California Science Test (CAST) Practice Exam

What term describes a classification grouping that contains similar, closely related organisms?

Prokaryote Eukaryote Genus Solution

Correct Answer:

Genus

Explanation:

Grouping similar and closely related organisms is described by a genus, a rank in biological classification. Genus sits above species and below family, and it collects species that share strong similarities and a common evolutionary history. For example, many species that look alike and behave in related ways are placed in the same genus. This helps scientists organize biodiversity in a systematic way. Prokaryote and eukaryote describe cellular organization—whether organisms have a nucleus and other cellular features—rather than grouping closely related organisms. A solution is just a mixture of substances and isn’t a biological classification term.

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