The bases which are present in human DNA?: (A) Adenine-guanine-thiamine- uracil, (B) Adenine-guanine- cytosine-uracil, (C) Adenine- guanine-cytosine-thymine, (D) None of the above
Answer is C. Double-stranded (ds) Has adenine- guanine-cytosine-thymine Has Deoxyribose DNA does not contain Uracil 2 strands are held together by hydrogen bonds. There are covalent bonds (3' 5' phosphodiester bonds) in sugar-phosphate backbone.