Cell Size Variation and Examples — NEET Biology
📚 Practice ConceptCells differ greatly in size, shape and activities. For example, Mycoplasmas, the smallest cells, are only 0.3 μm in length while bacteria
Consider the following statements: 1. Ribosomes are present in both prokaryotic and eukaryotic cells, and are also found inside chloroplasts and mitochondria. 2. Mycoplasma are the smallest known cells, about 0.3 µm in size, and lack a cell wall. 3. Animal cells possess centrioles while most plant cells lack them. 4. In eukaryotes, the cytoplasm lacks membrane-bound organelles; only ribosomes are present. 5. Bacterial flagellum is structurally identical to eukaryotic flagellum, both showing the 9+2 arrangement of microtubules. Which of the above statements are correct?
View solution & NCERT explanation
Correct answer: A — 1, 2 and 3 only
Statement 1 Correct: Ribosomes occur in all cells, and also inside chloroplasts and mitochondria. Statement 2 Correct: Mycoplasma are the smallest cells (0.3 µm), without a cell wall. Statement 3 Correct: Centrioles are in animal cells, absent in almost all plant cells. Statement 4 Incorrect: Eukaryotic cells have membrane-bound organelles (ER, Golgi, lysosomes, mitochondria, plastids, etc.), not just ribosomes. Statement 5 Incorrect: Prokaryotic flagellum is structurally different; only eukaryotic flagella show the 9+2 microtubule arrangement.
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.