Microtubules of spindle fibres are composed of a protein called
Correct answer: A. Tubulin
- A. Tubulin
- B. Actin
- C. Myosin
- D. Troponin
Explanation
[A] The tubulin proteins α- and β polymerize into long chains or filaments that form microtubules.[B] Actin forms microfilaments in the cytoskeleton[C] Myosin protein is found in muscle cells, converts chemical energy in the form of ATP to mechanical energy,generating force and movement[D] Troponin,protein found in the muscles of heart
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Cytoplasmic Organelles
Cytoplasmic organelles are the specialized structures suspended in cytoplasm, including mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles and centrosomes. Questions compare their structures and functions in animal and plant cells, including chloroplasts and the role of the endomembrane system in transport and secretion.
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