You have designed a drug that is supposed to bind to the myosin binding sites on actin. You inject it into a relaxed muscle, but find that none of the drug bound. Which of the following explains why?
A. Troponin molecules are covering myosin binding sites on actin.
B. The myosin binding sites on actin are covered by tropomyosin.
C. The myosin binding sites are covered by ATP.
D. There are no myosin binding sites on actin.
E. None of the choices are correct.
Answer: B
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