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Multiple Choice
Which of the following proteins are found in a thin filament?
A
Titin
B
Myosin
C
Actin
D
Nebulin
Verified step by step guidance
1
Understand the structure of a muscle fiber: Muscle fibers contain myofibrils, which are composed of repeating units called sarcomeres. Sarcomeres are the functional units of muscle contraction.
Identify the components of a sarcomere: Sarcomeres consist of thick and thin filaments. Thick filaments are primarily composed of the protein myosin, while thin filaments are primarily composed of the protein actin.
Recognize the proteins associated with thin filaments: Thin filaments are primarily made of actin, but they also contain other proteins such as tropomyosin and troponin, which play roles in muscle contraction regulation.
Differentiate between the proteins listed: Titin is a protein that contributes to the elasticity and stability of the sarcomere, but it is not part of the thin filament. Myosin is the main component of thick filaments. Nebulin is associated with thin filaments and helps stabilize actin filaments.
Conclude which protein is found in thin filaments: Based on the structure and composition of sarcomeres, actin is the primary protein found in thin filaments, along with nebulin, which helps organize the actin filaments.