The answer is D.They reproduce independently. It is false because they need a host and can't survive by themselves.
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The myosin head separates from actin as a result of ATP binding. The intrinsic ATPase activity of myosin then transforms ATP into ADP and Pi. The myosin head's angle is altered into a cocked state by the energy generated during ATP hydrolysis. The myosin head is now ready to move in the future.
The myosin protein is in a high-energy conformation when the head is cocked. At the end of the power stroke, the myosin head is in a low-energy position because this energy has been used up during the power stroke. ADP is released following the power stroke, but the cross-bridge is still there and actin and myosin are joined together.
Since ATP is readily available, the cross-bridge cycle can repeat, and muscular contraction can go on as long as ATP is there.
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It becomes inactive in the stomach because of the stomach having a MUCH greater PH level then the mouth. It is typically 1.0-2.0 in the Stomach which is extremely acidic which causes it to change shape and therefore inactive.
They do that so when a shark eats something and crumbs come out of its mouth it eats the crumbs
