A kilobase, also referred to as kilobase pair, Kb, and Kbp, is literally one thousand base pairs; this is a measure of the length of a piece of nucleic acid (DNA or RNA). Because nucleic acids in the wild are normally double-stranded, each nucleotide is normally matched up with its complement to form a 'base pair'. Accordingly, a fragment of DNA 1,000 bases long in its single-stranded ('denatured' or 'melted') state will be 1,000 base pairs long in its normal double-stranded state. In genetics, two nucleotides on opposite complementary DNA or RNA strands that are connected via hydrogen bonds are called a base pair (often abbreviated bp). ... A nucleic acid is a complex, high-molecular-weight biochemical macromolecule composed of nucleotide chains that convey genetic information. ... Space-filling model of a section of DNA molecule Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions specifying the biological development of all cellular forms of life (and many viruses). ... Ribonucleic acid (RNA) is a nucleic acid consisting of a string of covalently-bound nucleotides. ... A nucleotide is a monomer or the structural unit of nucleotide chains forming nucleic acids as RNA and DNA. A nucleotide consists of a heterocyclic nucleobase, a pentose sugar, and a phosphate or polyphosphate group. ... The word complement (with an e in the second syllable, not to be confused with a different word, compliment with an i) has a number of uses. ... In biochemistry, a compound that has been denatured has lost its native state, or in other words, no longer has the shape that is most compact and allows for optimal biological activity. ...
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