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which of the following is true of a troponin molecule? a) it blocks the myosin binding...

which of the following is true of a troponin molecule?

a) it blocks the myosin binding sites.

b) it makes up the thin myofilament.

c) it is elastic and helps position myosin.

d) it has a receptor that binds calcium ions.

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Answer #1

Which of the following is true of a troponin molecule?

Answer: d) It has a receptor that binds calcium ions.

Explanation: Troponin is a regulatory protein of skeletal muscle fibers that binds with calcium ions and regulates the action of calcium ions on tropomyosin protein molecule. It is made up of there protein subunits :- troponin T which binds to tropomyosin; troponin I which inhibits myosin-actin interaction; troponin C which binds with calcium and brings about contraction by removing the effect of tropomyosin.

Myosin binding sites present on actin molecules are blocked by tropomyosin and not troponin.

Thin myofilament is mainly composed of the contractile protein called actin.

Elasticity of the muscle is due to a protein called titin.

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