Question 1

Question

A) 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)
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 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.
Question 2
A) How do enzymes affect chemical reactions? (1 point)
They eliminate activation energy.
They provide activation energy.
They lower activation energy.
They increase activation energy.
Question 3
A) Which lists the correct order of steps involved in the formation of an enzyme-substrate
complex? (1 point)
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
enzyme binds to substrate at active site > enzyme-substrate complex forms > chemical reaction
takes
chemical reaction takes place > products are released > enzyme binds to substrate at active site
> enzyme-substrate complex forms
Question 4
A) 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 body will use a different enzyme to catalyze the chemical reaction.
The chemical reaction will not occur, and the body will not be able to absorb the protein it needs.
The cells of the digestive system will increase in temperature and catalyze the reaction.  
The activation energy needed for the chemical reaction will be lowered.
Question 5
A) How does temperature affect enzyme activity in a chemical reaction? (1 point)
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.
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 increasing temperature and then
decreases, eventually stopping, when the temperature gets too high.

Answer 1

Here are the correct answers to your questions:

Question 1: Answer: Photosynthesis needs a higher amount of energy to activate the reaction because the products are at a lower energy state than the reactants.
Explanation: Photosynthesis is an endothermic process, meaning it requires energy (usually from sunlight) to boost the reaction, and its products have more energy than the reactants.

Question 2:
Answer: They lower activation energy.
Explanation: Enzymes act as catalysts to lower the activation energy needed for a reaction to proceed, thereby increasing the rate of the reaction.

Question 3:
Answer: enzyme binds to substrate at active site > enzyme-substrate complex forms > chemical reaction takes place > products are released.
Explanation: This is the correct sequence of events in the formation of an enzyme-substrate complex.

Question 4:
Answer: The chemical reaction will not occur, and the body will not be able to absorb the protein it needs.
Explanation: If protease does not function properly, it will fail to catalyze the breakdown of proteins, leading to issues with protein absorption.

Question 5:
Answer: The rate of a chemical reaction initially increases with increasing temperature and then decreases, eventually stopping, when the temperature gets too high.
Explanation: Enzyme activity typically increases with temperature up to an optimal point, after which high temperatures can denature the enzyme and reduce its activity.