When nucleotides join together in a series, they form a structure known as a polynucleotide. Single-stranded polynucleotide chains exist, mostly for chains made up of RNA, although in some instances, the same is true for DNA. Structure of Polynucleotide Chain. Deoxyribose and phosphate groups alternately make the backbone of each stand or polynucleotide chain. A nucleotide has three components – a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group. It is a long chain polynucleotide which exist in a regular conformation like a double-chain DNA although some viruses [e.g., reoviruses and wound tumour virus) have double stranded RNA. C Polynucleotides. Which statement(s) accurately describe(s) the structure of single-stranded polynucleotides? The sugar is deoxyribose in DNA and ribose in RNA. Structure of Ribose Nucleic Acids: It is also a polynucleotide but the pentose ribose has a free hydroxyl group in position 2′. A) Under in-vivo conditions, the stacking interactions will tend to form regions of single-chain, stacked-base helix. Each "rung" of the ladder is a pair of nitrogenous bases, one purine and one pyrimidine extending into the … In the Watson-Crick model of DNA structure, the polynucleotide chains ____ are orientated in opposite directions. It means, if one chain has the polarity 5'→ 3', the other has 3' → 5'. The two chains have anti-parallel polarity. The sugar in RNA nucleotides is. DNA is composed of two polynucleotide chains twisted into a helix 2 nm in diameter. ribose. The search for a(n) ____ treatment led to the discovery that DNA carries genetic information. In their mononucleotide form, nucleotides can have one, two, or three phosphates attached to them. Nucleotide Structure: Each nucleotide is made up of a sugar, a phosphate group, and a nitrogenous base. polyp The sessile form of life history in cnidarians; e.g., the freshwater hydra.. polynucleotide A nucleotide of many mononucleotides combined. DNA structure and characteristics. The sugar phosphate backbones of the two chains run parallel to each other in opposite directions. The salient features of the Double-helix structure of DNA are as follows: It is made of two polynucleotide chains, where the backbone is constituted by sugar-phosphate, and the bases project inside. Russian biochemist Phoebus Levene proposed the polynucleotide structure of nucleic acids in 1919 [20]. DNA molecules have two polynucleotide chains, held together in a ladderlike structure. polynucleotides Long chains of nucleotides formed by chemical links between the sugar and phosphate groups. 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