The statement that is true about chromosomes is: Chromosomes contain DNA.
Here’s a brief clarification for the other statements:
- Chromosomes are found in sets of three. This is incorrect; chromosomes are usually found in pairs (diploid) in body cells, or in singles (haploid) in gametes.
- The same number of chromosomes appears in haploid and body cells. This is also incorrect; body cells (somatic cells) typically have a diploid number of chromosomes, whereas haploid cells (gametes) have half the number.
- DNA contains chromosomes. This is incorrect as well; rather, chromosomes are structures composed of DNA and proteins.
Therefore, the first statement is the correct one.
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