Question

1- Chemical bonds are broken and reformed in all chemical reactions. A reaction that results in the release of energy is referred to as

Select one:

a. Exergonic

b. Dangerous

c. Endergonic

d. Activation

e. Photosynthesis

2- In lab, catalase will be used to initiate a particular chemical reaction that breaks hydrogen peroxide down into water and oxygen gas. Which is the substrate in this reaction?

Select one:

a. Hydrogen

b. Catalase

c. Hydrogen peroxide

d. Water

e. Oxygen gas

3- The initial input of energy required to initiate any chemical reaction is called?

Select one:

a. Oxidation energy

b. Activation energy

c. Kinetic energy

d. Active site energy

e. Reduction energy

4- The part of an enzyme that a substrate recognizes and eventually binds to is called

Select one:

a. Cofactor

b. Active site

c. Pyruvate

d. Isomer

e. none of these

5- The synthesis of high energy glucose molecules from low energy molecules, carbon dioxide and water, requires a large input of solar energy and illustrates which type of reaction?

Select one:

a. Endergonic

b. Hypotonic

c. Hypertonic

d. Exergonic

e. none of these

6- True or false, the same enzyme can function in a wide range of conditions like temperature and pH.

Select one:

a. True

b. False

7- What are enzymes?

Select one:

a. Very specific biological catalysts

b. Molecules that lower the activation energy of chemical reactions in cells

c. Molecules that are not used up in a chemical reaction, can be reused

d. Most are proteins

e. All of the above

Question 8

What determines the function of an enzyme?

Select one:

a. Its unique three-dimensional structure

b. How heavy it is

c. What organism it came from

d. How old it is

e. None of these

Question 9

What is it called when a poison blocks the action of an enzyme on its substrate?

Select one:

a. Modality

b. Augmentation

c. Bonding

d. Upsetting

e. Competitive inhibition

Question 10

What is metabolism?

Select one:

a. Breakdown of substances to yield energy

b. Chemical processes within living cell or organism necessary for maintenance of life

c. Sum of all chemical reactions in a cell

d. All of the above

11- What would you predict would be the optimal temperature of most enzymes that occur in humans?

Select one:

a. 45 degrees Fahrenheit

b. 32 degrees Fahrenheit

c. 58 degrees Fahrenheit

d. 73 degrees Fahrenheit

e. 98 degrees Fahrenheit

12- When you cook an egg the protein in the white of the egg changes appearance from a clear liquid to a white solid. What has happened to the egg protein?

Select one:

a. It is denatured

b. The shape of the protein is altered

c. Nothing, you can not affect an enzyme by heating it

d. Both A and B

13- Where is energy stored in living organisms?

Select one:

a. In blood

b. In the chemical bonds of biological molecules

c. In nerve tissue

d. Energy can not be stored

14- Which molecule is considered the most common short-term energy carrier molecule of cells?

Select one:

a. Catalase

b. Oxygen

c. ATP (Adenosine Triphosphate)

d. Enzymes

e. Starch

15-

Which of the following is true according to the 1st and 2nd law of thermodynamics?

Select one:

a. Energy conversions are 100% efficient

b. The potential energy of the final state will always be more than the potential energy of the initial state

c. The energy available to do useful work is less after energy is transformed

d. Energy can be created

e. Energy can be destroyed

16-

Which of the following statements about energy is false?

Select one:

a. Is the capacity to do work

b. Is stored in the bonds of molecules

c. Can be transformed

d. Is necessary for life

e. Can be created

17-

Why do many people develop intolerance to lactose (milk sugar) as they get older?

Select one:

a. They are worn out from digesting milk products all their lives

b. They no longer synthesize the enzyme that breaks down lactose

c. They lose their taste for milk products

d. A, B and C are all true

e. No one is intolerant to lactose- it is an urban myth

Answer 1

1)- option a is correct because in exergonic reaction energy is released.

2)- option c is correct because the hydrogen peroxide is substrate.

3)- option b is correct because activation energy help to speed up the reaction.

4)- option b is correct because substrate bind to the active site.

5)- option c is correct because in this process energy is released.

7)- option e is correct because enzymes are protein and act as catalyst.

9)- option e is correct because it act as inhibitor.

10)- option d is correct because in it substances are broken down and provide energy.

11)- option e is correct because 98 degree ferenheit equal to 37degree Celsius.

12)- option a is correct because it is disrupted.

13)- option d is correct because energy is not stored, compounds are stored which provide energy.

15)- option a is correct because energy is transformed from one form to another.

16)- option e is correct because energy can't be created nor be destroyed.

17)- option b is correct because enzyme lactase is important for break down of lactose.