2006-11-25 06:04:26 · 4 answers · asked by kristin e 1 in Science & Mathematics ➔ Biology
ribose or deoxyribose sugars and phosphates
2006-11-25 06:06:38 · answer #1 · answered by pdigoe 4 · 0⤊ 0⤋
The sides of the ladder are the deoxyriboses (these are ribose sugars with an hydroxyl replaced by a hydrogen), and phosphate groups. These two form the string of nucleotides by attaching to each other covalently forming what is known as a phosphodiester bond.
The nucleotides could be a pyrimidine or a purine, both types of molecules have rings. The DNA 'ladder' or double helix is finally formed by hydrogen bonds between a pyrimidine in one strand and a purine in the other.
Hope my explanation helps you (and that it is understandable!), if you need more help feel free to e-mail me.
2006-11-25 06:57:19 · answer #2 · answered by livarizmendi 2 · 0⤊ 0⤋
The sides of the ladder are formed with sugar and phosphates. The rungs are the purine and pyrimidine hydrogne bonding portions of the base.
2006-11-25 06:08:51 · answer #3 · answered by Carl D 4 · 0⤊ 0⤋
phosphates and a sugar deoxyribose
2006-11-25 06:06:35 · answer #4 · answered by maussy 7 · 0⤊ 0⤋