Complementary relationships between purines and pyrimidines
A) allow adenine to form two hydrogen bonds with thymine (or uracil) and guanine to form three hydrogen bonds with cytosine to form double-stranded nucleic acids.
B) allow the interaction of the oppositely charged amino acids to form the tertiary structure of proteins.
C) allow adjacent bases in a nucleotide chain to stack tightly,stabilizing the DNA double helix.
D) provide highly ordered,repetitive bonding to form α helices and β sheets within proteins.
E) Both A and C are correct.
Correct Answer:
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