27. Which of the following types of molecules are the major structural components of the cell membrane? (A) phospholipids and cellulose (B) nucleic acids and proteins (C) phospholipids and proteins (D) proteins and cellulose

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.

27. Which of the following types of molecules are the major structural components of the cell membrane?
(A) phospholipids and cellulose
(B) nucleic acids and proteins
(C) phospholipids and proteins
(D) proteins and cellulose

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