BIOMOLECULES AND ENZYMES

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BIOLOGY

ENZYMES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Reading Passage:Enzymes are biological catalysts, meaning that they are molecules capable of speeding up chemical reactions. They are large, protein-based compounds that bind to the reactants in a chemical reaction and, through one or more mechanisms, assist in the reaction without being changed at all themselves. Because chemical reactions are so diverse, the mechanisms by which enzymes speed up chemical reactions are also varied. However, one thing that enzymes have in common is that they are Catalysts that lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy. Question:How do enzymes speed up chemical reactions involved in the digestion of food?
A
Enzymes increase the pH of the reactants involved in the reactions.
B
Enzymes reduce the amount of energy the reactions must have in order to occur.
C
Enzymes reduce the number of atoms needed in the products of the reactions.
D
Enzymes provide heat energy that speeds up the molecules involved in the reactions.
Explanation: 

Detailed explanation-1: -An enzyme is a biological catalyst, a substance that increases the rate of a chemical reaction without being changed or consumed in the reaction.

Detailed explanation-2: -An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell. The enzyme is not destroyed during the reaction and is used over and over.

Detailed explanation-3: -A fundamental task of proteins is to act as enzymes-catalysts that increase the rate of virtually all the chemical reactions within cells.

Detailed explanation-4: -Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.

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