which of the following correctly organizes these genetic terms in order from smallest to largest

The correct organization of genetic terms from smallest to largest is:

1. Nucleotide (smallest unit, building block of DNA)
2. Gene (segment of DNA with instructions)
3. DNA molecule (long double helix of nucleotides)
4. Chromosome (largest, coiled DNA molecule containing many genes)

So the order is: nucleotide, gene, DNA molecule, chromosome.