Question

which of the following correctly organizes these genetic terms in order from smallest to largest?
chromosome, gene, nucleotide, dna molecule
nucleotide, gene, dna molecule, chromosome
dna molecule, nucleotide, gene, chromosome
dna molecule, nucleotide, chromosome, gene

Explanation:

To solve this, we recall the hierarchy of genetic structures:

• A nucleotide is the basic building block of DNA (e.g., A, T, C, G with a sugar and phosphate).
• Multiple nucleotides form a gene (a segment of DNA that codes for a trait).
• Multiple genes (and non - coding DNA) form a DNA molecule (a long double - helix structure).
• Multiple DNA molecules (along with proteins like histones) are packaged into a chromosome.

So the order from smallest to largest is nucleotide → gene → DNA molecule → chromosome.

Answer:

B. nucleotide, gene, DNA molecule, chromosome (assuming the second option is labeled B; if the options are unlabeled by identifier, the correct one is "nucleotide, gene, DNA molecule, chromosome")