BS 161 Exam 2 UPDATED ACTUAL
Questions and CORRECT Answers
which stages of cellular respiration produce CO2 as a waste product - CORRECT
ANSWER - pyruvate oxidation and citric acid cycle
what is the net product of glycolysis - CORRECT ANSWER - 2 pyruvate
T/F: Pyruvate oxidation produces a large amount of ATP through substrate-level
phosphorylation - CORRECT ANSWER - false
which stage of cellular respiration occurs following production of pyruvate - CORRECT
ANSWER - pyruvate oxidation
what happens when glucose is phosphorylated during phase 1 of glycolysis - CORRECT
ANSWER - glucose is destabilized so it can be broken apart in phase 2
of the 6 carbons in a starting molecule of glucose, at the completion of pyruvate oxidation, _____
carbons are fully oxidized to _____, while _______ carbons remain in _________ - CORRECT
ANSWER - two; CO2; four; acetyl groups
which stage of cellular respiration uses O2 as an input - CORRECT ANSWER - oxidative
phosphorylation
The interior region of a phospholipid bilayer is characterized as:
hydrophilic and polar.
hydrophobic.
polar.
hydrophilic. - CORRECT ANSWER -b
,In water, phospholipids can spontaneously form lipid bilayer structures. What
bonds/forces/interactions are most influential in formation of the lipid bilayer?
-hydrogen bond interactions among water molecules and polar phospholipid heads
-ionic interactions among Cl- ions and phosphates in the phospholipid heads
-van der Waals attractions among water molecules and fatty acid tails
-hydrophobic exclusion of nonpolar fatty acid tails
-covalent bonds among phospholipids - CORRECT ANSWER - a and d
Long, saturated fatty acid tails _____ lipid mobility and _____ membrane fluidity
enhance; maintain
enhance; increase
reduce; decrease
reduce; increase
maintain; decrease - CORRECT ANSWER -c
A transmembrane protein is a protein that spans the entire lipid bilayer. Which of the following
amino acids would likely be found the hydrophobic region that is embedded in the membrane?
alanine
serine
arginine
lysine
glutamic acid - CORRECT ANSWER -a
Refer to Animation: Diffusion. Diffusion is best described as the random movement of
molecules influenced by:
, -the width of the plasma membrane of the cell.
-energy transferred from molecular collisions in the cell.
-the thermal energy of the environment and energy transferred from molecular collisions in the
cell.
-the thermal energy of the environment and the width of the plasma membrane.
-the thermal energy of the environment. - CORRECT ANSWER -c
Refer to Animation: Diffusion. Molecules that are _____________ and _____________ are able
to move across the cell membrane via simple diffusion.
hydrophobic; small
hydrophobic; large
hydrophilic; large
hydrophilic; small - CORRECT ANSWER -a
`Refer to Animation: Diffusion. At equilibrium, there will be no net movement of molecules
across the cell membrane.
true
false - CORRECT ANSWER -a
Refer to Animation: Diffusion. Simple diffusion of a molecule down its concentration gradient
requires an input of energy to the system.
true
false - CORRECT ANSWER -b
Refer to Animation: Osmosis. Which of the answer choices correctly describes the movement of
water across a selectively permeable membrane during osmosis?
Questions and CORRECT Answers
which stages of cellular respiration produce CO2 as a waste product - CORRECT
ANSWER - pyruvate oxidation and citric acid cycle
what is the net product of glycolysis - CORRECT ANSWER - 2 pyruvate
T/F: Pyruvate oxidation produces a large amount of ATP through substrate-level
phosphorylation - CORRECT ANSWER - false
which stage of cellular respiration occurs following production of pyruvate - CORRECT
ANSWER - pyruvate oxidation
what happens when glucose is phosphorylated during phase 1 of glycolysis - CORRECT
ANSWER - glucose is destabilized so it can be broken apart in phase 2
of the 6 carbons in a starting molecule of glucose, at the completion of pyruvate oxidation, _____
carbons are fully oxidized to _____, while _______ carbons remain in _________ - CORRECT
ANSWER - two; CO2; four; acetyl groups
which stage of cellular respiration uses O2 as an input - CORRECT ANSWER - oxidative
phosphorylation
The interior region of a phospholipid bilayer is characterized as:
hydrophilic and polar.
hydrophobic.
polar.
hydrophilic. - CORRECT ANSWER -b
,In water, phospholipids can spontaneously form lipid bilayer structures. What
bonds/forces/interactions are most influential in formation of the lipid bilayer?
-hydrogen bond interactions among water molecules and polar phospholipid heads
-ionic interactions among Cl- ions and phosphates in the phospholipid heads
-van der Waals attractions among water molecules and fatty acid tails
-hydrophobic exclusion of nonpolar fatty acid tails
-covalent bonds among phospholipids - CORRECT ANSWER - a and d
Long, saturated fatty acid tails _____ lipid mobility and _____ membrane fluidity
enhance; maintain
enhance; increase
reduce; decrease
reduce; increase
maintain; decrease - CORRECT ANSWER -c
A transmembrane protein is a protein that spans the entire lipid bilayer. Which of the following
amino acids would likely be found the hydrophobic region that is embedded in the membrane?
alanine
serine
arginine
lysine
glutamic acid - CORRECT ANSWER -a
Refer to Animation: Diffusion. Diffusion is best described as the random movement of
molecules influenced by:
, -the width of the plasma membrane of the cell.
-energy transferred from molecular collisions in the cell.
-the thermal energy of the environment and energy transferred from molecular collisions in the
cell.
-the thermal energy of the environment and the width of the plasma membrane.
-the thermal energy of the environment. - CORRECT ANSWER -c
Refer to Animation: Diffusion. Molecules that are _____________ and _____________ are able
to move across the cell membrane via simple diffusion.
hydrophobic; small
hydrophobic; large
hydrophilic; large
hydrophilic; small - CORRECT ANSWER -a
`Refer to Animation: Diffusion. At equilibrium, there will be no net movement of molecules
across the cell membrane.
true
false - CORRECT ANSWER -a
Refer to Animation: Diffusion. Simple diffusion of a molecule down its concentration gradient
requires an input of energy to the system.
true
false - CORRECT ANSWER -b
Refer to Animation: Osmosis. Which of the answer choices correctly describes the movement of
water across a selectively permeable membrane during osmosis?
