Question 1

Turgor pressure is observed when a plant cells environment is ________.

Accepted Answer

A)  hypoosmotic
B)  isosmotic
C)  osmosis
D)  hyperosmoticE) B) and C)
F) All of the above

Question 2

Which mutations can interfere with the proper insertion of a protein in the plasma membrane?

Accepted Answer

A)  A polar amino acid to a nonpolar amino acid within a transmembrane domain
B)  A nonpolar amino acid to a polar amino acid within a transmembrane domain
C)  A polar amino acid to a nonpolar amino acid within a cytoplasmic domain
D)  A nonpolar amino acid to a polar amino acid within a cytoplasmic domainE) None of the above
F) A) and B)

Question 3

In individuals with normal blood sugar levels,glucose is reabsorbed into the bloodstream in the kidney by members of the GLUT transporter family,which form an aqueous pore across the membrane through which glucose can move passively.As a result,no glucose is excreted in urine.However,in people with untreated diabetes mellitus,blood sugar levels are high and glucose is often present in the urine.What can explain this occurrence?

Accepted Answer

A)  High blood glucose levels reverse the concentration gradient,allowing untransported glucose to be excreted in urine.
B)  High blood glucose levels interfere with the coupled transport of water and glucose,allowing untransported glucose to be excreted in urine.
C)  The GLUT transporters become saturated,allowing untransported glucose to be excreted in urine.
D)  The GLUT transporters cannot hydrolyze ATP quickly enough for ATP to transport the extra glucose,thereby allowing untransported glucose to be excreted in urine.E) B) and D)
F) None of the above

Question 4

A research laboratory is attempting to collect the content of human red blood cells.The type of solution researchers should use to cause blood cells to lyse (burst) would be

Accepted Answer

A)  hyperosmotic.
B)  isosmotic.
C)  hypoosmotic.
D)  osmotic.E) A) and D)
F) B) and C)

Question 5

A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass.They inject a 5M solution of glucose into the cell and then place the cell into a beaker containing 10M glucose.What effect do you expect to observe?

Accepted Answer

A)  Water moves out of the cell
B)  Glucose moves out of the cell
C)  No net change in cell weight
D)  Water moves into the cell
E)  Glucose moves into the cellF) A) and B)
G) A) and C)

Question 6

The accumulation of amino acids and sugars in animal cells can occur through

Accepted Answer

A)  ATP pumps.
B)  sodium-potassium pumps.
C)  glucose pumps.
D)  coupled transport.
E)  proton pumps.F) All of the above
G) A) and E)

Question 7

Choose all that apply.A concentration gradient is exhibited when

Accepted Answer

A)  the room temperature is 34 degree Celsius and the outside air is 34 degrees Celsius.
B)  intracellular fluid has 5% solute and extracellular fluid has 0.8% solute concentration.
C)  during rest,muscle and liver cells contain high glycogen concentration and blood contains lower concentrations.
D)  the pCO2 changes from 45 to 35 mmHg in the alveoli of lungs.E) C) and D)
F) All of the above B,C,D

Question 8

Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport?

Accepted Answer

A)  carrier
B)  cytoskeletal
C)  structural
D)  targetedE) None of the above
F) B) and C)

Question 9

An individual is constipated.They take magnesium salts to help loosen the stool.Why does this work?

Accepted Answer

A)  Water moves from the intestines to the blood because the blood is hypertonic
B)  Water moves from the intestines to the blood because the blood is hypotonic.
C)  Water moves from the blood to the intestines because the blood is hypertonic
D)  Water moves from the blood to the intestines because the blood is hypotonic.E) C) and D)
F) B) and C)

Question 10

In the process of diffusion,molecules move from areas where

Accepted Answer

A)  their concentration is higher to areas where their concentration is lower until an equilibrium is reached.
B)  their concentration is lower to areas where their concentration is higher until an equilibrium is reached.
C)  their concentration is lower to areas where their concentration is higher through specific protein channels or carriers.
D)  their concentration is higher to areas where their concentration is lower using energy from ATP.E) A) and B)
F) None of the above

