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Questions and Answers
What is the composition of myosin?
What is the composition of myosin?
- 2 heavy chains, 4 light chains, and 1 alpha helix
- 1 heavy chain, 2 light chains, and 2 alpha helixes
- 2 heavy chains, 2 light chains, and 2 alpha helixes (correct)
- 4 heavy chains, 2 light chains, and 2 alpha helixes
What is the role of the amino terminus of myosin?
What is the role of the amino terminus of myosin?
- Contains the domain for ATP hydrolyzation (correct)
- Connects to actin filaments
- Is responsible for muscle contraction
- Forms the tail of the protein
What forms the thick filaments in muscle cells?
What forms the thick filaments in muscle cells?
- Aggregation of actin molecules
- Aggregation of troponin molecules
- Aggregation of myosin molecules (correct)
- Aggregation of alpha helixes
What forms the thin filaments in muscle cells?
What forms the thin filaments in muscle cells?
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Study Notes
Myosin Composition
- Myosin is a hexameric protein composed of two heavy chains and four light chains.
Role of Amino Terminus
- The amino terminus of myosin is the head region, which binds to actin and has ATPase activity.
Thick Filaments
- Thick filaments in muscle cells are formed by the assembly of myosin molecules.
Thin Filaments
- Thin filaments in muscle cells are formed by the assembly of actin molecules.
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