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Troponin C bind with...

Troponin C bind with

A

Actin

B

Calcium

C

Tropomysin

D

Myosin

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Troponin C**: Troponin C is a protein that plays a crucial role in muscle contraction. It is part of the troponin complex found in skeletal and cardiac muscle. 2. **Analyzing the Options**: - **Option 1: Actin**: Troponin C does not bind to actin directly. Actin is a protein that forms the thin filaments in muscle fibers, but Troponin C does not interact with it. - **Option 2: Calcium**: This is the correct answer. Troponin C binds to calcium ions. When calcium binds to Troponin C, it causes a conformational change that allows muscle contraction to occur. - **Option 3: Tropomycin**: Troponin C does not bind to tropomycin. Tropomycin is another protein that binds to actin and regulates the interaction between actin and myosin. - **Option 4: Myosin**: Troponin C does not bind to myosin. Myosin is a motor protein that interacts with actin to facilitate muscle contraction, but it is not the binding partner for Troponin C. 3. **Conclusion**: Based on the analysis, Troponin C specifically binds with calcium ions, which is essential for muscle contraction in vertebrates. ### Final Answer: Troponin C binds with Calcium. ---
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