21. Which of the following protein modifications is critically involved in the intracellular signaling pathway? (A) Glycosylation (B) Phosphorylation (C) Hydroxylation (D) Acetylation

5. Which of the following statements is INCORRECT for retroviruses? (A) They are enveloped RNA virus. (B) They encode reverse transcriptase and replicate through a DNA intermediate. (C) Some of them produce tumors in the infected animals. (D) Retroviruses include human immunodeficiency virus (HIV) which primarily infects CD8 T cells.

21. Which of the following protein modifications is critically involved in the intracellular signaling pathway?
(A) Glycosylation
(B) Phosphorylation
(C) Hydroxylation
(D) Acetylation

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