a.
two backbones of alternating deoxyribose and nitrogenous base on the exterior, with phosphates on the interior
b.
two backbones of alternating deoxyribose and nitrogenous base on the interior, with phosphates on the exterior
c.
two backbones of alternating deoxyribose and phosphate on the exterior, with nitrogenous bases on the interior
d.
two backbones of alternating deoxyribose and phosphate on the interior, with nitrogenous bases on the exterior
e.
two backbones of alternating nitrogenous base and phosphate on the exterior, with deoxyriboses on the interior