Cell biology — prokaryotes: Prokaryotic cells lack which structural feature found in eukaryotes? Answer with the defining feature absent in prokaryotes. Choose the correct feature.

Difficulty: Easy

A true nucleus with a nuclear membrane
Ribosomes for protein synthesis
Plasma (cell) membrane
DNA as genetic material

Correct Answer: A true nucleus with a nuclear membrane

Explanation:

Concept / Approach
Prokaryotes lack a membrane-bound nucleus and other membrane-bound organelles. Their DNA resides in a nucleoid region without a nuclear envelope.

Why others are incorrect
Prokaryotes do have ribosomes (70S), a plasma membrane, and DNA.

Final Answer
Lack of a true nucleus (nuclear membrane) is the defining absence.

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