![]() This pairing structure keeps the distance between the two backbones of phosphate-linked deoxyribose sugar molecules roughly equal. phosphate, sugar, ond nitrogen base units. Specifically, Adenine (A), a purine base, always pairs with Thymine (T), a pyrimidine base, while Guanine (G), a purine base, always pairs with Cytosine (C), a pyrimidine base. Transcribed Image Text: The backbone of a strand of nuclelc acid consists of Multiple Choice phosphate units only sugar units only. Why is this important? Well 2-rings take up more room than 1-ring, so it helps us make sense of why the bases like to “pair” the way they do. The important difference between these two groups is that purine bases (A & G) have a 2-ring structure, while pyrimidine bases (C & T) have a 1-ring structure. In DNA and RNA, a nitrogenous base forms a bond with a 5-sided carbon sugar molecule, which forms a backbone for the entire molecule. The sugarphosphate groups line up in a backbone for each single strand of DNA, and the nucleotide bases stick out from this backbone. These four bases can be further subdivided into groups of the purine bases (A & G) and the pyrimidine bases (C & T). forms the backbone of DNA and forms the inside. -the alternating phosphate and sugar held by phosphodiester bonds are the backbone of the helix. The sugar-phosphate backbones of the DNA strands make up the outside of the helix, while the nitrogenous bases are found on the inside and form hydrogen-bonded pairs that hold the DNA strands together. Attached to each deoxyribose sugar molecule in the DNA backbone is one of four nitrogen-containing bases: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G). Which shows the correct complementary base pairing for DNA answer choices C-A, T-G A-G, C-T C-G, U-A T-A, G-C Question 3 120 seconds Q. The structure of DNA, as represented in Watson and Crick's model, is a double-stranded, antiparallel, right-handed helix. These deoxyribose sugar molecules are linked to each other in long chains by their associated phosphate groups, creating the “backbone” of the DNA structure. ![]()
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