Question 1

Compare and contrast exocytosis and endocytosis.

Accepted Answer

Both processes require the input of ener

Question 2

Which of the following is not true regarding active transport?

Accepted Answer

A)  moves molecules or ions against their concentration gradient 
B)  involves protein pumps 
C)  is associated with large numbers of mitochondria 
D)  is associated with nerve and muscle cells 
E)  cannot be done by animal cells 
A)  moves molecules or ions against their concentration gradient 
B)  involves protein pumps 
C)  is associated with large numbers of mitochondria 
D)  is associated with nerve and muscle cells 
E)  cannot be done by animal cells

Question 3

Which statement is false concerning movement of molecules across the cell membrane?

Accepted Answer

A)  Water and gas molecules have no difficulty. 
B)  Small uncharged molecules pass through easily. 
C)  Large molecules do not pass through easily. 
D)  Charged molecules do not pass through easily. 
E)  Lipid molecules do not pass through easily. 
A)  Water and gas molecules have no difficulty. 
B)  Small uncharged molecules pass through easily. 
C)  Large molecules do not pass through easily. 
D)  Charged molecules do not pass through easily. 
E)  Lipid molecules do not pass through easily.

Question 4

Kidney dialysis relies on diffusion of various dissolved waste molecules (solutes)across a non-living semipermeable membrane.If the concentration of solutes in the blood increases over time before dialysis is administered,what will happen to the rate of dialysis when it occurs?

Accepted Answer

A)  It will remain the same since there are no carrier molecules in a non-living membrane. 
B)  The rate will slow down since the solute is more viscous. 
C)  The rate will speed up since the concentration gradient is higher. 
D)  It will remain the same since there is no active transport in a non-living membrane. 
E)  The rate will depend on the amount of time given for diffusion to take place. 
A)  It will remain the same since there are no carrier molecules in a non-living membrane. 
B)  The rate will slow down since the solute is more viscous. 
C)  The rate will speed up since the concentration gradient is higher. 
D)  It will remain the same since there is no active transport in a non-living membrane. 
E)  The rate will depend on the amount of time given for diffusion to take place.

Question 5

What property of phospholipids make them suitable for the formation of the double layer found in membranes?

Accepted Answer

A)  they are uncharged 
B)  they can interact with proteins 
C)  they are composed of fatty acids 
D)  they have both a hydrophobic and a hydrophilic end 
E)  they serve as an attachment site for carbohydrates 
A)  they are uncharged 
B)  they can interact with proteins 
C)  they are composed of fatty acids 
D)  they have both a hydrophobic and a hydrophilic end 
E)  they serve as an attachment site for carbohydrates

Question 6

What will happen to dye crystals if placed in the bottom of a beaker of water over a long period of time?

Accepted Answer

A)  They will undergo osmosis to a different location. 
B)  They will undergo active transport to a different location. 
C)  They will all diffuse to the top of the beaker. 
D)  They will diffuse equally throughout the beaker. 
E)  They will stay at the bottom of the beaker. 
A)  They will undergo osmosis to a different location. 
B)  They will undergo active transport to a different location. 
C)  They will all diffuse to the top of the beaker. 
D)  They will diffuse equally throughout the beaker. 
E)  They will stay at the bottom of the beaker.

Question 7

Osmosis can occur when a membrane is

Accepted Answer

A)  impermeable. 
B)  semipermeable. 
C)  permeable. 
D)  plasmolyzed. 
E)  absent. 
A)  impermeable. 
B)  semipermeable. 
C)  permeable. 
D)  plasmolyzed. 
E)  absent.

Question 8

If you have a 10% sugar solution and a 35% sugar solution how does the 10% solution compare to the 35% solution?

Accepted Answer

A)  isotonic 
B)  sweeter 
C)  osmotic 
D)  hypotonic 
E)  hypertonic 
A)  isotonic 
B)  sweeter 
C)  osmotic 
D)  hypotonic 
E)  hypertonic

Question 9

Explain the difference between peripheral proteins and integral proteins as they relate to the cell membrane.

