Q.1
Molecular Biology and Biotechnology- ICAR JRF/SRF 2024 (Q.72)
MCQ (Single Correct)
+4
−1
What is the diameter of the cytoskeletal fibre, microtubule?
- Microtubule Dimensions: Microtubules are hollow cylindrical polymers of $\alpha$-tubulin and $\beta$-tubulin heterodimers. They possess an outer diameter of approximately $24\text{ to }25\text{ nm}$ (often rounded up to $25-30\text{ nm}$ in standard cell biology examinations) and an inner lumen diameter of about $12-15\text{ nm}$.
- Comparison with Cytoskeletal Filaments: Microfilaments (actin filaments) have a diameter of about $6-8\text{ nm}$ (e.g., $7\text{ nm}$), while intermediate filaments measure about $10\text{ nm}$. Microtubules are the largest cytoskeletal elements with a diameter close to $25-30\text{ nm}$.
- valuation: Among the given options, $30\text{ nm}$ is the designated correct answer representing the approximate outer diameter of microtubules.
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