Life Science Review For Semester 1 Final: Enzymes And Energy (With Answers)
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- 1.What does a catalyst do to a reaction?
- A.
Force it to happen
- B.
Speed it up
- C.
Prevent it from happening
- D.
All of the above
- E.
None of the above
- 2.NWhat do we call biological catalysts?
- A.
Inhibitors
- B.
Metabolism
- C.
Enzymes
- D.
All of the above
- E.
None of the above
- 3.Enzymes are what type of biological molecule?
- A.
Protein
- B.
Lipid
- C.
Nucleic acid
- D.
All of the above
- E.
None of the above
- 4.What is the function of an enzyme?
- A.
Make a chemical reaction happen
- B.
Speed up a chemical reaction
- C.
Carry oxygen in blood
- D.
All of the above
- E.
None of the above
- 5.What is the activation energy for a chemical reaction?
- A.
The amount of energy generated by the reaction
- B.
The amount of energy required to get the reaction started
- C.
The amount of energy required to stop the reaction
- D.
All of the above
- E.
None of the above
- 6.What does an enzyme do to the activation energy of a chemical reaction?
- A.
Increase it
- B.
Decrease it
- C.
Nothing
- D.
All of the above
- E.
None of the above
- 7.What do we call the starting materials for a chemical reaction?
- A.
Reactants
- B.
Products
- C.
Catalysts
- D.
All of the above
- E.
None of the above
- 8.What do we call the materials which are made in a chemical reaction?
- A.
Reactants
- B.
Products
- C.
Catalysts
- D.
All of the above
- E.
None of the above
- 9.Is an enzyme used up during a chemical reaction?
- A.
Yes
- B.
No
- C.
It depends on the reaction
- D.
It depends on if there is an inhibitor present
- E.
None of the above
- 10.What happens in a hydrolysis reaction?
- A.
Water is split
- B.
Water is used to split another molecule
- C.
An enzyme is prevented from catalyzing a reaction
- D.
All of the above
- E.
None of the above
- 11.What do we call the part of the enzyme which binds the substrate?
- A.
Active site
- B.
Allosteric site
- C.
Catalyst
- D.
All of the above
- E.
None of the above
- 12.What is special about the shape of an enzyme's active site?
- A.
It is very small
- B.
It can be denatured using high temperatures
- C.
It fits the substrate shape exactly
- D.
All of the above
- E.
None of the above
- 13.What do we call the reactants in a chemical reaction when an enzyme is used to speed up the reaction?
- A.
Reactants
- B.
Substrates
- C.
Inhibitors
- D.
All of the above
- E.
None of the above
- 14.Where does a substrate bind an enzyme?
- A.
Allosteric site
- B.
Inhibitor site
- C.
Active site
- D.
All of the above
- E.
None of the above
- 15.Can an enzyme have more than one substrate?
- A.
Yes, but the substrates must be similar in shape
- B.
Yes, an enzyme can bind two molecules at once during a synthesis reaction
- C.
Yes, some enzymes can change the shape of their active site to fit several substrates
- D.
All of the above
- E.
None of the above
- 16.Which model of enzyme activity states that an enzyme's active site has a shape which matches the substrate site very precisely?
- A.
Lock and key model
- B.
Induced fit model
- C.
Catalyst model
- D.
All of the above
- E.
None of the above
- 17.Which model of enzyme activity states that an enzyme's active site will change shape slightly to fit one or more substrates when they bind?
- A.
Lock and key model
- B.
Induced fit model
- C.
Catalyst model
- D.
All of the above
- E.
None of the above
- 18.What do we call a molecule that binds to an enzyme and prevents the enzyme from catalyzing a reaction?
- A.
Reactant
- B.
Inhibitor
- C.
Active site
- D.
All of the above
- E.
None of the above
- 19.YmAll of the energy on Earth comes from what source?
- A.
Sun
- B.
Chloroplasts
- C.
Chemical reactions
- D.
All of the above
- E.
None of the above
- 20.What organelle present in plants converts light energy into chemical energy?
- A.
Mitochondrion
- B.
Chloroplast
- C.
Ribosome
- D.
All of the above
- E.
None of the above
- 21.Which of the following substances is a reactant for photosynthesis?
- A.
Carbon dioxide
- B.
Oxygen
- C.
Sugar
- D.
All of the above
- E.
None of the above
- 22.Which of the following substances is a reactant for photosynthesis?
- A.
Water
- B.
Carbon dioxide
- C.
Light
- D.
All of the above
- E.
None of the above
- 23.Which of the following substances is a product of photosynthesis?
- A.
Water
- B.
Carbon dioxide
- C.
Light
- D.
All of the above
- E.
None of the above
- 24.Which of the following substances is a product of photosynthesis?
- A.
Water
- B.
Carbon dioxide
- C.
Oxygen
- D.
All of the above
- E.
None of the above
- 25.Which of the following substances is a product of photosynthesis?
- A.
ATP
- B.
Sugar
- C.
Oxygen
- D.
All of the above
- E.
None of the above
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