) 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)
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 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.
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.
) How do enzymes affect chemical reactions? (1 point)
They eliminate activation energy.
They provide activation energy.
They lower activation energy.
They increase activation energy.
They lower activation energy.
Which lists the correct order of steps involved in the formation of an enzyme-substrate
complex? (1 point)
enzyme binds to substrate at active site > enzyme-substrate complex forms > chemical reaction
takes
enzyme binds to substrate at active site > chemical reaction takes place > products are released
> enzyme-substrate complex forms
chemical reaction takes place > products are released > enzyme binds to substrate at active site
> enzyme-substrate complex forms
enzyme-substrate complex forms > enzyme binds to substrate at active site > chemical reaction
takes place > products are released
enzyme binds to substrate at active site > enzyme-substrate complex forms > chemical reaction takes place > products are released
Protease is an enzyme in the human body that catalyzes a chemical reaction in which
proteins are broken down into smaller molecules so that the body can use them. Which is a
likely outcome if protease does not function properly? (1 point)
The cells of the digestive system will increase in temperature and catalyze the reaction.
The chemical reaction will not occur, and the body will not be able to absorb the protein it needs.
The body will use a different enzyme to catalyze the chemical reaction.
The activation energy needed for the chemical reaction will be lowered.
To determine how the required activation energy compares for cellular respiration and photosynthesis, we need to understand the concept of activation energy for chemical reactions. Activation energy is the energy required to initiate a chemical reaction by breaking the bonds of the reactant molecules.
In the given options, two statements mention that the products are at a lower energy state than the reactants. Let's evaluate both options:
1) Photosynthesis needs a higher amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
According to this statement, photosynthesis requires a higher activation energy because the energy difference between the reactants and products is large. However, this statement is incorrect because photosynthesis is an endothermic reaction, which means it requires an input of energy (light energy) to proceed. Therefore, the activation energy for photosynthesis would be relatively lower as the input energy helps overcome the activation barrier.
2) Cellular respiration needs a higher amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
This statement suggests that cellular respiration requires a higher activation energy due to the energy difference between reactants and products. However, cellular respiration is an exothermic reaction, which means it releases energy. Therefore, this statement is also incorrect.
Based on the above analysis, neither option in the given choices accurately explains the comparison of activation energy for cellular respiration and photosynthesis. So, none of the options are correct.