Biological Molecules and Enzymes Quiz
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At low temperatures enzyme activity declines because of:
A. Denaturation
B. Decreased Kinetic Motion
C. Increased H-Bonding
D. Dissociation of Ionic Compounds
The current model of enzyme action is referred to as the:
A. Induced Fit Model
B. Lock & Key Model
C. Singer-Nicolson Model
D. Davson-Danielli Model
What is this molecule called?
A. nucleotide
B. fatty acid
C. amino acid
D. monosaccharide
E. glycerol
What is the primary function of carbohydrates in living organisms?
A. Building cell walls
B. Transporting oxygen in the blood
C. Source of energy
D. Regulating body temperature
Which statement about enzymes is FALSE?
A. They are made from amino acids
B. They can be used multiple times
C. They lower the energy needed for reactions
D. A single enzyme has many different functions
The area that the substrate fits into on the enzyme is called the:
A. Active Site
B. Allosteric Site
C. DiSulphide Bridge
D. β-Pleated Sheet
Which component of the cell membrane is called hydrophilic?
A. phosphate head
B. lipid tail
C. cholesterol
D. proteins
How do enzymes speed up chemical reactions in the body?
A. By changing the pH of the body
B. By inhibiting the chemical reactions
C. By increasing the activation energy
D. By lowering the activation energy
A protein goes through ____ stages of folding before it is finished.
A. 4
B. 2
C. 3
D. 5
E. 20
Which of the following is found in plant cell walls?
A. Amylose
B. Cellulose
C. Amylopectin
D. Starch
E. Glycogen
Which describes the green and yellow bonds in the image?
A. Yellow is an alpha-1,4-glycosidic bond and green is a beta-1,4-glycosidic bond
B. Yellow is a beta-1,4-glycosidic bond and green is an alpha-1,4-glycosidic bond
C. Yellow is an alpha-1,4-glycosidic bond and green is an alpha-1,6-glycosidic bond
D. Yellow is an alpha-1,6-glycosidic bond and green is an alpha-1,4-glycosidic bond
E. Yellow is an beta-1,4-glycosidic bond and green is an alpha-1,6-glycosidic bond
Which colored box highlights the amino group?
A. Darker Blue (left)
B. Turquoise (top)
C. Orange (right)
D. Red (bottom)
E. Purple (middle)
What is competitive inhibition of enzymes?
A. It is when a molecule similar in structure to the substrate competes with the substrate for access to the active site of the enzyme, thereby inhibiting the enzyme’s activity.
B. It is when an enzyme and substrate do not interact at all
C. It is when an enzyme enhances the activity of a substrate
D. It is when an enzyme is completely deactivated by a substrate
What is the effect of temperature on enzyme activity?
A. Temperature has no effect on enzyme activity
B. Enzyme activity always decreases with temperature
C. Enzyme activity always increases with temperature
D. Temperature can either increase or decrease enzyme activity depending on the optimal temperature for the specific enzyme.
How does noncompetitive inhibition differ from competitive inhibition?
A. Noncompetitive inhibition occurs when the inhibitor binds to the active site of the enzyme.
B. Noncompetitive inhibition increases the rate of the enzyme-catalyzed reaction.
C. Noncompetitive inhibition does not affect the enzyme’s ability to bind to the substrate.
D. Noncompetitive inhibition does not compete with the substrate for the active site of the enzyme.