Question 11

In a single sodium-potassium pump cycle,ATP is used with the result that

Accepted Answer

A)  3 sodium ions leave and 2 potassium ions enter.
B)  2 sodium ion enters and 1 potassium ion leaves.
C)  2 sodium ion leaves and 1 potassium ion enters.
D)  3 sodium ions enter and 2 potassium ions leave.
E)  sodium and potassium ions enter and water leaves.F) A) and B)
G) A) and C)

Question 12

If you were to replace the phosphate group of a phospholipid with a fatty acid chain,you would have

Accepted Answer

A)  glycerol.
B)  a triglyceride.
C)  cholesterol.
D)  glycolipid.E) A) and B)
F) C) and D)

Question 13

The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its

Accepted Answer

A)  conformation.
B)  amino acid sequence.
C)  net charge.
D)  solubility.
E)  immunity.F) All of the above
G) C) and D)

Question 14

In bacteria,fungi,and plants the high internal pressure generated by osmosis is counteracted by the mechanical strength of their

Accepted Answer

A)  plasma membranes.
B)  organelles.
C)  cytoskeletons.
D)  cell walls.E) B) and D)
F) A) and C)

Question 15

Membrane proteins serve many functions.One of the functions is transportation of substances across the membrane.If a cell biologist placed cells into an environment in which a chemical has been added that blocks the function of only carrier proteins,the process that will be affected is

Accepted Answer

A)  active transport.
B)  osmosis.
C)  simple diffusion.
D)  phagocytosis.
E)  pinocytosis.F) A) and B)
G) A) and E)

Question 16

The type of movement of molecules that is specific and passive,and which becomes saturated if all of the protein carriers are in use is

Accepted Answer

A)  exocytosis.
B)  facilitated diffusion.
C)  active transport.
D)  endocytosis.
E)  osmosis.F) A) and B)
G) C) and D)

Question 17

A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour.Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?

Accepted Answer

A)  Estrogen (C18H24O2) 
B)  NH4+
C)  O2
D)  CH3COO-
E)  Na+F) C) and D)
G) A) and E) C

Question 18

How can freeze-fracture be used to determine the orientation of a protein in a membrane?

Accepted Answer

A)  Freeze-fracture allows a cell to be cleaved in between the lipid bilayer,splitting the plasma membrane into two layers.
B)  Freeze-fracture allows a cell to be cleaved in such a way as to preserve the embedded proteins.
C)  Freeze-fracture cuts the membrane in protein-sized components for viewing under an electron microscope.D) A) and B)
E) All of the above

Question 19

The movement of substances from regions where their concentration is higher to regions where their concentration is lower is called

Accepted Answer

A)  active transport.
B)  diffusion.
C)  pinocytosis.
D)  pumping.
E)  exocytosis.F) B) and C)
G) All of the above B

Question 20

Three (3) eggs are boiled and all weigh 2g.The eggs are placed in a 15% solution of NaCl and reweighed after 30 minutes.
  McGraw-Hill Education
-When compared to the solution,the egg that gained weight was ________.

Accepted Answer

A)  Hypertonic
B)  Hypotonic
C)  IsotonicD) A) and C)
E) B) and C)

Exam 5: Membranes

Turgor pressure is observed when a plant cells environment is ________.

Correct Answer
verified

Which mutations can interfere with the proper insertion of a protein in the plasma membrane?

Correct Answer
verified

Correct Answer
verified

A research laboratory is attempting to collect the content of human red blood cells.The type of solution researchers should use to cause blood cells to lyse (burst) would be

Correct Answer
verified

A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass.They inject a 5M solution of glucose into the cell and then place the cell into a beaker containing 10M glucose.What effect do you expect to observe?

