Which term describes a cell that contains two sets of chromosomes?

The term that describes a cell containing two sets of chromosomes is "diploid." In a diploid cell, chromosomes exist in pairs, with one set inherited from each parent. This is the typical state of somatic (body) cells in most organisms, including humans, where each cell contains a total of 46 chromosomes organized into 23 pairs.

Haploid cells, in contrast, contain only one set of chromosomes and are typically found in gametes (sperm and egg cells), which is why they are crucial for sexual reproduction. Gametes are essential for combining genetic material from two individuals, resulting in a diploid zygote upon fertilization. Chromatids refer to the replicated forms of a chromosome that are joined together by a centromere during cell division, but they do not define the number of chromosome sets in a cell. Thus, "diploid" is the correct term for a cell with two sets of chromosomes.