The true statement about chromosomes is:
d. DNA contains chromosomes.
To clarify the other options:
- a. The same number of chromosomes appears in haploid and body cells: This is false because haploid cells have half the number of chromosomes compared to diploid body cells.
- b. Chromosomes are found in sets of three: This is misleading; chromosomes are typically found in pairs (diploid) or singular (haploid), not in sets of three.
- c. Chromosomes are found in sets of three: This is also misleading for the same reason as option b.
Therefore, option d is the correct choice.