DNA is like a twisted ladder. What are the 'rungs' (the steps) of the ladder made of?

The rungs are made of chemical letters.

DNA Base Pairings

Name: DNA Base Pairings
Author: Insta~Lesson

1st Grade · Science · 30 min

I can describe DNA has different bases that link up with one another

1
DNA is a giant molecule that looks like a twisted ladder.
2
The rungs of the DNA ladder are made of four letters: A, T, G, and C.
3
The cell's library, called the nucleus, holds the DNA, which tells the cell how to make proteins.

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