Chromosome vs DNA
Quick answer: DNA is the polymer; a chromosome is a packaged DNA molecule (with proteins) as a cellular unit.
One eukaryotic chromosome contains one long DNA molecule (plus proteins) in the unreplicated state.
Use the table rows first for rapid contrast, then read the similarity and difference sections to lock in exam-ready language. Finish with the “when to use which term” guidance before attempting the self-checks.
Diagram
Side-by-side comparison
| Feature | Chromosome | DNA |
|---|---|---|
| Level | Cellular/genetic unit | Molecular polymer |
| Contents | DNA + proteins (chromatin) | Nucleotides only |
| Visibility | Condensed forms visible by light microscopy | Too thin to see as molecules in class microscopes |
| Counting | Chromosome number / karyotype | Base pairs / genome size |
| Ends | Telomeres on linear chromosomes | Chemical polymer ends |
| Packaging | Already packaged | Needs packaging in eukaryotes |
Similarities
Chromosomes contain DNA.
Both carry genetic information.
Differences
DNA is chemistry; chromosome is organized cellular package.
Chromosome number ≠ DNA base count language.
When each term applies
Use DNA for sequence lessons.
Use chromosome for mitosis and karyotypes.
Common confusion
“Human DNA has 46 chromosomes” is sloppy; humans have 46 chromosomes made of DNA.
Common questions
Does a chromosome contain proteins?
Yes.
Is DNA synonymous with chromosome?
No.
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