast and ovarian cancer, was isolated from ____
a. frog skin b. vascular cambium of a tree c. roots of a tree d. insects e. primates
A superinfection results from
A. decrease in most normal flora with overgrowth of an unaffected species. B. build up of a drug to toxic levels in the patient. C. an immune system reaction to the drug. D. the wrong drug administered to the patient. E. All of these choices are correct.