Correct Answer
verified

The accumulation of amino acids and sugars in animal cells can occur through

Correct Answer
verified

Choose all that apply.A concentration gradient is exhibited when

Correct Answer
verified
B,C,D

Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport?

Correct Answer
verified

An individual is constipated.They take magnesium salts to help loosen the stool.Why does this work?

Correct Answer
verified

In the process of diffusion,molecules move from areas where

Correct Answer
verified

In a single sodium-potassium pump cycle,ATP is used with the result that

Correct Answer
verified

If you were to replace the phosphate group of a phospholipid with a fatty acid chain,you would have

Correct Answer
verified

The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its

Correct Answer
verified

In bacteria,fungi,and plants the high internal pressure generated by osmosis is counteracted by the mechanical strength of their

Correct Answer
verified

Membrane proteins serve many functions.One of the functions is transportation of substances across the membrane.If a cell biologist placed cells into an environment in which a chemical has been added that blocks the function of only carrier proteins,the process that will be affected is

Correct Answer
verified

The type of movement of molecules that is specific and passive,and which becomes saturated if all of the protein carriers are in use is

Correct Answer
verified

A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour.Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?

Correct Answer
verified
C

How can freeze-fracture be used to determine the orientation of a protein in a membrane?

Correct Answer
verified

The movement of substances from regions where their concentration is higher to regions where their concentration is lower is called

Correct Answer
verified
B

Three (3) eggs are boiled and all weigh 2g.The eggs are placed in a 15% solution of NaCl and reweighed after 30 minutes. McGraw-Hill Education -When compared to the solution,the egg that gained weight was ________.

Correct Answer
verified

Exam 5: Membranes

Turgor pressure is observed when a plant cells environment is ________.

Correct AnswerverifiedShow Answer

Which mutations can interfere with the proper insertion of a protein in the plasma membrane?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A research laboratory is attempting to collect the content of human red blood cells.The type of solution researchers should use to cause blood cells to lyse (burst) would be

Correct AnswerverifiedShow Answer

A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass.They inject a 5M solution of glucose into the cell and then place the cell into a beaker containing 10M glucose.What effect do you expect to observe?

Correct AnswerverifiedShow Answer

The accumulation of amino acids and sugars in animal cells can occur through

Correct AnswerverifiedShow Answer

Choose all that apply.A concentration gradient is exhibited when

Correct AnswerverifiedB,C,D

Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport?

Correct AnswerverifiedShow Answer

An individual is constipated.They take magnesium salts to help loosen the stool.Why does this work?

Correct AnswerverifiedShow Answer

In the process of diffusion,molecules move from areas where

Correct AnswerverifiedShow Answer

In a single sodium-potassium pump cycle,ATP is used with the result that

Correct AnswerverifiedShow Answer

If you were to replace the phosphate group of a phospholipid with a fatty acid chain,you would have

Correct AnswerverifiedShow Answer

The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its

Correct AnswerverifiedShow Answer

In bacteria,fungi,and plants the high internal pressure generated by osmosis is counteracted by the mechanical strength of their

Correct AnswerverifiedShow Answer

Membrane proteins serve many functions.One of the functions is transportation of substances across the membrane.If a cell biologist placed cells into an environment in which a chemical has been added that blocks the function of only carrier proteins,the process that will be affected is

Correct AnswerverifiedShow Answer

The type of movement of molecules that is specific and passive,and which becomes saturated if all of the protein carriers are in use is

Correct AnswerverifiedShow Answer

A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour.Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?

Correct AnswerverifiedC

How can freeze-fracture be used to determine the orientation of a protein in a membrane?

Correct AnswerverifiedShow Answer

The movement of substances from regions where their concentration is higher to regions where their concentration is lower is called

Correct AnswerverifiedB

Three (3) eggs are boiled and all weigh 2g.The eggs are placed in a 15% solution of NaCl and reweighed after 30 minutes. McGraw-Hill Education -When compared to the solution,the egg that gained weight was ________.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B,C,D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified