Energy and Enzymes Practice Test

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

____ 1. The second law of thermodynamics holds that

a.	matter can be neither created nor destroyed.
b.	energy can be neither created nor destroyed.
c.	energy of one form is converted to a less concentrated form whenever energy is transformed or transferred.
d.	entropy decreases with time.
e.	none of these

____ 2. Essentially, the first law of thermodynamics says that

a.	one form of energy cannot be converted into another.
b.	entropy is increasing in the universe.
c.	energy can be neither created nor destroyed.
d.	energy cannot be converted into matter or matter into energy.
e.	all of these

____ 3. Endergonic reactions

a.	have more energy in the reactants than in the products.
b.	have more energy in the products than in the reactants.
c.	are illustrated by the breakdown of glucose.
d.	are the mechanisms used by animals to provide energy for biological reactions.
e.	have more energy in the products than in the reactants and are illustrated by the breakdown of glucose.

____ 4. ATP contains

a.	adenine.
b.	cytosine.
c.	uracil.
d.	thymine.
e.	guanine.

____ 5. Enzymes

a.	are very specific.
b.	act as catalysts.
c.	are organic molecules.
d.	have special shapes that control their activities.
e.	all of these

____ 6. Activation energy

a.	is less when enzymes are present.
b.	allows greater interaction of substrate with the active site.
c.	is needed to begin a reaction.
d.	is less when enzymes are present and is needed to begin a reaction.
e.	is less when enzymes are present, allows greater interaction of substrate with the active site, and is needed to begin a reaction.

____ 7. Enzymes may be controlled by

a.	temperature.
b.	the presence of chemicals that fit into allosteric sites.
c.	feedback inhibition.
d.	current metabolic conditions in the cell.
e.	all of these

Short Answer

Photosynthesis Stages

Items a-c below are processes that occur during different stages of photosynthesis. Answer the following questions by selecting one of these three processes.

a. oxidation

b. reduction

c. phosphorylation

8. Refer to Photosynthesis Stages. When an electron transport molecule, such as ferrodoxin, gives up an electron, this process occurs to the ferrodoxin.

Energy and Enzymes Practice Test

Answer Section

MULTIPLE CHOICE

1. ANS: C

2. ANS: C

3. ANS: B

4. ANS: A

5. ANS: E

6. ANS: E

7. ANS: E

SHORT ANSWER

8. ANS: