In DNA the complementary bases are adenine and thymine, guanine and cytosine.
What is DNA?
DNA is a group of molecules that is responsible for carrying and transmitting the hereditary materials or the genetic instructions from parents to offspring. DNA comprises a sugar-phosphate backbone and the nucleotide bases which are guanine, cytosine, adenine and thymine.
- Adenine and guanine, as well as thymine and cytosine, are complementary bases in DNA.
- A nitrogen-containing base, such as guanine (G), adenine (A), thymine (T), or cytosine (C), as well as a monosaccharide sugar called deoxyribose and a phosphate group, make up each nucleotide in DNA.
- Covalent bonds between the sugar of one nucleotide and the phosphate of the next form a chain of nucleotides, consisting in an alternating sugar-phosphate backbone.
- Hydrogen bonds attach the nitrogenous bases of the two different polynucleotide strands to form double-stranded DNA, as per base pairing rules that is A with T and C with G.