Question

chromosome
gene
cell
dna
nucleus

Explanation:

To solve the problem of ordering these biological structures from smallest to largest (or vice versa, depending on the context, but typically from smallest to largest in terms of size and organizational level), we analyze the hierarchy of genetic and cellular components:

Step 1: Recall the biological hierarchy

• A gene is a segment of DNA.
• DNA is organized into chromosomes (DNA + proteins).
• The nucleus is an organelle within a cell that contains chromosomes.
• The cell is the basic unit of life, with the nucleus (and its contents) inside it.

Step 2: Order from smallest to largest (or most basic to most complex)

From smallest (most basic) to largest (most complex):

1. Gene (smallest, a segment of DNA)
2. DNA (composed of many genes)
3. Chromosome (DNA packaged with proteins)
4. Nucleus (organelle containing chromosomes)
5. Cell (contains the nucleus and other organelles)

If the task is to order from smallest to largest, the sequence is:
$\boldsymbol{\text{Gene} < \text{DNA} < \text{Chromosome} < \text{Nucleus} < \text{Cell}}$

If the problem asks for labeling (e.g., numbering 1–5 from smallest to largest), the order would be:

1. Gene
2. DNA
3. Chromosome
4. Nucleus
5. Cell

(Note: If the question specifies a different direction, adjust accordingly, but the biological hierarchy is consistent.)

Answer:

From smallest to largest: Gene, DNA, Chromosome, Nucleus, Cell (or numbered as 1: Gene, 2: DNA, 3: Chromosome, 4: Nucleus, 5: Cell).