7.Which of the following solutions is the most commonly used reagent to wash cells and retain the cell morphology? (A) 1X PBS (B) 0.5N NaOH (C) 1XTAE (D) 1% Triton X-100

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.

7.Which of the following solutions is the most commonly used reagent to wash cells and retain the cell morphology?
(A) 1X PBS
(B) 0.5N NaOH
(C) 1XTAE
(D) 1% Triton X-100

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