What is different about every nucleotide of a DNA molecule?

a) the deoxyribose sugar
b) the phosphate group
c) the shape of the molecule
d) the nitrogen bases

it's the nitrogen bases, am i correct?

In a DNA nucleotide, the nitrogen-containing the nitrogen bass, they may be one of four types: adenine, thymine, cytosine and guanine

Yes, you are correct. The nitrogen bases are what differentiate each nucleotide of a DNA molecule. There are four different nitrogen bases found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). The sequence of these nitrogen bases along the DNA molecule determines the genetic information encoded within the DNA.

Yes, you are correct. The nitrogen bases are what differentiate each nucleotide of a DNA molecule. The four different nitrogen bases found in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G). These bases pair up to form the "rungs" of the DNA double helix structure. Adenine always pairs with thymine (A-T), and cytosine always pairs with guanine (C-G). This pairing is known as complementary base pairing. The sequence or order in which these nitrogen bases occur along the DNA molecule is what encodes the genetic information.