) Cellular respiration is an exothermic reaction and photosynthesis is an endothermic

Question

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.

Answer 1

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

Answer 2

) How do enzymes affect chemical reactions? (1 point)
They eliminate activation energy.
They provide activation energy.
They lower activation energy.
They increase activation energy.

Answer 3

They lower activation energy.

Answer 4

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

Answer 5

enzyme binds to substrate at active site > enzyme-substrate complex forms > chemical reaction takes place > products are released

Answer 6

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.