What refers to the order of nitrogenous bases on a DNA chain?

The term that refers to the order of nitrogenous bases on a DNA chain is "base sequence." A base sequence describes the specific order in which the adenine (A), thymine (T), cytosine (C), and guanine (G) bases are arranged within the DNA molecule. This sequence is crucial because it determines the genetic information carried by that segment of DNA.

The base sequence is integral to various biological processes, including transcription and translation, where the information encoded in the DNA base sequence is used to synthesize proteins. Understanding the base sequence is also essential for genetic mapping, evolutionary studies, and biotechnology applications.

While "base pairing" refers to the hydrogen bonding between complementary nitrogenous bases (i.e., adenine pairing with thymine and cytosine pairing with guanine), it does not describe the order of bases on the DNA strand. "Nucleotide arrangement" might imply the organization of the entire nucleotide structure in DNA, which includes a sugar, phosphate group, and nitrogenous base, but it does not specifically indicate the sequence of the nitrogenous bases themselves. "Genetic sequence" is a broader term that encompasses the entire sequence of bases in a DNA or RNA molecule, but in this context, "base sequence