What is the main difference between Prokaryotic Cells and Eukaryotic Cells?

The main difference between Prokaryotic Cells and Eukaryotic Cells is based on nuclear membrane: Prokaryotic Cells — Absent — nucleoid region instead. Eukaryotic Cells — Present — well-defined nucleus. Prokaryotes lack membrane-bound organelles — this is the defining difference (NCERT Ch. 8)

Which is more important for NEET — Prokaryotic Cells or Eukaryotic Cells?

Both Prokaryotic Cells and Eukaryotic Cells are equally important for NEET as NTA tests their comparison directly. This topic falls under Cell: The Unit of Life. Key points to remember: Prokaryotes lack membrane-bound organelles — this is the defining difference (NCERT Ch. 8). 70S ribosomes in prokaryotes; 80S in eukaryotic cytoplasm — but eukaryotic mitochondria and chloroplasts have 70S (supports endosymbiotic theory). Prokaryotic DNA is circular and not associated with histones; eukaryotic DNA is linear and has histones.

Difference Between Prokaryotic Cells and Eukaryotic Cells — NEET Biology

The main difference between prokaryotic and eukaryotic cells is that prokaryotic cells lack a membrane-bound nucleus and organelles, while eukaryotic cells have a well-defined nucleus and membrane-bound organelles like mitochondria and ER. This comparison appears in NEET almost every year, with NTA testing ribosome types (70S vs 80S) and DNA organization.

Comparison Table: Prokaryotic Cells vs Eukaryotic Cells

Basis	Prokaryotic Cells	Eukaryotic Cells
Nuclear membrane	Absent — nucleoid region instead	Present — well-defined nucleus
Membrane-bound organelles	Absent (no mitochondria, ER, Golgi)	Present (mitochondria, ER, Golgi, lysosomes, etc.)
Ribosomes	70S (50S + 30S subunits)	80S (60S + 40S subunits) in cytoplasm; 70S in mitochondria/chloroplast
DNA	Circular, naked (no histones)	Linear, wrapped around histones (chromatin)
Cell size	Small (1–10 μm)	Larger (10–100 μm)
Cell wall	Present (peptidoglycan in bacteria)	Present in plants (cellulose), fungi (chitin); absent in animals
Cell division	Binary fission	Mitosis and meiosis
Plasmids	Present — extra-chromosomal circular DNA	Generally absent (except in yeast)
Cytoskeleton	Absent or minimal	Well-developed (microtubules, microfilaments)
Examples	Bacteria (E. coli), Cyanobacteria, Mycoplasma	Plant cells, animal cells, fungi, protists

Key Points to Remember

Prokaryotes lack membrane-bound organelles — this is the defining difference (NCERT Ch. 8)
70S ribosomes in prokaryotes; 80S in eukaryotic cytoplasm — but eukaryotic mitochondria and chloroplasts have 70S (supports endosymbiotic theory)
Prokaryotic DNA is circular and not associated with histones; eukaryotic DNA is linear and has histones
Mycoplasma is the smallest known cell and lacks a cell wall — a common NEET fact
Mesosome in prokaryotes is the infolding of the plasma membrane that aids in respiration and cell division

NEET Exam Tip

How NTA Tests ThisNTA's favorite trap: 'Which organelle is found in both prokaryotes and eukaryotes?' — Ribosomes (but different types: 70S vs 80S). Multi-statement questions often mix true/false facts: 'Prokaryotes have histones' (FALSE), 'Eukaryotic mitochondria have 70S ribosomes' (TRUE). Know exceptions like Mycoplasma (no cell wall) and cyanobacteria (have photosynthetic membranes but no chloroplasts).

Master NEET Biology with MedicNEET

12,771+ questions covering all Biology chapters — including comparison-based questions that match NTA's exact framing patterns.

View Plans Free PYQ Practice

Difference Between Prokaryotic Cells and Eukaryotic Cells — NEET Biology

Comparison Table: Prokaryotic Cells vs Eukaryotic Cells

Key Points to Remember

NEET Exam Tip

Practice & Study Resources

Cell: The Unit of Life — PYQs

Cell: The Unit of Life — Chapter Questions

All Biology PYQs

Master NEET Biology with MedicNEET