In DNA:
* Adenine (A) pairs with Thymine (T) through two hydrogen bonds.
* Guanine (G) pairs with Cytosine (C) through three hydrogen bonds.
In RNA:
* Adenine (A) pairs with Uracil (U) through two hydrogen bonds.
* Guanine (G) pairs with Cytosine (C) through three hydrogen bonds.
Why are complementary base pairs important?
* Genetic code: The sequence of these base pairs forms the genetic code that determines the order of amino acids in proteins.
* DNA replication: During DNA replication, the two strands of DNA separate, and each strand acts as a template for the synthesis of a new complementary strand.
* Transcription and translation: During transcription, DNA is used as a template to create RNA. The RNA molecule is also based on complementary base pairing. In translation, RNA is used to direct the synthesis of proteins.
* Stability of DNA: The hydrogen bonds between complementary base pairs contribute to the overall stability of the DNA molecule.
Summary:
Complementary base pairing is a fundamental principle in molecular biology. It is essential for the structure, function, and replication of DNA and RNA. The specific base pairing rules ensure that genetic information is accurately copied and transmitted from generation to generation.
