A chain of small units of globular actin make up Blank______.Multiple choice question.tropomyosinF actintroponinmyosin

Break Down the Problem

1. Identify the key components of the question, which are actin and the options provided: tropomyosin, F actin, troponin, myosin.
2. Recall the functions and formations of each component in muscle fibers.

Relevant Concepts

1. Actin: A globular protein that polymerizes to form long filamentous chains known as F actin (filamentous actin).
2. Tropomyosin: A protein that binds along the grooves of actin filaments, regulating muscle contraction.
3. Troponin: A complex of proteins that work with tropomyosin to regulate muscle contraction.
4. Myosin: A motor protein that interacts with actin during muscle contraction but is not composed of actin units.

Analysis and Detail

• The question specifically asks about the structure made up of small units of globular actin.
• Tropomyosin and troponin are regulatory proteins associated with actin, while myosin is a motor protein that interacts with actin.
• F actin refers specifically to the filamentous form of actin formed from its globular monomers.

Verify and Summarize

• The only option that directly refers to the polymerized form of actin is "F actin."
• Hence, the correct answer involves identifying that small units of globular actin polymerize to form this structure.

Final Answer

F actin is the correct choice as it is the filamentous form made up of small units of globular actin.