BIL 150 GAINES PRACTICE EXAM AND
ANSWERS GRADED A+.
B. If a new species of bacteria is discovered, it will be made up of organic molecules. - Answer
Which of the following is an example of deductive reasoning?
A. All objects on Earth will fall down when dropped, and none will "fall up."
B. If a new species of bacteria is discovered, it will be made up of organic molecules.
C. Living objects are composed of cells.
D. Atoms make up molecules, which make up cells, which make up tissues.
E. All swans are white
E. ribosomes - Answer In the fractionation of homogenized cells using differential
centrifugation, which of the following will require the greatest speed to form pellets at the
bottom of the tube?
A. peroxisomes
B. nuclei
C. mitochondria
D. chloroplasts
E. ribosomes
C. A and B - Answer Questions 3-6 refer to the figure below
Five dialysis bags, constructed from a semi-permeable membrane that is impermeable to
sucrose, were filled with various concentrations of sucrose and then placed in separate beakers
containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags
were weighed and the percent change in mass of each bag was graphed.
IMAGE
Which line or lines represent(s) bags that contain a solution that is hypertonic at the end of 30
minutes?
,E. D and E
B. B - Answer Questions 3-6 refer to the figure below
Five dialysis bags, constructed from a semi-permeable membrane that is impermeable to
sucrose, were filled with various concentrations of sucrose and then placed in separate beakers
containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags
were weighed and the percent change in mass of each bag was graphed.
IMAGE
Which line or lines represent(s) bags that contain a solution that is hypertonic at the end of 60
minutes?
A. A
B. B
C. A and B
D. C
E. D and E
E. A - Answer Questions 3-6 refer to the figure below
Five dialysis bags, constructed from a semi-permeable membrane that is impermeable to
sucrose, were filled with various concentrations of sucrose and then placed in separate beakers
containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags
were weighed and the percent change in mass of each bag was graphed.
IMAGE
Which line or lines represent(s) bags that initially contain the greatest amount of solute?
A. A
B. A and B
C. C
D. D
, A. A and B
B. B and C
C. C
D. D and E
E. All the bags initially had the same concentration of solute as in the beaker.
E. a food molecule made up of energy-rich macromolecules - Answer Which of the following is
an example of potential rather than kinetic energy?
A. a boy mowing grass
B. a firefly using light flashes to attract a mate
C. an insect foraging for food
D. water rushing over Niagara Falls
E. a food molecule made up of energy-rich macromolecules
D. water - Answer If you were to expose cells that are undergoing cellular respiration to a
radioactive oxygen isotope in the form of O2, which of the following molecules would you
expect to be radiolabeled?
A. CO2
B. NADH
C. pyruvate
D. water
E. lactic acid
C. Because cholesterol is amphipathic, it fits in between the phospholipids and blocks diffusion
through the membrane. - Answer Which of the following is the best explanation for why
cholesterol decreases the permeability of biological membranes?
A. Cholesterol binds to the outside surface of a membrane, thus blocking the movement of
solutes.
B. Because cholesterol is amphipathic, it forms tiny vesicles that trap solutes.
ANSWERS GRADED A+.
B. If a new species of bacteria is discovered, it will be made up of organic molecules. - Answer
Which of the following is an example of deductive reasoning?
A. All objects on Earth will fall down when dropped, and none will "fall up."
B. If a new species of bacteria is discovered, it will be made up of organic molecules.
C. Living objects are composed of cells.
D. Atoms make up molecules, which make up cells, which make up tissues.
E. All swans are white
E. ribosomes - Answer In the fractionation of homogenized cells using differential
centrifugation, which of the following will require the greatest speed to form pellets at the
bottom of the tube?
A. peroxisomes
B. nuclei
C. mitochondria
D. chloroplasts
E. ribosomes
C. A and B - Answer Questions 3-6 refer to the figure below
Five dialysis bags, constructed from a semi-permeable membrane that is impermeable to
sucrose, were filled with various concentrations of sucrose and then placed in separate beakers
containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags
were weighed and the percent change in mass of each bag was graphed.
IMAGE
Which line or lines represent(s) bags that contain a solution that is hypertonic at the end of 30
minutes?
,E. D and E
B. B - Answer Questions 3-6 refer to the figure below
Five dialysis bags, constructed from a semi-permeable membrane that is impermeable to
sucrose, were filled with various concentrations of sucrose and then placed in separate beakers
containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags
were weighed and the percent change in mass of each bag was graphed.
IMAGE
Which line or lines represent(s) bags that contain a solution that is hypertonic at the end of 60
minutes?
A. A
B. B
C. A and B
D. C
E. D and E
E. A - Answer Questions 3-6 refer to the figure below
Five dialysis bags, constructed from a semi-permeable membrane that is impermeable to
sucrose, were filled with various concentrations of sucrose and then placed in separate beakers
containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags
were weighed and the percent change in mass of each bag was graphed.
IMAGE
Which line or lines represent(s) bags that initially contain the greatest amount of solute?
A. A
B. A and B
C. C
D. D
, A. A and B
B. B and C
C. C
D. D and E
E. All the bags initially had the same concentration of solute as in the beaker.
E. a food molecule made up of energy-rich macromolecules - Answer Which of the following is
an example of potential rather than kinetic energy?
A. a boy mowing grass
B. a firefly using light flashes to attract a mate
C. an insect foraging for food
D. water rushing over Niagara Falls
E. a food molecule made up of energy-rich macromolecules
D. water - Answer If you were to expose cells that are undergoing cellular respiration to a
radioactive oxygen isotope in the form of O2, which of the following molecules would you
expect to be radiolabeled?
A. CO2
B. NADH
C. pyruvate
D. water
E. lactic acid
C. Because cholesterol is amphipathic, it fits in between the phospholipids and blocks diffusion
through the membrane. - Answer Which of the following is the best explanation for why
cholesterol decreases the permeability of biological membranes?
A. Cholesterol binds to the outside surface of a membrane, thus blocking the movement of
solutes.
B. Because cholesterol is amphipathic, it forms tiny vesicles that trap solutes.
