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Base pair

any of the pairs of the hydrogen-bonded purine and pyrimidine bases that form the links between the sugar-phosphate backbones of nucleic acid molecules: the pairs are adenine and thymine in DNA, adenine and uracil in RNA, and guanine and cytosine in both DNA and RNA.

base pair n.
The pair of nitrogenous bases that connects the complementary strands of DNA or of double-stranded RNA and consists of a purine linked by hydrogen bonds to a pyrimidine: adenine-thymine and guanine-cytosine in DNA, and adenine-uracil and guanine-cytosine in RNA.
base pair
Any of the pairs of nucleotides connecting the complementary strands of a molecule of DNA or RNA and consisting of a purine linked to a pyrimidine by hydrogen bonds. The base pairs are adenine-thymine and guanine-cytosine in DNA, and adenine-uracil and guanine-cytosine in RNA or in hybrid DNA-RNA pairing. Base pairs may be thought of as the rungs of the DNA ladder.


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  • Base pairing

    the process of binding separate DNA sequences by base pairs. noun (biochem) the hydrogen bonding that occurs between complementary nitrogenous bases in the two polynucleotide chains of a DNA molecule base-pairing The hydrogen bonding of complementary nitrogen bases, one purine and one pyrimidine. Base-pairing occurs between the complementary strands of a DNA molecule or a […]

  • Base-pairing rules

    constraints imposed by the molecular structure of DNA and RNA on the formation of hydrogen bonds among the four purine and pyrimidine bases such that adenine pairs with thymine or uracil, and guanine pairs with cytosine.

  • Base path

    the prescribed course for a base runner on the field extending in designated areas between the bases. Historical Examples You timed that exactly, Joe, cried Robbie, and you came down that base path like a streak. Baseball Joe, Captain of the Team Lester Chadwick He flew along the base path at a rattling clip and […]

  • Base pay

    pay received for a given work period, as an hour or week, but not including additional pay, as for overtime work. Contemporary Examples The base pay is about $45,000, and it takes 22 long years to hit the $100,000 cap, according to the Department of Education. The $140,000 Janitors Azriel James Relph November 23, 2010 […]

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