Multiple choice

Nucleus is present in

  1. prokaryotes

  2. eukaryotes

  3. viruses

  4. Both (1) and (2)

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The defining difference between prokaryotic and eukaryotic cells is the presence of a membrane-bound nucleus. Eukaryotes possess a true nucleus enclosed by a nuclear envelope that houses their DNA, while prokaryotes lack this membrane-bound structure and have their DNA free in the nucleoid region. Viruses are not cellular and lack any internal organelles or cellular organization altogether. Therefore, only eukaryotes contain a nucleus.

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