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A repeat unit or repeating unit (or mer) is a part of a polymer whose repetition would produce the complete polymer chain (except for the end-groups) by linking the repeat units together successively along the chain, like the beads of a necklace.
Repeated sequences (also known as repetitive elements, repeating units or repeats) are short or long patterns that occur in multiple copies throughout the genome.In many organisms, a significant fraction of the genomic DNA is repetitive, with over two-thirds of the sequence consisting of repetitive elements in humans. [1]
DNA is a long polymer made from repeating units called nucleotides. [6] [7] The structure of DNA is dynamic along its length, being capable of coiling into tight loops and other shapes. [8] In all species it is composed of two helical chains, bound to each other by hydrogen bonds.
A polymer which contains only a single type of repeat unit is known as a homopolymer, while a polymer containing two or more types of repeat units is known as a copolymer. [22] A terpolymer is a copolymer which contains three types of repeat units. [23] Polystyrene is composed only of styrene-based repeat units, and is classified as a homopolymer.
In chemistry and biochemistry, an oligomer (/ ə ˈ l ɪ ɡ ə m ər / ⓘ) is a molecule that consists of a few repeating units which could be derived, actually or conceptually, from smaller molecules, monomers. [1] [2] [3] The name is composed of Greek elements oligo-, "a few" and -mer, "parts". An adjective form is oligomeric. [3]
Protein tandem repeats can be either detected from sequence or annotated from structure. Specialized methods were built for the identification of repeat proteins. [13] Sequence-based strategies, based on homology search [14] or domain assignment, [15] [16] mostly underestimate TRs due to the presence of highly degenerate repeat units. [17]
The current understanding [25] is that repeating nucleosomes with intervening "linker" DNA form a 10-nm-fiber, described as "beads on a string", and have a packing ratio of about five to ten. [18] A chain of nucleosomes can be arranged in a 30 nm fiber , a compacted structure with a packing ratio of ~50 [ 18 ] and whose formation is dependent ...
A polyamide is a polymer with repeating units linked by amide bonds. [1]Polyamides occur both naturally and artificially. Examples of naturally occurring polyamides are proteins, such as wool and silk.