3. The HIV virus infects primarily___________. (A) liver cells (B) skin cells (C) brain cells (D) red blood cells (E) cells in the immune system

6. Planarity of the peptide bond means that rotation is allowed about the bond linking ___________the and the carbon of the peptide bond, and also about the bond linking the___________ to the adjacent α-carbon. (A) a-carbon, carbony1 carbon (B) B-carbon, carbonyl carbon (C) carbonyl carbon, nitrogen of the peptide bond (D) a-carbon, nitrogen of the peptide bond (E) none are true

3. The HIV virus infects primarily___________.
(A) liver cells
(B) skin cells
(C) brain cells
(D) red blood cells
(E) cells in the immune system

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