BIOLOGY
ENZYMES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They speed up chemical reactions in cells.
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They lower the activation energy needed for some reactions.
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They regulate the absorption of energy in chemical reactions.
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All the other answers are correct.
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Detailed explanation-1: -Enzymes are proteins that help speed up metabolism, or the chemical reactions in our bodies. They build some substances and break others down.
Detailed explanation-2: -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.
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. Although RNAs are capable of catalyzing some reactions, most biological reactions are catalyzed by proteins.
Detailed explanation-4: -Definition. 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.
Detailed explanation-5: -The enzyme speeds up the reaction by lowering the activation energy needed for the reaction to start. Compare the activation energy with and without the enzyme. Enzymes generally lower activation energy by reducing the energy needed for reactants to come together and react.