Question

Which of the following correctly identifies a feature of double-stranded DNA?

a. the strands run parallel to one another in a helix, though one strand is longer than the other
b. one strand is 5' on both ends, and the other is 3' on both ends
c. one strand has nitrogen bases projecting outward, while the other has its bases projecting inward
d. the strands are identified and thus difficult to tell apart
e. each strand has a 3' end (unbound hydroxyl group) and a 5' end (hydroxyl group of deoxyribose sugar), the two strands run antiparallel to each other

Answer 1

Each strand has a 3' end (unbound hydroxyl group) and a 5' end (hydroxyl group of deoxyribose sugar), the two strands run antiparallel to each other. (Ans. E)

Step-by-step explanation:

DNA is known as Deoxyribonucleic acid. It is a complex organic molecular structure and present in all eukaryotes, prokaryotes and some viruses. For the transmission of inherited traits DNA codes genetic information.

It is a double-helix polymer consist of two spiral DNA strands fold around each other. Each strand of DNA is made up of a long chain of nucleotides. DNA's nucleotide consist phosphate group attached with deoxyribose sugar and nitrogenous bases two purine (adenine, guanine) and two pyrimidine (cytosine, thymine)

DNA have two distinct ends, one is 5'prime another is 3'prime. It means 5' and 3' carbon present on the sugar. 5' prime end consist phosphate group and 3' prime end consist hydroxyl group.