Accepted Answer

Peripheral proteins are associated with

Question 10

Which of the following molecules add stiffness and strength to the plasma membrane?

Accepted Answer

A)  glycoproteins 
B)  cholesterol 
C)  phospholipids 
D)  enzymatic proteins 
E)  phosphate groups 
A)  glycoproteins 
B)  cholesterol 
C)  phospholipids 
D)  enzymatic proteins 
E)  phosphate groups

Question 11

The definition of osmosis is the

Accepted Answer

A)  the movement of solute molecules from a higher concentration to a lower concentration. 
B)  diffusion of water across a selectively permeable membrane. 
C)  likelihood that water will diffuse in a particular direction. 
D)  lower concentration of a solute in a solution. 
E)  movement of water toward a higher water concentration. 
A)  the movement of solute molecules from a higher concentration to a lower concentration. 
B)  diffusion of water across a selectively permeable membrane. 
C)  likelihood that water will diffuse in a particular direction. 
D)  lower concentration of a solute in a solution. 
E)  movement of water toward a higher water concentration.

Question 12

In the Malpighian tubules of an insect (blind,threadlike excretory tubule attached to the gut of an insect),salt molecules are actively transferred from body fluids to the inside of the tubule.Which of the following is NOT true?

Accepted Answer

A)  Water is also "pulled" by osmosis into the Malpighian tubule. 
B)  The concentration of salt is normally higher in the body fluids than it is inside the tubule. 
C)  The process decreases the salt concentration of the body fluids. 
D)  Insects must excrete excess salt through the Malpighian tubules. 
E)  The tubules have the same tonicity as the body fluids. 
A)  Water is also "pulled" by osmosis into the Malpighian tubule. 
B)  The concentration of salt is normally higher in the body fluids than it is inside the tubule. 
C)  The process decreases the salt concentration of the body fluids. 
D)  Insects must excrete excess salt through the Malpighian tubules. 
E)  The tubules have the same tonicity as the body fluids.

Question 13

When an intestinal cell ingests substances inside very small vesicles that can only be seen with an electron microscope,this is

Accepted Answer

A)  pinocytosis. 
B)  phagocytosis. 
C)  exocytosis. 
D)  active transport. 
E)  diffusion. 
A)  pinocytosis. 
B)  phagocytosis. 
C)  exocytosis. 
D)  active transport. 
E)  diffusion.

Question 14

A cell placed in a hypotonic solution will

Accepted Answer

A)  lose water. 
B)  gain water. 
C)  neither gain nor lose water. 
D)  lose water initially and then gain water. 
E)  gain water initially and then lose water. 
A)  lose water. 
B)  gain water. 
C)  neither gain nor lose water. 
D)  lose water initially and then gain water. 
E)  gain water initially and then lose water.

Question 15

Which of the following factors could cause the cell membrane to become less permeable?

Accepted Answer

A)  If the channel proteins were to denature and become inactive. 
B)  If the molecules trying to enter the cell were decreased in size. 
C)  If the hydrophilic head of the phospholipids were to become hydrophobic while the hydrophobic tails become hydrophilic. 
D)  If the size of the protein channel was to increase. 
E)  All of these choices would cause the cell membrane to become less permeable. 
A)  If the channel proteins were to denature and become inactive. 
B)  If the molecules trying to enter the cell were decreased in size. 
C)  If the hydrophilic head of the phospholipids were to become hydrophobic while the hydrophobic tails become hydrophilic. 
D)  If the size of the protein channel was to increase. 
E)  All of these choices would cause the cell membrane to become less permeable.

Question 16

Red blood cells come in many blood types including A,B,AB and type O (lacking proteins A and B),Rh positive,Rh negative (lacking Rh+),and many others.If blood is transfused,the recipient detects any new or foreign proteins.The blood type proteins are

Accepted Answer

A)  in the red blood cell nucleus. 
B)  inside the red blood cell cytoplasm. 
C)  on the outer surface of the red blood cell membrane. 
D)  in the nuclear membrane. 
E)  in the endoplasmic reticulum of the red blood cells. 
A)  in the red blood cell nucleus. 
B)  inside the red blood cell cytoplasm. 
C)  on the outer surface of the red blood cell membrane. 
D)  in the nuclear membrane. 
E)  in the endoplasmic reticulum of the red blood cells.

