Question 1

Which of the following refers to materials only leaving the cell?

Accepted Answer

A)   diffusion
B)   exocytosis
C)   endocytosis
D)   pinocytosis
E)   phagocytosisF) A) and E)
G) B) and E)

Question 2

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) D) and E)
G) B) and C)

Question 3

Compare and contrast exocytosis and endocytosis.

Accepted Answer

Both processes require the input of ener...

Question 4

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 5

When a substance moves from an area of low concentration to an area of high concentration while using energy, the process is termed

Accepted Answer

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

Question 6

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. This transfer of salt molecules would result in

Accepted Answer

A)   water being "pulled" by osmosis into the Malpighian tubule.
B)   an increase in the salt concentration of the body fluids.
C)   an increase in the water concentration of the body fluids.
D)   the Malpighian tubules becoming isotonic to the body fluids.
E)   the tubules becoming hypotonic to the body fluids.F) A) and D)
G) C) and D)

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 B)
G) C) and D)

Question 8

Which components of a cell membrane are used for cell-to-cell recognition?

Accepted Answer

A)   phospholipids
B)   channel proteins
C)   glycolipids
D)   glycoproteins
E)   cholesterol moleculesF) C) and E)
G) All of the above

Question 9

If 0.9% NaCl were isotonic to a cell, then

Accepted Answer

A)   the cell would burst in a 0.9% solution.
B)   the cell would shrink in a 0.9% solution.
C)   1.0% would be hypertonic to the cell.
D)   1.0% would be hypotonic to the cell.
E)   The cell would shrink in a 0.1% solution.F) A) and B)
G) A) and C)

Question 10

Dead plants seen alongside a salted roadway died because the salt solution caused the cells to

Accepted Answer

A)   undergo crenation.
B)   undergo lysis.
C)   undergo hemolysis.
D)   undergo plasmolysis.
E)   not have an effect on the plants.F) D) and E)
G) None of the above

Question 11

In the emergency room, saline solutions are often run into a person's vein. The saline solution must be

Accepted Answer

A)   0.1% NaCl.
B)   0.5% NaCl.
C)   0.75% NaCl.
D)   0.9% NaCl.
E)   9.0% NaCl.F) C) and D)
G) B) and C)

Question 12

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) None of the above
G) A) and E)

Question 13

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) C) and D)
G) D) and E)

Question 14

Which is true of facilitated transport by carrier proteins?

Accepted Answer

A)   Facilitated transport only applies to small, lipid-soluble molecules.
B)   It is represented by the glucose carrier that can transport hundreds of molecules a second.
C)   After a carrier has transported a molecule, it is unable to transport any more.
D)   Facilitated transport requires expenditure of chemical energy and is therefore active transport.
E)   One carrier protein can carry a variety of different molecules.F) B) and D)
G) B) and C)

Question 15

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

Accepted Answer

Peripheral proteins are associated with ...

Question 16

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

Accepted Answer

A)   The extracellular matrix helps the cell resist stretching.
B)   The extracellular matrix enables the cell to adhere to neighboring cells.
C)   The extracellular matrix plays a role in cell signaling.
D)   The extracellular matrix acts as a structural feature.
E)   All of the answer choices are correct.F) A) and C)
G) B) and E)

Question 17

A semipermeable membrane sac filled with water and large molecules of starch is suspended in a beaker of distilled water. What will happen?

Accepted Answer

A)   The starch will leave and the water will enter until both sides reach equal concentrations.
B)   Water will enter the sac and it will swell.
C)   Because the starch cannot leave, the water cannot enter.
D)   We cannot determine the outcome unless we know the tonicity of the solutions.
E)   The starch will leave the sac and it will shrink.F) B) and C)
G) B) and D)

Question 18

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.F) B) and E)
G) B) and D)

Question 19

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) D) and E)
G) C) and D)

Question 20

Which type of membrane protein will bind to hormones?

Accepted Answer

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

Exam 4: Membrane Structure and Function

According to the fluid-mosaic model of membrane structure

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Proteins do not pass through cell membranes because

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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

If 0.9% NaCl were isotonic to a cell, then

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Which type of membrane protein will bind to hormones?

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Which of the following refers to materials only leaving the cell?

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Which components of a cell membrane are used for cell-to-cell recognition?

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Compare and contrast exocytosis and endocytosis.

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

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. This transfer of salt molecules would result in

Correct AnswerverifiedShow Answer

In the emergency room, saline solutions are often run into a person's vein. The saline solution must be

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A semipermeable membrane sac filled with water and large molecules of starch is suspended in a beaker of distilled water. What will happen?

Correct AnswerverifiedShow Answer

Dead plants seen alongside a salted roadway died because the salt solution caused the cells to

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which is true of facilitated transport by carrier proteins?

Correct AnswerverifiedShow Answer

When a substance moves from an area of low concentration to an area of high concentration while using energy, the process is termed

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

Correct AnswerverifiedPeripheral proteins are associated with ...View AnswerShow Answer

Which is a correct association of protein types?

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

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

Correct AnswerverifiedShow Answer

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Both processes require the input of ener...
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Peripheral proteins are associated with ...
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