BIO 203 EXAM 2- TEST QUESTIONS
& ANSWERS (RATED A+)
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 - ANSWERC) 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 - ANSWERE) none of the above
The following mechanisms of endocytosis are utilized by cells:
A) cotransport
B) exocytosis
C) pinocytosis
D) electrogenic pump
E) none of the above - ANSWERC) pinocytosis
Which of the following molecules would likely move directly through the lipid
bilayer of a plasma membrane?
A) glucose
B) Na+
C) O2
D) K+
E) Ca++ - ANSWERC) O2
The presence of cholesterol in the plasma membranes of some animals
A) has different effects on membrane fluidity at different temperatures
B) hinders solidification at low temperatures
C) reduces membrane fluidity at moderate (37C) temperatures
D) prevents tight packing of the phospholipids
E) all of the above - ANSWERE) all of the above
Which is an example of a non-protein signaling molecule?
A) receptor tyrosine kinase
B) cyclic AMP
, C) transcription factor
D) adenylyl cyclase
E) all of the above - ANSWERB) cyclic AMP
The primary role of oxygen in cellular respiration is to
A) catalyze the reactions of glycolysis
B) combine with carbon, forming CO2
C) combine with lactate, forming pyruvate
D) act as an acceptor for electrons and hydrogen, forming water
E) yield energy in the form of ATP as it is passed down the respiratory chain -
ANSWERD) act as an acceptor for electrons and hydrogen, forming water
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
D) can power transport work in the cell
E) all of the above - ANSWERE) 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 - ANSWERA) 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 - ANSWERC) 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 -
ANSWERA) reduces membrane fluidity at moderate (37C) temperatures
The key enzyme which regulates glycolysis through allosteric binding of ATP and its
products is:
A) hexokinase
B) ATP synthase
C) rubisco
D) coenzyme A
E) none of the above - ANSWERE) none of the above
& ANSWERS (RATED A+)
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 - ANSWERC) 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 - ANSWERE) none of the above
The following mechanisms of endocytosis are utilized by cells:
A) cotransport
B) exocytosis
C) pinocytosis
D) electrogenic pump
E) none of the above - ANSWERC) pinocytosis
Which of the following molecules would likely move directly through the lipid
bilayer of a plasma membrane?
A) glucose
B) Na+
C) O2
D) K+
E) Ca++ - ANSWERC) O2
The presence of cholesterol in the plasma membranes of some animals
A) has different effects on membrane fluidity at different temperatures
B) hinders solidification at low temperatures
C) reduces membrane fluidity at moderate (37C) temperatures
D) prevents tight packing of the phospholipids
E) all of the above - ANSWERE) all of the above
Which is an example of a non-protein signaling molecule?
A) receptor tyrosine kinase
B) cyclic AMP
, C) transcription factor
D) adenylyl cyclase
E) all of the above - ANSWERB) cyclic AMP
The primary role of oxygen in cellular respiration is to
A) catalyze the reactions of glycolysis
B) combine with carbon, forming CO2
C) combine with lactate, forming pyruvate
D) act as an acceptor for electrons and hydrogen, forming water
E) yield energy in the form of ATP as it is passed down the respiratory chain -
ANSWERD) act as an acceptor for electrons and hydrogen, forming water
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
D) can power transport work in the cell
E) all of the above - ANSWERE) 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 - ANSWERA) 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 - ANSWERC) 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 -
ANSWERA) reduces membrane fluidity at moderate (37C) temperatures
The key enzyme which regulates glycolysis through allosteric binding of ATP and its
products is:
A) hexokinase
B) ATP synthase
C) rubisco
D) coenzyme A
E) none of the above - ANSWERE) none of the above