Question 17

Proteins do NOT pass through cell membranes because

Accepted Answer

A)  the membrane is made of protein. 
B)  they contain nitrogen. 
C)  they are very large molecules. 
D)  they cause emulsification. 
E)  they cause digestion of the cell. 
A)  the membrane is made of protein. 
B)  they contain nitrogen. 
C)  they are very large molecules. 
D)  they cause emulsification. 
E)  they cause digestion of the cell.

Question 18

A differentially permeable membrane separates a molasses solution from distilled water.Over time,the

Accepted Answer

A)  molasses will be found in the water. 
B)  molasses will become more dilute. 
C)  molasses solution will become more concentrated. 
D)  molasses will be found in water and it will be more concentrated. 
E)  solutions will remain the same. 
A)  molasses will be found in the water. 
B)  molasses will become more dilute. 
C)  molasses solution will become more concentrated. 
D)  molasses will be found in water and it will be more concentrated. 
E)  solutions will remain the same.

Question 19

The extracellular matrix is responsible for which of the following features?

Accepted Answer

A)  The extracellular matrix does all of these features. 
B)  The extracellular matrix helps the cell resist stretching. 
C)  The extracellular matrix enables the cell to adhere to neighboring cells. 
D)  The extracellular matrix plays a role in cell signaling. 
E)  The extracellular matrix acts as a structural feature. 
A)  The extracellular matrix does all of these features. 
B)  The extracellular matrix helps the cell resist stretching. 
C)  The extracellular matrix enables the cell to adhere to neighboring cells. 
D)  The extracellular matrix plays a role in cell signaling. 
E)  The extracellular matrix acts as a structural feature.

Question 20

If 0.9% NaCl were isotonic to a cell,then

Accepted Answer

A)  0.9% would also be hypotonic. 
B)  0.9% would also be hypertonic. 
C)  1.0% would be hypertonic. 
D)  1.0% would be hypotonic. 
E)  0.1% would be hypertonic. 
A)  0.9% would also be hypotonic. 
B)  0.9% would also be hypertonic. 
C)  1.0% would be hypertonic. 
D)  1.0% would be hypotonic. 
E)  0.1% would be hypertonic.

Exam 4: Membrane Structure and Function

Compare and contrast exocytosis and endocytosis.

Which of the following is not true regarding active transport?

Which statement is false concerning movement of molecules across the cell membrane?

Kidney dialysis relies on diffusion of various dissolved waste molecules (solutes)across a non-living semipermeable membrane.If the concentration of solutes in the blood increases over time before dialysis is administered,what will happen to the rate of dialysis when it occurs?

What property of phospholipids make them suitable for the formation of the double layer found in membranes?

What will happen to dye crystals if placed in the bottom of a beaker of water over a long period of time?

Osmosis can occur when a membrane is

If you have a 10% sugar solution and a 35% sugar solution how does the 10% solution compare to the 35% solution?

Explain the difference between peripheral proteins and integral proteins as they relate to the cell membrane.

Which of the following molecules add stiffness and strength to the plasma membrane?

The definition of osmosis is the

In the Malpighian tubules of an insect (blind,threadlike excretory tubule attached to the gut of an insect),salt molecules are actively transferred from body fluids to the inside of the tubule.Which of the following is NOT true?

When an intestinal cell ingests substances inside very small vesicles that can only be seen with an electron microscope,this is

A cell placed in a hypotonic solution will

Which of the following factors could cause the cell membrane to become less permeable?

Red blood cells come in many blood types including A,B,AB and type O (lacking proteins A and B),Rh positive,Rh negative (lacking Rh+),and many others.If blood is transfused,the recipient detects any new or foreign proteins.The blood type proteins are

Proteins do NOT pass through cell membranes because

A differentially permeable membrane separates a molasses solution from distilled water.Over time,the

The extracellular matrix is responsible for which of the following features?

If 0.9% NaCl were isotonic to a cell,then

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