<span>homologous structures..</span>
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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Because Spain held such a dominant presence in the America's, Portugal focused on Africa. The correct option among all the options given in the question is option "A". The Spanish empire back then was one of the largest empire among all the empires. They were the masters of exploring the world via sea route and so they had created colonies far before the other. In America the Spanish were already present and expanding when Portugal decided to look elsewhere for creating colonies.
