DNA is a polymer monomer units of DNA nucleotides, and the polymer is known as a polynucleotide " Each nucleotide consists of five-carbon sugar (deoxyribose), a nitrogen-containing base attached to sugar and phosphate groups There are four types of nucleotides found in DNA, differing only in the nitrogen Four nucleotides are given a letter abbreviation as an abbreviation of the four bases
• A for adenine
• G is guanine
• C is for cytosine
• T thymine
DNA Backbone
DNA is a polymer chain with a sequence of alternating sugar-phosphate deoxyribose groups entered the second 3'-hydroxyl and 5'-phosphate hydroxyl groups in ester links, also known as "phosphodiester" bonds
DNA double helix
DNA macromolecule is a normal double helix Two polynucleotide chains, held together by weak thermodynamic forces, form the DNA molecule
Characteristics of the DNA double Helix
• Two strands of DNA forming a helical spiral, winding around the helix axis spiral right
• two polynucleotide chains running in opposite directions
• The sugar-phosphate backbone of the two DNA strands wind around the helix as a fence line spiral stairs
• Basics of specific nucleotides in helix, stacked one above the other like a spiral staircase
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