The two strands of DNA double helix are
DNA is usually a double helix and has two strands running in opposite directions. It is twisted around each other like the strands of a two-stranded rope with free ends. DNA is usually a double-helix and has two strands running in opposite directions. Each chain is a polymer of subunits called as nucelotides. Each strand has a backbone made up of deoxyribose sugar molecules linked together by phosphate groups. The 3'C of a sugar molecule is connected through a phosphate group to the 5'C of the next sugar. This linkage is also called as 3-5' phosphodiester linkage. All DNA strands are read from the 5' to the 3' end where the 5' end terminates in a phosphate group and the 3' end terminates in a sugar molecule. Thus, the correct answer is option B.