Here's how we arrive at that:
* Base pairing rules: In DNA, adenine (A) always pairs with thymine (T), and cytosine (C) always pairs with guanine (G).
* Complementary strand: To find the complementary strand, we simply replace each base in the original sequence with its corresponding pair:
* c becomes g
* t becomes a
* t becomes a
* a becomes t
* g becomes c
* g becomes c
* c becomes g
* t becomes a
* t becomes a
* a becomes t
* c becomes g
* c becomes g
* a becomes t
Therefore, the complementary strand is gaatcgaaatggt.
