* A sugar molecule: This is deoxyribose in DNA.
* A phosphate group: This is a negatively charged molecule that links nucleotides together.
* A nitrogenous base: There are four different nitrogenous bases in DNA:
* Adenine (A)
* Guanine (G)
* Cytosine (C)
* Thymine (T)
The order of these bases along the DNA molecule is what determines the genetic code.
So, in essence, DNA is a long chain of nucleotides linked together by phosphate groups, with the sequence of bases carrying the genetic information.
