51. Which amino acids carry a negative charge at pH 7.0? (A) Arg, Lys (B) Phe, Try, Trp (C) Glu, Asp (D) None of the above

4. Which description is NOT correct? (A) A nucleic acid consists of four kinds of bases linked to a sugar–phosphate backbone. (B) A pair of nucleic acid strands with complementary sequences can form a double-helical structure. (C) DNA is a structurally rigid molecule that only exist in a specific helical form. (D) Double-stranded DNA can wrap around itself to form a supercoiled structure.

51. Which amino acids carry a negative charge at pH 7.0?
(A) Arg, Lys
(B) Phe, Try, Trp
(C) Glu, Asp
(D) None of the above

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