Question 1

Which cell organelle helps pinocytosis and phagocytosis to occur?

Accepted Answer

A)   the endoplasmic reticulum
B)   the lysosome
C)   the plasma membrane
D)   the nucleusE) All of the above
F) A) and B)

Question 2

Identify the structures indicated in this drawing of a typical plasma membrane. 
-microfilament

Accepted Answer

The answer of Identify the structures indicated in this drawing...

Question 3

Suppose that you fuse a mouse cell and a human cell, and then treats the cell with specific antibodies covalently linked to fluorescent dyes (antibodies linked to mouse proteins are green; antibodies linked to human proteins are red) . What will the cell look like immediately after labelling?

Accepted Answer

A)   The red and green fluorescent labels will be uniformly distributed across the entire membrane of the cell.
B)   The cell will be half red and half green.
C)   The red and green labels will be distributed in the cell in intermingled patches.
D)   The red and green labels will flash in the cell intermittently.E) None of the above
F) A) and C)

Question 4

What do we mean when we say that facilitated diffusion is specific?

Accepted Answer

A)   A protein will transport specific molecules.
B)   One specific integral protein per membrane is involved in facilitated diffusion.
C)   Only specific hydrophobic molecules can be transported.
D)   The energy molecule ATP is specifically required for transport.E) A) and C)
F) B) and D)

Question 5

What are the major structural components of a cell membrane?

Accepted Answer

A)   glycolipids and cellulose
B)   glycolipids and proteins
C)   phospholipids and cellulose
D)   phospholipids and proteinsE) B) and D)
F) None of the above

Question 6

Match each mechanism of cellular transport with its correct definition.
-facilitated diffusion

Accepted Answer

A)  movement of a molecule from an area of high concentration to an area of lower concentration
B)  cells internalize molecules into a cell by the inward budding of vesicles possessing receptors specific to the molecule being transported
C)  movement of water from a hypotonic solution into a hypertonic solution across a selectively permeable membrane
D)  large particles are enveloped by the cell membrane and internalized
E)  a process in which liquid droplets are ingested by living cellsF) diffusion of molecules across the plasma membrane with the assistance of transport proteinsG) C) and D)
H) B) and D)

Question 7

A hypertonic environment would be ideal for a healthy plant.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is created as ions diffuse across membranes?

Accepted Answer

A)   an electrical gradient
B)   a chemical gradient
C)   an electrochemical gradient
D)   a biochemical gradientE) None of the above
F) All of the above C

Question 9

Explain why the transport of molecules across the cell membrane is considered to be both specific and directional.

Accepted Answer

Transport is considered directional because only certain ions and molecules can move into the cell, while others can move only out of the cell. Transport is specific because only certain ions and molecules can actually move across the membrane.

Question 10

Match each mechanism of cellular transport with its correct definition.
-osmosis

Accepted Answer

A)  movement of a molecule from an area of high concentration to an area of lower concentration
B)  cells internalize molecules into a cell by the inward budding of vesicles possessing receptors specific to the molecule being transported
C)  movement of water from a hypotonic solution into a hypertonic solution across a selectively permeable membrane
D)  large particles are enveloped by the cell membrane and internalized
E)  a process in which liquid droplets are ingested by living cellsF) diffusion of molecules across the plasma membrane with the assistance of transport proteinsG) A) and F)
H) B) and D)

Question 11

Which of the following is a function of the sterols that are found in animal cell membranes?

Accepted Answer

A)   They maintain membrane fluidity.
B)   They facilitate ion transport.
C)   They store cellular energy.
D)   They increase the rate of diffusion.E) C) and D)
F) B) and D) A

Question 12

Suppose that you fuse a mouse cell and a human cell, and then treat the cell with specific antibodies covalently linked to fluorescent dyes (antibodies linked to mouse proteins are green; antibodies linked to human proteins are red) . Forty minutes later, you look at the fused cell. Which of the following will you observe?

Accepted Answer

A)   The red and green labels will be distributed in intermingled patches.
B)   The red and green labels will flash intermittently.
C)   The red and green labels will be uniformly distributed across the entire membrane.
D)   The cell will be half red and half green.E) All of the above
F) None of the above

Question 13

These micrographs of animal cells depict the effects of various aqueous environments on red blood cells placed in a hypotonic, hypertonic, or isotonic environment. Match each term to a micrograph.  ©1976 The Rockefeller University Press. The Journal of Cell Biology, 1976, 70:193-203. doi: 10.1083/jcb.70.1.1
-hypotonic

Accepted Answer

The answer of These micrographs of animal cells depict the...

Question 14

What is the primary function of a cell membrane?

Accepted Answer

A)   recognizing other cells as being "like"
B)   controlling the transport of substances into and out of cells
C)   recognizing chemical signals from other cells
D)   cell-cell bindingE) All of the above
F) A) and C)

Question 15

How are exocytosis and endocytosis similar to each other?

Accepted Answer

A)   They both transport large molecules.
B)   They both transport materials into cells.
C)   They both transport materials out of cells.
D)   They both transport small molecules.E) A) and B)
F) A) and C)

Question 16

What does the "mosaic" part of the fluid mosaic model refer to?

Accepted Answer

A)   the membrane cholesterol
B)   the membrane functions
C)   the membrane proteins
D)   the membrane phospholipidsE) A) and B)
F) A) and C)

Question 17

Cells must constantly bring in certain molecules and ions while keeping others out. What part of the cell accomplishes this function?

