44. Which of the following aqueous solutions has the lowest pH? The solutions have H+ concentration respectively of (A) mol/L (B) mol/L (C) mol/L (D) mol/L

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.

44. Which of the following aqueous solutions has the lowest pH? The solutions have H+ concentration respectively of
(A) mol/L
(B) mol/L
(C) mol/L
(D) mol/L

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