BIO 203 EXAM 2- TEST 2025/2026
QUESTIONS AND ANSWERS 100% PASS
Which of the following is true for catabolic pathways?
A) they are usually non-spontaneous chemical reactions
B) they consume energy to build up polymers from monomers
C) they release energy as they degrade polymers to monomers
D) they represent endergonic reactions
E) none of the above - ANS C) they release energy as they degrade polymers to monomers
Enzymes speed up metabolic reactions by
A) increasing the activation energy barrier
B) being consumed during the reaction
C) creating more substrate
D) increasing the temperature of the surroundings
E) none of the above - ANS E) none of the above
ATP has the following properties
A) composed of high energy phosphoanhydride bonds
B) can couple with endergonic reactions to produce exergonic reactions
C) can power chemical work in the cell
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, D) can power transport work in the cell
E) all of the above - ANS E) all of the above
The following mechanisms of endocytosis are utilized by cells:
A) receptor-mediated endocytosis
B) cotransport
C) electrogenic pump
D) chemiosmosis
E) none of the above - ANS A) receptor-mediated endocytosis
Which of the following molecules would likely move directly through the lipid bilayer of a
plasma membrane?
A) glucose
B) Ca++
C) O2
D) Na++
E) all of the above - ANS C) O2
The presence of cholesterol in the plasma membranes of some animals
A) reduces membrane fluidity at moderate (37C) temperatures
B) enables the animal to add hydrogen atoms to unsaturated phospholipids
C) makes the membrane less flexible, allowing it to sustain greater pressure from within the
cell
D) is not necessary for membrane function
E) enables the animal to remove hydrogen atoms from saturated phospholipids - ANS A)
reduces membrane fluidity at moderate (37C) temperatures
The key enzyme which regulates glycolysis through allosteric binding of ATP and its products is:
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QUESTIONS AND ANSWERS 100% PASS
Which of the following is true for catabolic pathways?
A) they are usually non-spontaneous chemical reactions
B) they consume energy to build up polymers from monomers
C) they release energy as they degrade polymers to monomers
D) they represent endergonic reactions
E) none of the above - ANS C) they release energy as they degrade polymers to monomers
Enzymes speed up metabolic reactions by
A) increasing the activation energy barrier
B) being consumed during the reaction
C) creating more substrate
D) increasing the temperature of the surroundings
E) none of the above - ANS E) none of the above
ATP has the following properties
A) composed of high energy phosphoanhydride bonds
B) can couple with endergonic reactions to produce exergonic reactions
C) can power chemical work in the cell
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, D) can power transport work in the cell
E) all of the above - ANS E) all of the above
The following mechanisms of endocytosis are utilized by cells:
A) receptor-mediated endocytosis
B) cotransport
C) electrogenic pump
D) chemiosmosis
E) none of the above - ANS A) receptor-mediated endocytosis
Which of the following molecules would likely move directly through the lipid bilayer of a
plasma membrane?
A) glucose
B) Ca++
C) O2
D) Na++
E) all of the above - ANS C) O2
The presence of cholesterol in the plasma membranes of some animals
A) reduces membrane fluidity at moderate (37C) temperatures
B) enables the animal to add hydrogen atoms to unsaturated phospholipids
C) makes the membrane less flexible, allowing it to sustain greater pressure from within the
cell
D) is not necessary for membrane function
E) enables the animal to remove hydrogen atoms from saturated phospholipids - ANS A)
reduces membrane fluidity at moderate (37C) temperatures
The key enzyme which regulates glycolysis through allosteric binding of ATP and its products is:
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
