BIOLOGY
ENZYMES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They are biosubstrates that speed up chemical reactions.
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They are biosubstrates that decrease chemical reactions.
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They are biocatalysts that decrease the activation energy in chemical reactions.
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They are biocatalysts that increase and decrease the activationenergy in chemical reactions.
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Detailed explanation-1: -Enzymes (and other catalysts) act by reducing the activation energy, thereby increasing the rate of reaction.
Detailed explanation-2: -Enzymes generally lower activation energy by reducing the energy needed for reactants to come together and react. For example: Enzymes bring reactants together so they don’t have to expend energy moving about until they collide at random.
Detailed explanation-3: -A catalyst (KAT-l-ihst) is a substance that decreases the activation energy needed to start a chemical reac-tion. As a result, a catalyst also increases the rate of the chemical reaction, or makes the products form faster. A catalyst takes part in a chemical reaction, but it does not get changed or used up.
Detailed explanation-4: -What Do Enzymes Do? Enzymes are protein catalysts that speed biochemical reactions by facilitating the molecular rearrangements that support cell function. Recall that chemical reactions convert substrates into products, often by attaching chemical groups to or breaking off chemical groups from the substrates.
Detailed explanation-5: -Enzymes in our bodies are catalysts that speed up reactions by helping to lower the activation energy needed to start a reaction. Each enzyme molecule has a special place called the active site where another molecule, called the substrate, fits.