Which statement best describes diploid cells?

• A. The cells always exist in pairs.
• B. The cells contain two nuclei.
• C. Their chromosomes exist in pairs.
• D. Diploid cells are the germ cells.

Answer: (C)

Diploid cells have two complete sets of chromosomes, arranged in homologous pairs. In humans that means 46 chromosomes forming 23 pairs, with one member of each pair coming from each parent. This pairing defines diploidy and supports genetic inheritance and recombination during cell division. It isn’t about having two nuclei, nor about existing in pairs as cells, and germ cells are not defined as diploid organisms by themselves (they are diploid before meiosis but become haploid as gametes). So the best description is that their chromosomes exist in pairs.