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What is a prokaryote?

  1. A unicellular multicellular organism

  2. A unicellular organism with a nucleus

  3. A multicellular organism with a nucleus

  4. A unicellular organism without a nucleus

The correct answer is: A unicellular organism without a nucleus

A prokaryote is a type of organism that is unicellular and does not have a nucleus. This sets it apart from eukaryotes, which are unicellular or multicellular organisms with a nucleus. Option A, a unicellular multicellular organism, is contradictory and cannot be true. Option B, a unicellular organism with a nucleus, is incorrect because that describes a eukaryote. Option C, a multicellular organism with a nucleus, is incorrect because that also describes a eukaryote. Therefore, the correct answer is D, a unicellular organism without a nucleus.