Here's why:
* DNA structure: DNA is a double helix, with two strands running in opposite directions. Each strand consists of a sugar-phosphate backbone with nitrogenous bases attached.
* Base pairing: The bases on one strand pair specifically with the bases on the other strand:
* Adenine (A) always pairs with Thymine (T)
* Guanine (G) always pairs with Cytosine (C)
* Replication: During replication, the two strands of DNA separate. Each strand then serves as a template for the synthesis of a new complementary strand. This ensures that each new DNA molecule is an exact copy of the original.
So, the ability of DNA to make a perfect copy of itself is due to the precise and predictable nature of its base pairing.
