Question

which of the following is true about enzymes?enzymes increase the temperature of a chemical reactionenzymes raise the activation energy of a chemical reactionenzymes lower the activation energy of a chemical reaction enzymes leave the activation energy of a chemical reaction unchangedenzymes decrease the rate of a chemical reaction

Answer 1

Answer: The correct answer is enzymes lower the activation energy of a chemical reaction.

Step-by-step explanation:

• Enzymes are protein molecules that act as catalysts in biological systems. They speed up chemical reactions by lowering the activation energy required for the reaction to occur.
• Activation energy is the energy needed to initiate a chemical reaction, and enzymes facilitate this process by providing an alternative reaction pathway with a lower activation energy.
• Enzymes achieve this by binding to the reactant molecules, called substrates, and bringing them into close proximity, which enhances the chances of successful collisions and formation of the reaction products.
• By lowering the activation energy, enzymes accelerate the rate at which a chemical reaction reaches its equilibrium and allow biological processes to occur at a faster rate than they would without the presence of enzymes.

Answer 2

Enzymes lower the activation energy of chemical reactions, facilitating biochemistry by providing an alternate pathway for the reaction and optimally orienting substrates. They are sensitive to temperature and work within specific ranges, but they do not raise the temperature or activation energy, nor do they decrease the rate of reactions.

Step-by-step explanation:

The true statement about enzymes from the options given is that enzymes lower the activation energy of a chemical reaction. Enzymes are biological catalysts that accelerate chemical reactions by reducing the energy barrier, known as activation energy, that must be overcome for the reactions to proceed. They do this by providing an alternate reaction pathway and by binding to reactants, also known as substrates, in a way that facilitates the chemical transformation.

Enzymes are sensitive to temperature, pH, and ionic conditions, and they function optimally within specific ranges of these parameters. Generally, an increase in temperature can increase the rate of a chemical reaction, but if the temperature is too high or too low, it can affect enzyme activity negatively, potentially leading to denaturation and loss of catalytic function. Enzymes do not affect the overall temperature of the reaction, nor do they raise the activation energy or decrease the rate of a chemical reaction. Instead, they increase the rate of reaction by lowering the activation energy needed.