Biological Molecules and Enzymes Quiz
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Which colored box highlights the amino group?
A. Darker Blue (left)
B. Turquoise (top)
C. Orange (right)
D. Red (bottom)
E. Purple (middle)
What are the four main types of biological molecules found in living organisms?
A. Enzymes, hormones, antibodies, and ATP
B. Starch, cellulose, chitin, and glycogen
C. Fats, vitamins, minerals, and water
D. Carbohydrates, lipids, proteins, and nucleic acids
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
Which of the following is found in plant cell walls?
A. Amylose
B. Cellulose
C. Amylopectin
D. Starch
E. Glycogen
What is this molecule called?
A. nucleotide
B. fatty acid
C. amino acid
D. monosaccharide
E. glycerol
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
Describe the structure of a monosaccharide.
A. The structure of a monosaccharide is similar to a protein.
B. A monosaccharide has a structure of multiple sugar molecules.
C. The basic structure of a monosaccharide is a combination of sugar and fat.
D. A monosaccharide has a basic structure of a single sugar molecule.
Which component of the cell membrane is called hydrophilic?
A. phosphate head
B. lipid tail
C. cholesterol
D. proteins
Explain the difference between saturated and unsaturated fats.
A. Saturated fats have more double bonds than unsaturated fats.
B. Saturated fats are healthier than unsaturated fats.
C. Saturated fats have no double bonds between the carbon atoms, while unsaturated fats have at least one double bond between the carbon atoms.
D. Unsaturated fats are solid at room temperature, while saturated fats are liquid.
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
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.
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
What does this image most closely resemble?
A. Starch
B. Cellulose
C. Glycogen
What do starch and glycogen have in common?
A. Alternate glucose molecules are flipped
B. Presence of both 1,4- and 1,6-glycosidic bonds
C. Helical and unbranched
D. Linear and branched
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
What are the main functions of lipids in the human body?
A. Regulation of body temperature
B. Production of antibodies
C. Energy storage, structural components of cell membranes, absorption of fat-soluble vitamins
D. Transport of oxygen in the blood
Which polysaccharide does the image show?
A. Starch
B. Cellulose
C. Glycogen
Explain the role of enzymes in biological processes.
A. Enzymes inhibit chemical reactions by increasing activation energy.
B. Enzymes have no role in biological processes.
C. Enzymes speed up chemical reactions by lowering activation energy.
D. Enzymes are only involved in physical processes, not chemical reactions.
At low temperatures enzyme activity declines because of:
A. Denaturation
B. Decreased Kinetic Motion
C. Increased H-Bonding
D. Dissociation of Ionic Compounds
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
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.
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
A protein goes through ____ stages of folding before it is finished.
A. 4
B. 2
C. 3
D. 5
E. 20
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