In a 3-D Double Helix Model of DNA,the Center Consists

Question

In a 3-D double helix model of DNA,the center consists of ____.  
A) deoxyribose sugars
B) nitrate groups
C) nucleotide base pairs
D) phosphate groups
E) sugar-phosphate backbones

Accepted Answer

In a 3-D double helix model of DNA, the center consists of nucleotide base pairs, specifically adenine (A) pairing with thymine (T) and cytosine (C) pairing with guanine (G). The base pairs are held together by hydrogen bonds, forming the rungs of the DNA ladder. The deoxyribose sugars and phosphate groups make up the sugar-phosphate backbones which run along the outside of the helix. Nitrate groups are not present in DNA.