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Question

The two strands of DNA double helix are

A
Coiled side by side
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B
Twisted around each other like the strands of a two-stranded rope with free ends
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C
Alike in terms of having same base pairs
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D
Non-helical structures
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Solution

The correct option is A 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. 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.


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