Even though there is free rotation around the glycosidic bond of nitrogenous bases, steric hindrance:
A. causes the purines to adopt only the anticonfiguration.
B. causes the pyrimidines to adopt only the syn configuration.
C. causes pyrimidines to adopt only the anti configuration.
D. causes purines to adopt only the syn configuration.
E. only affects purine bases; pyrimidines are allowed to adopt any configuration.
C
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