6. Which chemical eliminates disulfide bonds in a purified protein? (A) NaCl, a salt (B) DTT, a reducing agent (C) H2O2, an oxidizing reagent (D) SDS, an ionic detergent and denaturing agent

8. The acetylation of lysines on the histone tails... (A)loosens chromatin structure by adding positive charges to histones. (B) recruits the heterochromatin protein HP1, resulting in the establishment of heterochromatin. (C) can be performed on methylated lysines only after they are first demethylated. (D) is a covalent modification and is thus irreversible.

6. Which chemical eliminates disulfide bonds in a purified protein?
(A) NaCl, a salt
(B) DTT, a reducing agent
(C) H2O2, an oxidizing reagent
(D) SDS, an ionic detergent and denaturing agent

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