The exposed position of the rider
I believe the answer is A, The pace it occupies.
If there is a distinct colour change from the blue (copper sulphate in the Bendict's reagent) then there is a reducing sugar. If there is a green, yellow, orange or red insoluble solution formed then there is a reducing sugar present. ( From green to red - increasing amount of reducing sugar)
Answer:
double helix, which is made up of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group. There are four nitrogenous bases in DNA, two purines (adenine and guanine) and two pyrimidines (cytosine and thymine).
Explanation: