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)

Question

Responses

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.

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.

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

Answer 1

The correct response is:

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

In photosynthesis, energy from sunlight is used to convert carbon dioxide and water into glucose and oxygen, which requires significant energy input. Therefore, the activation energy for photosynthesis is higher compared to cellular respiration, which releases energy as glucose is broken down into carbon dioxide and water, thus having a lower activation energy.

Answer 2

How do enzymes affect chemical reactions?(1 point)
Responses

They eliminate activation energy.
They eliminate activation energy.

They lower activation energy.
They lower activation energy.

They increase activation energy.
They increase activation energy.

They provide activation energy.

Answer 3

The correct response is:

They lower activation energy.

Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to proceed. This makes it easier for the reaction to occur and increases the rate of the reaction without being consumed in the process.

Answer 4

Which lists the correct order of steps involved in the formation of an enzyme-substrate complex?(1 point)
Responses

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 > enzyme binds to substrate at active site > enzyme-substrate complex forms

enzyme binds to substrate at active site > enzyme-substrate complex forms > chemical reaction takes
enzyme binds to substrate at active site > enzyme-substrate complex forms > chemical reaction takes

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

Answer 5

The correct response is:

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

This sequence accurately represents the process in which the enzyme binds to the substrate, forming the enzyme-substrate complex, which then undergoes a chemical reaction to produce the final products that 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)
Responses

The body will use a different enzyme to catalyze the chemical reaction.
The body will use a different enzyme to catalyze the chemical reaction.

The cells of the digestive system will increase in temperature and catalyze the reaction.
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 chemical reaction will not occur, and the body will not be able to absorb the protein it needs.

The activation energy needed for the chemical reaction will be lowered.

Answer 7

The correct response is:

The chemical reaction will not occur, and the body will not be able to absorb the protein it needs.

If protease does not function properly, the breakdown of proteins into smaller molecules (amino acids) will be impaired, preventing the body from effectively absorbing and utilizing the proteins it requires for various biological functions.

Answer 8

How does temperature affect enzyme activity in a chemical reaction?(1 point)
Responses

The rate of a chemical reaction initially increases with increasing temperature and then decreases, eventually stopping, when the temperature gets too high.
The rate of a chemical reaction initially increases with increasing temperature and then decreases, eventually stopping, when the temperature gets too high.

The rate of a chemical reaction initially increases with decreasing temperature and then decreases, eventually stopping, when the temperature gets too low.
The rate of a chemical reaction initially increases with decreasing temperature and then decreases, eventually stopping, when the temperature gets too low.

The rate of a chemical reaction always decreases with increasing temperature and always increases with decreasing temperature.
The rate of a chemical reaction always decreases with increasing temperature and always increases with decreasing temperature.

The rate of a chemical reaction initially increases with increasing temperature and continues to increase indefinitely as temperature continues to increase.

Answer 9

The correct response is:

The rate of a chemical reaction initially increases with increasing temperature and then decreases, eventually stopping, when the temperature gets too high.

Enzyme activity generally increases with temperature up to a certain point, as the kinetic energy of the molecules increases, which leads to more frequent collisions between enzymes and substrates. However, if the temperature becomes too high, the enzyme may denature (lose its functional shape), leading to a decrease in reaction rate and eventually stopping the reaction altogether.