BS 161 Exam 2 : Questions And Verified Answers
(Rated A+)
Which stages of cellular respiration produce CO2 as a waste product Right
Ans - pyruvate oxidation and citric acid cycle
What is the net product of glycolysis Right Ans - 2 pyruvate
T/F: Pyruvate oxidation produces a large amount of ATP through substrate-
level phosphorylation Right Ans - false
Which stage of cellular respiration occurs following production of pyruvate
Right Ans - pyruvate oxidation
What happens when glucose is phosphorylated during phase 1 of glycolysis
Right Ans - 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 _________ Right Ans - two; CO2; four; acetyl groups
Which stage of cellular respiration uses O2 as an input Right Ans -
oxidative phosphorylation
The interior region of a phospholipid bilayer is characterized as:
hydrophilic and polar.
hydrophobic.
polar.
hydrophilic. Right Ans - 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 Right Ans - a and d
Long, saturated fatty acid tails _____ lipid mobility and _____ membrane fluidity
enhance; maintain
enhance; increase
reduce; decrease
reduce; increase
maintain; decrease Right Ans - 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 Right Ans - 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. Right Ans - 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 Right Ans - a
`Refer to Animation: Diffusion. At equilibrium, there will be no net movement
of molecules across the cell membrane.
true
false Right Ans - a
Refer to Animation: Diffusion. Simple diffusion of a molecule down its
concentration gradient requires an input of energy to the system.
true
false Right Ans - b
Refer to Animation: Osmosis. Which of the answer choices correctly describes
the movement of water across a selectively permeable membrane during
osmosis?
-The water will move from low solute concentration to high solute
concentration.
-Either of these descriptions is correct and equivalent.
-The water will move from high water concentration to low water
concentration. Right Ans - b
Refer to Animation: Osmosis. A container is divided into two compartments by
a membrane that is fully permeable to water but not to larger molecules.
Water is added to one side of the membrane (side A), and an equal volume of a
5% solution of glucose is added to the other (side B). What would you predict
will happen?
-The water level on side B will increase and on side A will decrease.
-Glucose will diffuse from side A to side B.
-The water level on side A will increase and on side B will decrease.
-Glucose will diffuse from side B to side A. Right Ans - a
Refer to Animation: Active Transport. The defining characteristics of active
transport are that this category of transport moves substances _________ their
concentration gradient and requires ___________.
(Rated A+)
Which stages of cellular respiration produce CO2 as a waste product Right
Ans - pyruvate oxidation and citric acid cycle
What is the net product of glycolysis Right Ans - 2 pyruvate
T/F: Pyruvate oxidation produces a large amount of ATP through substrate-
level phosphorylation Right Ans - false
Which stage of cellular respiration occurs following production of pyruvate
Right Ans - pyruvate oxidation
What happens when glucose is phosphorylated during phase 1 of glycolysis
Right Ans - 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 _________ Right Ans - two; CO2; four; acetyl groups
Which stage of cellular respiration uses O2 as an input Right Ans -
oxidative phosphorylation
The interior region of a phospholipid bilayer is characterized as:
hydrophilic and polar.
hydrophobic.
polar.
hydrophilic. Right Ans - 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 Right Ans - a and d
Long, saturated fatty acid tails _____ lipid mobility and _____ membrane fluidity
enhance; maintain
enhance; increase
reduce; decrease
reduce; increase
maintain; decrease Right Ans - 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 Right Ans - 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. Right Ans - 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 Right Ans - a
`Refer to Animation: Diffusion. At equilibrium, there will be no net movement
of molecules across the cell membrane.
true
false Right Ans - a
Refer to Animation: Diffusion. Simple diffusion of a molecule down its
concentration gradient requires an input of energy to the system.
true
false Right Ans - b
Refer to Animation: Osmosis. Which of the answer choices correctly describes
the movement of water across a selectively permeable membrane during
osmosis?
-The water will move from low solute concentration to high solute
concentration.
-Either of these descriptions is correct and equivalent.
-The water will move from high water concentration to low water
concentration. Right Ans - b
Refer to Animation: Osmosis. A container is divided into two compartments by
a membrane that is fully permeable to water but not to larger molecules.
Water is added to one side of the membrane (side A), and an equal volume of a
5% solution of glucose is added to the other (side B). What would you predict
will happen?
-The water level on side B will increase and on side A will decrease.
-Glucose will diffuse from side A to side B.
-The water level on side A will increase and on side B will decrease.
-Glucose will diffuse from side B to side A. Right Ans - a
Refer to Animation: Active Transport. The defining characteristics of active
transport are that this category of transport moves substances _________ their
concentration gradient and requires ___________.
