The answer to this question is "fluid mosaic model". We are being asked the question above and the complete sentence is below:
The contemporary description of the membrane structure of a cell is commonly known as the FLUID MOSAIC MODEL.
It is the Watt per square meter, or W/m2.
Different enzymes have specific active sites which can only catalyze one <span>substrate. Enzyme-substrate complexes are produced only when the substrate fits into the active site :)</span>
I would say it's A because it sounds like the most important one.