Accepted Answer

A)   the plasma membrane
B)   the vesicles
C)   the nucleus
D)   the lysosomesE) A) and B)
F) B) and C)

Question 18

Which term refers to the movement of a substance from an area of low concentration to an area of high concentration using energy obtained from ATP?

Accepted Answer

A)   passive transport
B)   facilitated transport
C)   active transport
D)   osmosisE) A) and B)
F) A) and D)

Question 19

Water is a strongly polar molecule, so how does it cross the plasma membrane?

Accepted Answer

Water molecules are small enough to slip...

Question 20

Which statement applies to facilitated diffusion?

Accepted Answer

A)   It requires ATP.
B)   It can involve either carrier proteins or channel proteins.
C)   It is nonspecific with respect to the nature of the molecules being transported.
D)   It is not dependent on a concentration gradient.E) B) and C)
F) None of the above

Exam 4: Cell Membranes and Signaling

Which cell organelle helps pinocytosis and phagocytosis to occur?

Correct Answer
verified

Identify the structures indicated in this drawing of a typical plasma membrane. -microfilament

Correct Answer
verified

Suppose that you fuse a mouse cell and a human cell, and then treats the cell with specific antibodies covalently linked to fluorescent dyes (antibodies linked to mouse proteins are green; antibodies linked to human proteins are red) . What will the cell look like immediately after labelling?

Correct Answer
verified

What do we mean when we say that facilitated diffusion is specific?

Correct Answer
verified

What are the major structural components of a cell membrane?

Correct Answer
verified

Match each mechanism of cellular transport with its correct definition. -facilitated diffusion

Correct Answer
verified

A hypertonic environment would be ideal for a healthy plant.

Correct Answer
verified

Which of the following is created as ions diffuse across membranes?

Correct Answer
verified
C

Explain why the transport of molecules across the cell membrane is considered to be both specific and directional.

Correct Answer
verified
Transport is considered directional because only certain ions and molecules can move into the cell, while others can move only out of the cell. Transport is specific because only certain ions and molecules can actually move across the membrane.

Match each mechanism of cellular transport with its correct definition. -osmosis

Correct Answer
verified

Which of the following is a function of the sterols that are found in animal cell membranes?

Correct Answer
verified
A

Correct Answer
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Correct Answer
verified

What is the primary function of a cell membrane?

Correct Answer
verified

How are exocytosis and endocytosis similar to each other?

Correct Answer
verified

What does the "mosaic" part of the fluid mosaic model refer to?

Correct Answer
verified

Cells must constantly bring in certain molecules and ions while keeping others out. What part of the cell accomplishes this function?

Correct Answer
verified

Which term refers to the movement of a substance from an area of low concentration to an area of high concentration using energy obtained from ATP?

Correct Answer
verified

Water is a strongly polar molecule, so how does it cross the plasma membrane?

Correct Answer
verified
Water molecules are small enough to slip...
View Answer

Which statement applies to facilitated diffusion?

Correct Answer
verified

Exam 4: Cell Membranes and Signaling

Which cell organelle helps pinocytosis and phagocytosis to occur?

Correct AnswerverifiedShow Answer

Identify the structures indicated in this drawing of a typical plasma membrane. -microfilament

Correct AnswerverifiedShow Answer

Suppose that you fuse a mouse cell and a human cell, and then treats the cell with specific antibodies covalently linked to fluorescent dyes (antibodies linked to mouse proteins are green; antibodies linked to human proteins are red) . What will the cell look like immediately after labelling?

Correct AnswerverifiedShow Answer

What do we mean when we say that facilitated diffusion is specific?

Correct AnswerverifiedShow Answer

What are the major structural components of a cell membrane?

Correct AnswerverifiedShow Answer

Match each mechanism of cellular transport with its correct definition. -facilitated diffusion

Correct AnswerverifiedShow Answer

A hypertonic environment would be ideal for a healthy plant.

Correct AnswerverifiedShow Answer

Which of the following is created as ions diffuse across membranes?

Correct AnswerverifiedC

Explain why the transport of molecules across the cell membrane is considered to be both specific and directional.

Correct AnswerverifiedTransport is considered directional because only certain ions and molecules can move into the cell, while others can move only out of the cell. Transport is specific because only certain ions and molecules can actually move across the membrane.

Match each mechanism of cellular transport with its correct definition. -osmosis

Correct AnswerverifiedShow Answer

Which of the following is a function of the sterols that are found in animal cell membranes?

Correct AnswerverifiedA

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the primary function of a cell membrane?

Correct AnswerverifiedShow Answer

How are exocytosis and endocytosis similar to each other?

Correct AnswerverifiedShow Answer

What does the "mosaic" part of the fluid mosaic model refer to?

Correct AnswerverifiedShow Answer

Cells must constantly bring in certain molecules and ions while keeping others out. What part of the cell accomplishes this function?

Correct AnswerverifiedShow Answer

Which term refers to the movement of a substance from an area of low concentration to an area of high concentration using energy obtained from ATP?

Correct AnswerverifiedShow Answer

Water is a strongly polar molecule, so how does it cross the plasma membrane?

Correct AnswerverifiedWater molecules are small enough to slip...View AnswerShow Answer

Which statement applies to facilitated diffusion?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified
Transport is considered directional because only certain ions and molecules can move into the cell, while others can move only out of the cell. Transport is specific because only certain ions and molecules can actually move across the membrane.

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Water molecules are small enough to slip...
View Answer

Correct Answer
verified