Answer :

Final answer:

The backbone in a nucleic acid strand is called the sugar-phosphate backbone, and it is formed by phosphodiester bonds linking alternating sugar and phosphate groups. These bonds determine the directionality of the nucleic acid strand.


Explanation:

Phosphodiester bonds are central to all life on Earth, forming the backbone of nucleic acids. This backbone, known as the sugar-phosphate backbone, consists of alternating sugar and phosphate groups linked by phosphodiester bonds. The directionality of this bond defines the orientation of nucleic acids.


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