Thick filaments are composed of which protein?

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Study for the IMAT Biology Exam with focused multiple-choice questions. Use hints and explanations to enhance your preparation. Get ready for your exam success!

Multiple Choice

Thick filaments are composed of which protein?

Explanation:
Thick filaments in muscle fibers are made primarily of myosin. Myosin molecules have a long tail that bundles together to form the filament and two globular heads that protrude outward to form cross-bridges with the actin in the thin filaments. When ATP is hydrolyzed, these heads pull on actin, powering muscle contraction. In contrast, actin builds the thin filaments, tropomyosin sits along actin as a regulatory component, and titin provides elasticity and helps anchor the thick filaments in place.

Thick filaments in muscle fibers are made primarily of myosin. Myosin molecules have a long tail that bundles together to form the filament and two globular heads that protrude outward to form cross-bridges with the actin in the thin filaments. When ATP is hydrolyzed, these heads pull on actin, powering muscle contraction. In contrast, actin builds the thin filaments, tropomyosin sits along actin as a regulatory component, and titin provides elasticity and helps anchor the thick filaments in place.

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