2. all of the following are correct about enzymes except
(a) the mechanism by which enzymes work is known as lock and key
(b) they are proteins
(c) they denature at high temperatures
(d) they are assisted by vitamins and minerals
(e) enzymes are not normally degraded during a reaction
48 sat biology

The statement D 'they are assisted by vitamins and minerals' is incorrect.

Explanation:

Enzymes are biological catalysts which speed up a reaction. Their working mechanism is usually referred to as lock and key mechanisms as they make a lock and key type model while functioning. Each enzyme is specific for a specific kind of substrate. All enzymes are proteins. Enzymes itself are not degraded or get used up in a reaction. They might change from one form to another. But they are not assisted by vitamins or minerals, hence that statement is incorrect.

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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.