1.What type of bonds stabilizes the quaternary structure of proteins? * A. Peptide bond B. Electrostatic interactions C. Hydrogen bonds D. Disulfide bridges E. Hydrophobic bonds 2.  A new drug is developed which selectively cleaves covalent bonds between two sulfur atoms of non-adjacent amino acids in a polypeptide chain. Which level of protein structure in affected molecules would be most directly affected by the drug? * A. Primary B. Secondary C. Tertiary D. Quaternary

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