The enzyme lactase will affect the breakdown of the carbohydrate lactose, but not the carbohydrate starch. The ability of an enzyme to interact with only specific molecules is most
directly determined by the-

A) speed of the reaction
B) structure of the active site
C) number of molecules involved
D) temperature of the solution

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answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.