Question 1

Which is a correct association of protein types?

Accepted Answer

A)  carrier proteins-provide a channel for substances to move across a membrane
B)  cell recognition proteins-allow a specific molecule to bind to it and may cause a cell response
C)  channel proteins-combine with a substance to help it move across a membrane
D)  receptor proteins-variations in these proteins cause tissue transplant rejection
E)  enzymatic proteins-carry out metabolic reactions directlyF) B) and E)
G) C) and E)

Question 2

Receptor-mediated endocytosis involves all of the following EXCEPT

Accepted Answer

A)  receptor proteins to bind to specific molecules.
B)  a coated pit due to a layer of fibrous protein on the cytoplasmic side of the membrane.
C)  various outcomes from destruction of the vesicle to restoration of the surface configuration.
D)  the mechanism for regulating exchange between a mother and fetus.
E)  secretion of materials from a cell.F) A) and D)
G) A) and C)

Question 3

Which membrane transport process can continue whether the cell is alive or dead?

Accepted Answer

A)  sodium/potassium pump
B)  pinocytosis
C)  phagocytosis
D)  exocytosis
E)  diffusionF) B) and C)
G) A) and E)

Question 4

Radioactive isotopes are used to tag proteins in the cell membranes of mouse cells.These cells are then fused with human cells in cultures.What is the likely outcome of the tagged mouse proteins?

Accepted Answer

A)  The tagged proteins remain in the mouse cells and keep their position on the membrane.
B)  The tagged proteins remain in mouse cells but move anywhere across the mouse cell membrane.
C)  The tagged proteins drift across cell membranes and are soon found dispersed across both human and mouse cell membranes.
D)  None of the answer choices will occur since mouse cell membranes are unlike human cell membranes.
E)  None of the answer choices will occur since radioactive cells will soon die.F) A) and B)
G) A) and C) C

Question 5

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 cellsF) A) and D)
G) A) and E)

Question 6

According to the fluid-mosaic model of membrane structure,

Accepted Answer

A)  proteins make up the bulk of the membrane.
B)  only lipids are found in the membrane.
C)  cholesterol is the main constituent of the membrane.
D)  glycolipids form a mosaic pattern inside the cell.
E)  proteins float inside or within the phospholipid bilayer.F) B) and D)
G) B) and C)

Question 7

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.F) A) and D)
G) C) and E)

Question 8

When you add sugar to your coffee or tea,the sugar is the

Accepted Answer

A)  permeable.
B)  solvent.
C)  gradient.
D)  solution.
E)  solute.F) B) and E)
G) None of the above

Question 9

Which type of membrane protein will be used to bind to hormones?

Accepted Answer

A)  channel proteins
B)  carrier proteins
C)  cell recognition proteins
D)  receptor proteins
E)  enzymatic proteinsF) A) and E)
G) A) and D)

Question 10

How can marine animals such as sharks live in salt water?

Accepted Answer

A)  They increase or decrease the amount of urea in their blood until the blood is isotonic with the environment.
B)  They increase the amount of urea in their blood until the blood is hypertonic with the environment.
C)  They decrease the amount of urea in their blood until the blood is hypotonic with the environment.
D)  They contain impermeable membranes which do not allow the salt water to cross into their cells.
E)  They block the movement of salt into their cells and maintain a constant blood salt concentration.F) A) and D)
G) All of the above A

Question 11

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

Accepted Answer

A)  All of the answer choices are performed by the extracellular matrix.
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.F) A) and D)
G) B) and E)

Question 12

In the new procedures developed to clone a mammalian cell,the nucleus is removed from an egg cell and the nucleus from the adult to be cloned is injected inside this cell.If we did this process with a basketball,we would permanently damage the shell.What property of the cell repairs this damage?

Accepted Answer

A)  diffusion of cell membrane proteins
B)  carrier proteins restore the membrane lipids
C)  isotonic solutions
D)  the outer and inner sides of the plasma membrane have identical carbohydrate chains
E)  the fluid-mosaic nature of the membraneF) A) and B)
G) C) and D)

Question 13

Osmosis can occur when a membrane is

Accepted Answer

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

Question 14

Oxygen leaves the alveoli in the lungs and enters the capillaries by endocytosis.

Accepted Answer

A) True 
 B)False

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)  f 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 the answer choices would cause the cell membrane to become less permeable.F) A) and D)
G) A) and E)

Question 16

Which of the following is not a function of the cell membrane?

Accepted Answer

A)  It provides mechanical strength to the cell.
B)  It gives shape to the cell.
C)  It regulates passage of molecules into and out of the cell.
D)  It is largely responsible for cellular homeostasis.
E)  It serves as a site for protein synthesis.F) B) and D)
G) B) and C)

Question 17

If a molecule crosses a plasma membrane faster than it diffuses in water,then the process is likely to involve active transport.

Accepted Answer

A) True 
 B)False

Question 18

Which cell junctions are commonly found in areas that are subject to stretching,such as the skin?

Accepted Answer

A)  adhesion junctions
B)  gap junctions
C)  tight junctions
D)  plasmodesmata
E)  None of the answer choices is found between skin cells.F) A) and E)
G) B) and E)

Question 19

Compare and contrast exocytosis and endocytosis.

Accepted Answer

Both processes require the input of ener...

Question 20

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)  hypertonicF) A) and D)
G) B) and E)

Exam 4: Membrane Structure and Function

Which is a correct association of protein types?

Correct AnswerverifiedShow Answer

Receptor-mediated endocytosis involves all of the following EXCEPT

Correct AnswerverifiedShow Answer

Which membrane transport process can continue whether the cell is alive or dead?

Correct AnswerverifiedShow Answer

Radioactive isotopes are used to tag proteins in the cell membranes of mouse cells.These cells are then fused with human cells in cultures.What is the likely outcome of the tagged mouse proteins?

Correct AnswerverifiedC

Which of the following is not true regarding active transport?

Correct AnswerverifiedShow Answer

According to the fluid-mosaic model of membrane structure,

Correct AnswerverifiedShow Answer

Proteins do NOT pass through cell membranes because

Correct AnswerverifiedShow Answer

When you add sugar to your coffee or tea,the sugar is the

Correct AnswerverifiedShow Answer

Which type of membrane protein will be used to bind to hormones?

Correct AnswerverifiedShow Answer

How can marine animals such as sharks live in salt water?

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

In the new procedures developed to clone a mammalian cell,the nucleus is removed from an egg cell and the nucleus from the adult to be cloned is injected inside this cell.If we did this process with a basketball,we would permanently damage the shell.What property of the cell repairs this damage?

Correct AnswerverifiedShow Answer

Osmosis can occur when a membrane is

Correct AnswerverifiedB

Oxygen leaves the alveoli in the lungs and enters the capillaries by endocytosis.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is not a function of the cell membrane?

Correct AnswerverifiedShow Answer

If a molecule crosses a plasma membrane faster than it diffuses in water,then the process is likely to involve active transport.

Correct AnswerverifiedShow Answer

Which cell junctions are commonly found in areas that are subject to stretching,such as the skin?

Correct AnswerverifiedShow Answer

Compare and contrast exocytosis and endocytosis.

Correct AnswerverifiedBoth processes require the input of ener...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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C

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A

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B

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Both processes require the input of ener...
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