What does a prokaryote cell lack?

Quite a lot of things - for example, a college education.

Is there any specific thing you're looking for it to lack? Are you comparing it to another type of cell?

A prokaryotic cell lacks a nucleus.

A nucleus is an organelle containing the DNA/genes and completely enclosed by a double membrane. Some nerdy biologists say the nucleus is "bounded" by a membrane. In the same way your house is "bounded" by four walls, a floor, and a roof.

Quote:

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a cell that lacks a membrane-bonded nucleus

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So "membrane - BOUNDED (not bonded) nucleus"