In prokaryotic organisms, nuclear region is not surrounded by a membrane. This undefined nuclear region is known as

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NDA (Held On: 6 Sep 2020) General Ability Test Previous Year paper
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  1. Nucleic acid
  2. Nucleoid
  3. Nucleolus
  4. Nucleosome

Answer (Detailed Solution Below)

Option 2 : Nucleoid
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NDA 01/2025: English Subject Test
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The correct answer Nucleoid.

  • In prokaryotic organisms, the nucleus region is not surrounded by a membrane.
  • This undefined nuclear region is known as Nucleoid.

Key Points

  • Prokaryotic cells are primitive organisms.
  • Nucleoid in a prokaryote contains all or most of the genetic material
  • In prokaryotic cells, the nucleus is not defined properly because it is not surrounded by a nuclear membrane.

Additional Information

  • Difference between Prokaryotic and Eukaryotic Cells:
  Prokaryotes Eukaryotes
Type of Cell Always unicellular Unicellular and multi-cellular
Nucleus Absent Present
DNA arrangement Circular Linear
Mitochondria Absent Present
Endoplasmic reticulum Absent Present
Cell division Through binary fission Through mitosis
Reproduction Asexual Both asexual and sexual

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