Here's a breakdown:
In DNA:
* Adenine (A) always pairs with Thymine (T) via two hydrogen bonds.
* Guanine (G) always pairs with Cytosine (C) via three hydrogen bonds.
In RNA:
* Adenine (A) always pairs with Uracil (U) via two hydrogen bonds.
* Guanine (G) always pairs with Cytosine (C) via three hydrogen bonds.
Key points:
* Specificity: Each base only pairs with its specific complementary partner.
* Hydrogen bonds: The pairing is facilitated by hydrogen bonds, which are weak bonds formed between the bases.
* Double helix: In DNA, these complementary base pairs form the rungs of the double helix structure.
* Genetic code: The sequence of bases along a DNA strand carries the genetic code, which dictates the production of proteins.
* Transcription & Translation: The complementary base pairing rules are essential for the processes of transcription (DNA to RNA) and translation (RNA to protein).
These rules are crucial for understanding the structure, replication, and function of genetic material, making them a core concept in molecular biology.
