When a muscle fiber is relaxed, myosin cannot bind to actin because ____

a. ATP is not present
b. the myosin binding site on actin is blocked
c. the myosin head is in the wrong shape for binding
d. the actin is in the wrong orientation for myosin binding
e. the myosin head is 180 degrees from its attachment configuration


ANSWER: b

Biology & Microbiology

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