An embolus is anything which travels through the blood vessels until it reaches a vessel that is too small to let it pass through, and this causes the blood flow to stop. Basically, a thrombus is the blood clot itself, and the embolus is a fraction of the blood clot which travels through the blood vessels.
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B) The enzyme has active sites where the substrate binds with the enzyme to form a complex. When the substrate binds to the active site, an induced fit is formed where the enzyme changes its shape in order to better serve the substrate and lower the activation energy of the reaction