Cytoskeleton
Easybiology
Microtubules are composed of which protein subunits?
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Solution
Incorrect! Answer:
Tubulin dimers
- Cytoskeleton: A network of protein fibers in the cytoplasm providing structural support and motility.
- Microtubules: These are the thickest fibers, hollow tubes with a diameter of about 25 nm.
- Composition: They are polymers made of globular protein subunits called tubulin. Each microtubule consists of tubulin dimers (each dimer has an α-tubulin and a β-tubulin polypeptide).
- Other Fibers:
- Microfilaments: Composed of actin monomers.
- Intermediate Filaments: Composed of various fibrous proteins like keratin.
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About This Question
- Subject
- biology
- Chapter
- cell structure and function
- Topic
- cytoskeleton
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Tubulin dimers
- Cytoskeleton: A network of protein fibers in the cytoplasm providing structural support and motility.
- Microtubules: These are the thickest fibers, hollow tubes with a diameter of about 25 nm.
- Composition: They are polymers made of globular protein subunits called tubulin. Each microtubule consists of tubulin dimers (each dimer has an α-tubulin and a β-tubulin polypeptide).
- Other Fibers:
- Microfilaments: Composed of actin monomers.
- Intermediate Filaments: Composed of various fibrous proteins like keratin.
This easy difficulty biology question is from the chapter cell structure and function, covering the topic of cytoskeleton. It appeared in the 2025 exam.
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