base pair

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base pair (b.p., bp),

the complex of two heterocyclic nucleic acid bases, one a pyrimidine and the other a purine, brought about by hydrogen bonding between the purine and the pyrimidine; base pairing is the essential element in the structure of DNA proposed by J. Watson and F. Crick in 1953; usually guanine is paired with cytosine (G·C), and adenine with thymine (A·T) or uracil (A·U).
Farlex Partner Medical Dictionary © Farlex 2012

base pair

n.
A pair of nitrogenous bases, consisting of a purine linked by hydrogen bonds to a pyrimidine, that connects the complementary strands of DNA or of hybrid molecules joining DNA and RNA. The base pairs are adenine-thymine and guanine-cytosine in DNA, and adenine-uracil and guanine-cytosine in RNA.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

base pair

The structure formed between 2 complementary nitrogenous bases—purines and pyrimidines—which are hydrogen-bonded (guanine and cytosine share 3 hydrogen bonds; adenine and thymine share 2) to form double-stranded nucleic acids—DNA or RNA.

BPs are held together by weak hydrogen bonds; in double-stranded nucleic acids (DNA, RNA), purines (adenine and guanine) bond to their complementary opposites, pyrimidines (cytosine thymine, uracil)—under normal circumstances, adenine binds to thymine (DNA) or to uracil (RNA), and guanine binds to cytosine (DNA and RNA).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

base pair

(bās pār)
The complex of two heterocyclic nucleic acid bases, one a pyrimidine and the other a purine, brought about by hydrogen bonding between the purine and the pyrimidine; base pairing is the essential element in the structure of DNA. Usually guanine is paired with cytosine (G·C), and adenine with thymine (A·T) or uracil (A·U). The sequence of the complementary bases in either strand of a two-stranded DNA molecule codes for amino acids used in the manufacture of proteins. Trios of bases (codons) specify each of 20 amino acids. During protein synthesis (translation), messenger RNA and ribosomes read the order of amino acids from strings of DNA to create protein chains, which are then released into the cell.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

base pair

Two linked molecules, one a purine the other a pyrimidine, that lie across between the two strands of the DNA double helix. The bases are linked by easily-broken hydrogen bonds and the linkage occurs only in a particular, complementary, way-adenine with thymine and guanine with cytosine. This is the essence of DNA replication, which starts with the separation of a length of the two strands at bonds. In RNA, uracil replaces thymine and adenine links with it. Distance along a DNA sequence is measured as the number of base pairs.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

base pair (bp)

in double-stranded NUCLEIC ACID molecules, a pair of complementary NUCLEOTIDES: in DNA, A-T and G-C; in RNA, A-U and G-C, with one nucleotide contributed from each strand of the DUPLEX. The pair of bases is held together by HYDROGEN BONDS. The length of a double-stranded nucleic acid molecule is measured in base pairs. See also COMPLEMENTARY BASE PAIRING.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
(4) Seed region with 6 base pairs and starting from positions 2-5, may have only one G=U base-pair in between seed region.
The modeling was performed according to Figure 2 schema and results are presented in Table 1 where nearest positions between the S atom of Ajoene and O and N atoms of G-C, A-T, and the base pairs bridge are shown.
Most have focused on individual DNA base pair changes, often called single nucleotide polymorphisms, or SNPs.
lahorensis SSU rRNA consisted of 117 terminal and internal loops and 564 base pairs. The free energy of this structure was -380.71 kcal at 37C.
Next, we examined the ability of KF [exo.sup.-] to extend primers past various primer-template base pairs (Figure 3).
Since the late 1990s, the creation of unnatural base pairs for new biological systems has competitively and rapidly advanced.
Integrated DNA Technologies' gBlocks Gene Fragments are double-stranded, sequence-verified genomic blocks up to 500 base pairs. Their high sequence fidelity and rapid delivery time make them suitable for a range of biology applications, including easy assembly of multiple gene fragments to reliably generate larger gene constructs.
Venter and his colleagues modified the DNA of a Mycoplasma, a kind of bacteria, creating a final strand composed of roughly one million "base pairs," the components which make up DNA.
An amplicon of 1 223 base pairs was detected using polymerase chain reaction with primers designed to target the hexon gene of FadV-4.
This insight into the 550 million base pairs of the cocoa plant will help growers select the right plants to breed based on genes that produce such desirable traits as flavor or disease resistance.
But it is chock full of mysteries hidden in its 12 chromosomes and 840 million DNA base pairs. Humans, by comparison, have 3 billion DNA base pairs.