A set of two bonded nucleotides on opposite strands of DNA. There are two possible base pairs: C-G and A-T.
Pairs of complementary nitrogenous bases that interact to form each rung of DNA's double helix. Adenine (A) pairs with thymine (T); cytosine (C) pairs with guanine (G).
The length of a piece of DNA is often referred to in terms of how many base pairs are present in it. For example, the piece below would be 6 base pairs long (the dotted lines represent the sugar-phosphate backbones of the DNA).------------ A T C G C A | | | | | | T A G C G T
A complementary building block consisting of a pair of two DNA bases (adenine with thymine, and cytosine with guanine) and represented by one of the rungs within a double stranded DNA molecule.
Part of the structure of the repeating units of DNA. The sequence of base pairs makes up the genetic code. Bases pair up according to the rule A – T and G – C.
Two bases held together by weak chemical bonds. The double helix shape of DNA is dependent on its two strands being held together by the bonds between the base pairs. In DNA, the bases that pair are adenine with thymine and guanine with cytosine.
the pairs of complementary bases that form the rungs of DNA: adenine (A) pairs with thymine (T), cytosine (C) pairs with guanine (G).
the two complementary, nitrogen-rich molecules held together by weak chemical bonds. Two strands of DNA are held together in the shape of a double helix by the bonds between their base pairs. (See Chemical base.)
The building blocks of the DNA molecule
Weak hydrogen bonds formed between the two strands of the double-helical DNA through the bases on each strand. The bases on opposite strands are said to be complementary. The purine base, adenine, is always opposite the pyrimidine base, thymine, and the purine base, guanine, is always opposite the pyrimidine base, cytosine.
Pairs of complementary bases forming the DNA structure; the units used to measure the length of DNA. Base pairs consist of adenine (A), which must always pair with thymine (T), and guanine (G), which must always pair with cytosine (C).
In double-stranded DNA, the bases of one strand are hydrogen-bonded to those of the other strand to form specific base pairs: adenin-thymine (A-T) and guaninecytosine (G-C). Base pairing is one of the most important features of the DNA structure. It ensures that (1) the base sequence of the two strands are complementary, (2) the replica of each strand is given the base sequence of its complementary strand, and (3) the base sequence of DNA is easily transcribed into RNA molecule. The number of base pairs is used as a measure of the size of the DNA fragment. Often expressed as kilobases (103 bases) or kb.
