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Cellular respiration is an exothermic reaction and photosynthesis is an endothermic reaction. How does the required activation energy compare for these two reactions?(1 point)

Responses

Cellular respiration needs a higher amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
Cellular respiration needs a higher amount of energy to activate the reaction because the products are at a lower energy state than the reactants.

Photosynthesis needs a smaller amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
Photosynthesis needs a smaller amount of energy to activate the reaction because the products are at a lower energy state than the reactants.

Photosynthesis needs a higher amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
Photosynthesis needs a higher amount of energy to activate the reaction because the products are at a lower energy state than the reactants.

Cellular respiration needs a smaller amount of energy to activate the reaction because the products are at a lower energy state than the reactants.

Cellular respiration needs a smaller amount of energy to activate the reaction because the products are at a lower energy state than the reactants.

How do enzymes affect chemical reactions?(1 point)

Responses

They provide activation energy.
They provide activation energy.

They eliminate activation energy.
They eliminate activation energy.

They increase activation energy.
They increase activation energy.

They lower activation energy.

They lower activation energy.

Cellular respiration is an exothermic reaction and photosynthesis is an endothermic reaction. How does the required activation energy compare for these two reactions? (1 point)

For cellular respiration, which is an exothermic reaction, the required activation energy is typically lower. This is because the products are in a lower energy state than the reactants, meaning less energy is needed to start the reaction.

On the other hand, for photosynthesis, which is an endothermic reaction, the required activation energy is typically higher. The products are in a higher energy state than the reactants, so more energy is needed to initiate the reaction and convert the reactants to the higher energy products.

How do enzymes affect chemical reactions?

Enzymes, which are biological catalysts, affect chemical reactions by lowering the activation energy required for the reaction to occur. They do this by facilitating the formation of the transition state, a high-energy intermediate that leads to the formation of the products. Specifically, enzymes bind to the reactant molecules, called substrates, and orient them in such a way that they can react more easily and quickly. This reduces the energy barrier that needs to be overcome for the reaction to proceed, making it more likely to occur at a faster rate. Enzymes do not provide activation energy or eliminate it; rather, they lower the amount of activation energy needed for a reaction to take place.