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BIO 425 EXAM 2 QUESTIONS AND ANSWERS (100% PASS)
BIO 425 EXAM 2 QUESTIONS AND ANSWERS (100% PASS)
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©PREP4EXAMS@2024 [REAL EXAM DUMPS] Thursday, July 18, 2024 5:35 PMBIO 425 EXAM 2 QUESTIONS AND ANSWERS (100% PASS)
An enzyme:
a. is typically effective only in large amounts.
b. is a type of carbohydrate.
c. raises the activation energy of its reaction.
d. functions as a catalyst.
e. is permanently altered during the course of its reaction. - ✔️✔️functions as a catalyst.
Most enzymes are:
a. RNA molecules.
b. proteins.
c. carbohydrates.
d. lipids.
e. DNA molecules. - ✔️✔️proteins
A substrate binds to its enzyme at a location called the ______ site.
a. coenzyme
b. substrate
c. active
d. polypeptide
e. cofactor - ✔️✔️active
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,©PREP4EXAMS@2024 [REAL EXAM DUMPS] Thursday, July 18, 2024 5:35 PM
A negatively charged portion of a substrate molecule would most likely fit into a ______ region
of its enzyme's active site.
a. positively charged
b. negatively charged
c. hydrophilic
d. hydrophobic
e. polar - ✔️✔️positively charged
The general name for a nonprotein component required by some enzymes is a:
a. metal ion.
b. cofactor.
c. substrate.
d. prosthetic group.
e. coenzyme. - ✔️✔️cofactor
Most enzymes that catalyze phosphorylation reactions require ______ as a cofactor.
a. NAD+
b. Mg2+
c. Ca2+
d. AMP
e. an iron-sulfur cluster - ✔️✔️Mg2+
The vitamin niacin is part of the ______ molecule.
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,©PREP4EXAMS@2024 [REAL EXAM DUMPS] Thursday, July 18, 2024 5:35 PM
a. ferredoxin
b. iron-sulfur
c. pyridoxal phosphate
d. pyrophosphate
e. NAD+ - ✔️✔️NAD+
In a NAD+ molecule, a pyrophosphate bridge joins:
a. two nicotinamide molecules.
b. two adenine molecules.
c. one ribose molecule with one nicotinamide molecule.
d. two ribose molecules.
e. one ribose molecule with one adenine molecule. - ✔️✔️two ribose molecules
Which of the following statements about metabolic pathways is FALSE?
a. The enzymes of some pathways are segregated inside specific organelles.
b. The enzymes of some pathways are embedded in specific membranes.
c. The enzymes of most pathways allow intermediate products to accumulate.
d. Exergonic reactions in the pathway will pull forward preceding reactions.
e. The products from exergonic reactions will push along subsequent reactions. - ✔️✔️The
enzymes of most pathways allow intermediate products to accumulate.
Isozymes are:
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, ©PREP4EXAMS@2024 [REAL EXAM DUMPS] Thursday, July 18, 2024 5:35 PM
a. RNA molecules that catalyze metabolic reactions.
b. identical coenzymes that require different metal ions.
c. identical coenzymes located in different parts of the cell.
d. different enzymes that catalyze identical reactions.
e. identical enzymes that catalyze different reactions. - ✔️✔️different enzymes that catalyze
identical reactions.
As the temperature increases, the rate of an enzyme-catalyzed reaction usually:
a. increases constantly.
b. increases up to a point, then decreases.
c. decreases constantly.
d. decreases to a point, then increases.
e. increases, then decreases, then increases again. - ✔️✔️increases up to a point, decreases
Which of the following statements concerning the effect of pH on enzyme activity is FALSE?
a. Enzyme shape changes as the pH changes.
b. The pH affects positively-charged amino acids.
c. The pH affects negatively-charged amino acids.
d. The binding capacity of an enzyme is affected by pH.
e. Enzymes are always present at their pH optimum. - ✔️✔️Enzymes are always present at their
pH optimum.
Denaturation of an enzyme refers to the:
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