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biochemistry

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I just wanted to clarify anwsers.
Question
23. Nucleotides contain phosphate groups bonded to the..
A) C3' or c5' atoms
B). C3 or C3' atoms
C). N1 or N9 Atoms
D). C3 or N9 atoms
E). C3 or C5 atoms
The anwser that I chosen in A.
QUESTION 19. When the hydrogen ion concentration of a solution increases,
A). The hydroxide ion concentration increases and the pH increases
B). The hydroxide ion concentration decreases and the pH increases.
C). The hydroxide ion concentration decreases and the pH decreases
D). The hydroxide ion concentration increases and the pH decreases.
I picked B?

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