AP BIOLOGY

Detailed explanation-1: -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-2: -The answer is enzymes. Enzymes in our bodies are catalysts that speed up reactions by helping to lower the activation energy needed to start a reaction.

Detailed explanation-3: -A catalyst is something that lowers the activation energy; in biology it is an enzyme. The catalyst speeds up the rate of reaction without being consumed; it does not change the initial reactants or the end products.

Detailed explanation-4: -Enzymes are protein catalysts that speed biochemical reactions by facilitating the molecular rearrangements that support cell function.

Detailed explanation-5: -Ans. The correct answer is option ‘a’ catalysts increase the rate of the reaction by reducing the free energy of the transition state, which lowers the activation energy.