The power stroke of the myosin protein on an actin filament, Ask an Expert

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The power stroke of the myosin protein on an actin filament that generates tension in a muscle appears to be a 10 nm displacement generated by about a 1 pN force. Each power stroke is accompanied by the splitting of one ATP molecule which releases about 4.9 x 10^-20 J.

(a) How much work is done by one myosin in a single power stroke?
(b) What is the efficiency of the process; that is, what fraction of the ATP - generated energy does useful work?

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