Because cells share similar structure, all cells carry out the same function in living organism true or false

That is false. If all cells had the same function, then we would only be able to do one thing. Because of the diversity of the cells that we have, we are able to carry out many functions such as eating, drinking, moving, growing, blinking, etc. Hope I helped :)

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.