BSCI 1510 – EXAM
BSCI 1510 – EXAM QUESTIONS AND ANSWERS GRADED A+
Which of the following would be most likely to cross the plasma
membrane without the aid of a protein?
A. Glucose
B. O2
C. Glycerol
D. Cl-
E. H2O ANS >> B. O2
Extraction of an integral membrane protein from the
membrane requires addition of... ANS >> a detergent
In a polarized epithelial cell of the intestines, the _____ plasma
membrane faces the intestinal lumen and has numerous
transporters for nutrient uptake. ANS >> apical
,BSCI 1510 – EXAM
The ∆G for movement of Na+ down its electrochemical gradient
into the cell is
-3.1 kcal/mol at typical intracellular and extracellular Na+
concentrations and a membrane potential of -70 mV (negative
inside, positive outside). If the membrane potential decreases
to -20 mV, the ∆G for Na+ transport becomes _____. ANS >> less
negative
A single pumping cycle of the Na+/K+ ATPase causes a net
charge displacement of ____ to the outside of the cell. ANS >>
+1
The TCA cycle starts with the reaction acetyl-CoA + ______ ->
Citrate. ANS >> oxaloacetate
Per glucose molecule completely oxidized, how many NADHs
are produced? (You will need to revisit glycolysis, keep in mind
that 2 pyruvates are produced per glucose, and consider all of
the mitochondrial reactions.) ANS >> 10
Where in the cell does the formation of acetyl-CoA take place?
ANS >> mitochondrial matrix
, BSCI 1510 – EXAM
The mitochondrial ATP synthase synthesizes ATP in which
compartment? ANS >> matrix
In the ETC, where are NADH and FADH2 oxidized respectively?
ANS >> Complex I and Complex II
What is the final electron acceptor in the ETC and what
mechanism produces ATP?
A. H2o, movement of H+ down its concentration (from matrix to
IMS) gradient rotates ATP synthase to make ATP
B. O2, movement of H+ down its concentration (from matrix to
IMS) gradient rotates ATP synthase to make ATP
C. O2, movement of H+ down its concentration (from IMS to
matrix) gradient rotates ATP synthase to make ATP
D. H2o, movement of H+ down its concentration (from IMS to
matrix) gradient rotates ATP synthase to make ATP ANS >> C
Which intermediate is produced in gluconeogenesis and the
TCA cycle?
A. Citrate
B. Pyruvate
BSCI 1510 – EXAM QUESTIONS AND ANSWERS GRADED A+
Which of the following would be most likely to cross the plasma
membrane without the aid of a protein?
A. Glucose
B. O2
C. Glycerol
D. Cl-
E. H2O ANS >> B. O2
Extraction of an integral membrane protein from the
membrane requires addition of... ANS >> a detergent
In a polarized epithelial cell of the intestines, the _____ plasma
membrane faces the intestinal lumen and has numerous
transporters for nutrient uptake. ANS >> apical
,BSCI 1510 – EXAM
The ∆G for movement of Na+ down its electrochemical gradient
into the cell is
-3.1 kcal/mol at typical intracellular and extracellular Na+
concentrations and a membrane potential of -70 mV (negative
inside, positive outside). If the membrane potential decreases
to -20 mV, the ∆G for Na+ transport becomes _____. ANS >> less
negative
A single pumping cycle of the Na+/K+ ATPase causes a net
charge displacement of ____ to the outside of the cell. ANS >>
+1
The TCA cycle starts with the reaction acetyl-CoA + ______ ->
Citrate. ANS >> oxaloacetate
Per glucose molecule completely oxidized, how many NADHs
are produced? (You will need to revisit glycolysis, keep in mind
that 2 pyruvates are produced per glucose, and consider all of
the mitochondrial reactions.) ANS >> 10
Where in the cell does the formation of acetyl-CoA take place?
ANS >> mitochondrial matrix
, BSCI 1510 – EXAM
The mitochondrial ATP synthase synthesizes ATP in which
compartment? ANS >> matrix
In the ETC, where are NADH and FADH2 oxidized respectively?
ANS >> Complex I and Complex II
What is the final electron acceptor in the ETC and what
mechanism produces ATP?
A. H2o, movement of H+ down its concentration (from matrix to
IMS) gradient rotates ATP synthase to make ATP
B. O2, movement of H+ down its concentration (from matrix to
IMS) gradient rotates ATP synthase to make ATP
C. O2, movement of H+ down its concentration (from IMS to
matrix) gradient rotates ATP synthase to make ATP
D. H2o, movement of H+ down its concentration (from IMS to
matrix) gradient rotates ATP synthase to make ATP ANS >> C
Which intermediate is produced in gluconeogenesis and the
TCA cycle?
A. Citrate
B. Pyruvate
