BIOCHEMISTRY FINAL EXAM 2025-2026
QUESTIONS AND CORRECT ANSWERS GRADED
A+
Which of the following statements is not true regarding ATP synthase?
a. protons are passed through ATP synthase from an environment of high proton
concentration to low proton concentration
b. ATP is produced in the α subunits in the L conformation
c. ADP and Pi bind to the β subunits in the O conformation
d. conformational changes that lead to ATP synthesis are caused by rotation of the
γ and ε subunits
ATP is produced in the α subunits in the L conformation
The carnitine-acylcarnitine translocase is an example of a(n)
antiporter
,In β-oxidation of this molecule, the two carbons removed in the last step of this
cycle are carbons numbered
1 and 2
The following kinetic parameters were determined for two different enzymes by
measuring rate (v0) as a function of substrate concentration [S].
For enzyme A: Km = 15 μM and vmax= 200 μM s-1.
For enzyme B: Km = 5 μM and vmax= 200 μM s-1.
At [S] = 10 μM
v0 is greater for enzyme B
An allosteric enzyme with a very small c value (e.g. 0.0001) will
respond in an 'on/off' manner over a narrow range of substrate concentrations
Polysaccharides consisting of multiple glucose molecules connected by α-1,4
glycosidic bonds forming open, curved chains with extensive branching are used
for
fuel storage
Structural lipids found in membranes differ from fuel storage lipids (triglycerides)
in that structural lipids
contain a polar head group
,The potassium channel does not transport sodium ions (Na+) because
the energetic cost of desolation is greater than the favorable free energy of binding
to the selectivity filter
In the presence of rotenone, an inhibitor of complex I in electron transport
NAD+/NADH will be in the _____________ form.
reduced
In electron transport, electrons flow in the direction of
ow to high reduction potential (E0′)
Glycerol from the breakdown of triglycerides is transported to the liver. during
periods of glucagon signaling, glycerol will be converted to __________ in the
liver.
glucose
Water.....
- in liquid form is a dynamic, fluctuating lattice with hydrogen bonds being formed
and broken on the picosecond to nanosecond timescale
- is a polar molecule
- is vital to the formation of barriers (membranes) through the hydrophobic effect
, Caffeine inhibits the breakdown of cAMP when it is no longer needed. After
ingesting large amounts of caffeine you will
- have more molecules of active protein kinase A
- break down more triglycerides into fatty acids
Polysaccharides consisting of multiple glucose molecules connected by B-1,4
glycosidic bonds forming long, straight chains held together by extensive hydrogen
bonding are used for?
structure and support
___________ are structural lipids and likely to be found in membrane bilayers
glycerophospholipids
Glycerol from the breakdown of triglycerides is transported to the liver. Under
conditions of high AMP and low ATP, glycerol will be converted to _______ in
the liver?
Pyruvate
People on low carbohydrate diets form ketone bodies because glucose is not
available to use as an energy source. This phenomenon occurs because glucose is
necessary for the production of?
Oxaloacetate
QUESTIONS AND CORRECT ANSWERS GRADED
A+
Which of the following statements is not true regarding ATP synthase?
a. protons are passed through ATP synthase from an environment of high proton
concentration to low proton concentration
b. ATP is produced in the α subunits in the L conformation
c. ADP and Pi bind to the β subunits in the O conformation
d. conformational changes that lead to ATP synthesis are caused by rotation of the
γ and ε subunits
ATP is produced in the α subunits in the L conformation
The carnitine-acylcarnitine translocase is an example of a(n)
antiporter
,In β-oxidation of this molecule, the two carbons removed in the last step of this
cycle are carbons numbered
1 and 2
The following kinetic parameters were determined for two different enzymes by
measuring rate (v0) as a function of substrate concentration [S].
For enzyme A: Km = 15 μM and vmax= 200 μM s-1.
For enzyme B: Km = 5 μM and vmax= 200 μM s-1.
At [S] = 10 μM
v0 is greater for enzyme B
An allosteric enzyme with a very small c value (e.g. 0.0001) will
respond in an 'on/off' manner over a narrow range of substrate concentrations
Polysaccharides consisting of multiple glucose molecules connected by α-1,4
glycosidic bonds forming open, curved chains with extensive branching are used
for
fuel storage
Structural lipids found in membranes differ from fuel storage lipids (triglycerides)
in that structural lipids
contain a polar head group
,The potassium channel does not transport sodium ions (Na+) because
the energetic cost of desolation is greater than the favorable free energy of binding
to the selectivity filter
In the presence of rotenone, an inhibitor of complex I in electron transport
NAD+/NADH will be in the _____________ form.
reduced
In electron transport, electrons flow in the direction of
ow to high reduction potential (E0′)
Glycerol from the breakdown of triglycerides is transported to the liver. during
periods of glucagon signaling, glycerol will be converted to __________ in the
liver.
glucose
Water.....
- in liquid form is a dynamic, fluctuating lattice with hydrogen bonds being formed
and broken on the picosecond to nanosecond timescale
- is a polar molecule
- is vital to the formation of barriers (membranes) through the hydrophobic effect
, Caffeine inhibits the breakdown of cAMP when it is no longer needed. After
ingesting large amounts of caffeine you will
- have more molecules of active protein kinase A
- break down more triglycerides into fatty acids
Polysaccharides consisting of multiple glucose molecules connected by B-1,4
glycosidic bonds forming long, straight chains held together by extensive hydrogen
bonding are used for?
structure and support
___________ are structural lipids and likely to be found in membrane bilayers
glycerophospholipids
Glycerol from the breakdown of triglycerides is transported to the liver. Under
conditions of high AMP and low ATP, glycerol will be converted to _______ in
the liver?
Pyruvate
People on low carbohydrate diets form ketone bodies because glucose is not
available to use as an energy source. This phenomenon occurs because glucose is
necessary for the production of?
Oxaloacetate
