Question 1

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. B

Question 2

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. 
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. A

Question 3

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. 
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. C

Question 4

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 membrane 
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 membrane

Question 5

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 6

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. 
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.

Question 7

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

Question 8

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. 
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.

Question 9

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 10

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. 
A) permeable. 
B) solvent. 
C) gradient. 
D) solution. 
E) solute.

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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 13

Compare and contrast exocytosis and endocytosis.

Accepted Answer

Both processes require the input of ener

Question 14

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. 
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.

Question 15

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. 
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.

Question 16

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 17

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

Question 18

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) diffusion 
A) sodium/potassium pump 
B) pinocytosis 
C) phagocytosis 
D) exocytosis 
E) diffusion

Question 19

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. 
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.

Question 20

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 directly 
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 directly

Exam 4: Membrane Structure and Function

Osmosis can occur when a membrane is

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

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?

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?

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

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

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

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

Which of the following is not true regarding active transport?

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

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

Proteins do NOT pass through cell membranes because

Compare and contrast exocytosis and endocytosis.

According to the fluid-mosaic model of membrane structure,

Receptor-mediated endocytosis involves all of the following EXCEPT

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

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

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

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

Which is a correct association of protein types?

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