For each of the following statements indicate if the statement is true or false. If it is false, explain why.
a) T or F Exergonic reactions always give off heat.
b) T or F Enzymes reduce the amount of energy released by an exergonic reaction.
c) T or F Enzymes are highly specific catalysts and will act only on a single kind of molecule.
d) T or F Entropy always increases.
e) T or F When ADP is converted to ATP, energy is given off in a form the cell can use to drive endergonic reactions.
f) T or F Coenzymes participate in reaction performed by enzymes, being chemically modified in the process. They are then rapidly recycled.
For each of the following statements indicate if the statement is true or false. If it is false, explain why.
a) T or F Exergonic reactions always give off heat.
b) T or F Enzymes reduce the amount of energy released by an exergonic reaction.
c) T or F Enzymes are highly specific catalysts and will act only on a single kind of molecule.
d) T or F Entropy always increases.
e) T or F When ADP is converted to ATP, energy is given off in a form the cell can use to drive endergonic reactions.
f) T or F Coenzymes participate in reaction performed by enzymes, being chemically modified in the process. They are then rapidly recycled.
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QUESTION 1
An example of an endergonic reaction is
A. | Polymerizing a protein from amino acids. | |
B. | Breaking a protein down into amino acids. | |
C. | Breaking down ATP into ADP and P. | |
D. | Breaking down glucose (using oxygen) to make CO2 and H2O. |
QUESTION 2
When ATP breaks down to supply energy for cellular reactions, it often transfers its 3rd phosphate to another molecule. This is called ______, and makes the other molecule _______ reactive.
A. | catalysis . . . more | |
B. | phosphorylation . . . more | |
C. | phosphorylation . . . less | |
D. | polymerization . . . less |
QUESTION 3
Which is true of enzymes?
A. | They are highly specific in the reactions they catalyze. | |
B. | Chemically, most are carbohydrates. | |
C. | They accelerate reactions by adding energy. | |
D. | They break down and are used up as they catalyze reactions. |
QUESTION 4
What is peristalsis?
A. | Rings of muscle that can contract to close off the stomach at each end. | |
B. | A gland that secretes saliva. | |
C. | Coordinated muscle contractions that move the contents of the GI tract. | |
D. | A stomach enzyme that breaks down proteins. |
QUESTION 5
Which is not a component of gastric juice?
A. | H2O | |
B. | acid | |
C. | pepsin | |
D. | amylase | |
QUESTION 6
What does the enzyme pepsin do?
A. | Completely breaks down proteins into individual amino acids. | |
B. | Completely breaks down carbohydrates into monosaccharides. | |
C. | Partially breaks down proteins into smaller polypeptides. | |
D. | Partially breaks down fats into fatty acids. |