nucleotide

Chargaff's Rules

transforming principle

isotope

x-ray diffraction

ribose

deoxyribose

nitrogenous base

purine

pyrimidine

Adenine

Guanine

Cytosine

Thymine

Uracil

nucleoside

phosphate group

deoxyribonucleotide

ribonucleotide

Phosphodiester linkage

polynucleotide strand