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0 of 12 pairs
Tap the first empty slot on the bottom strand, then choose its partner base. You can also type A, T, G or C.
The pairing rule
| Base | Always pairs with |
|---|---|
| A — adenine | T — thymine |
| G — guanine | C — cytosine |
Reading the code
Cells read DNA three letters at a time. Each three-letter codon stands for one building block of a protein.
Did you know
If you uncoiled the DNA in one human cell, it would stretch about 2 meters — packed into a nucleus far too small to see.