Question 1

The plasma membrane

Accepted Answer

A)   is not permeable.
B)   regulates movement of materials into and out of the cell.
C)   has a single layer of phospholipids.
D)   is a rigid protein membrane.
E)   separates the nucleus from the rest of the cell.F) C) and E)
G) B) and D)

Question 2

The movement of molecules against their concentration gradient is called

Accepted Answer

A)   facilitated diffusion.
B)   active transport.
C)   diffusion.
D)   endocytosis.
E)   osmosis.F) None of the above
G) B) and D)

Question 3

Cells of the small intestine and kidney tubules have extensions that increase their surface area called

Accepted Answer

A)   cilia.
B)   hairs.
C)   flagella.
D)   microvilli.
E)   ruguae.F) None of the above
G) D) and E)

Question 4

Membrane-bound receptors

Accepted Answer

A)   are small, lipid soluble molecules.
B)   have no effect on the cell.
C)   do not exhibit specificity.
D)   have their receptor sites on the outer surface of the plasma membrane.
E)   can interact with DNA in the nucleus.F) A) and B)
G) A) and D)

Question 5

Cells that lack ribosomes cannot

Accepted Answer

A)   eliminate wastes.
B)   produce energy.
C)   package cellular products.
D)   engage in protein synthesis.
E)   ingest and phagocytize bacteria.F) A) and C)
G) D) and E)

Question 6

Which of the following is CORRECTLY matched with its function?

Accepted Answer

A)   peripheral proteins - penetrate the lipid bilayer from one surface to the other
B)   nongated ion channels - are always closed
C)   receptor proteins - attach to ligand molecules
D)   channel proteins - are part of an intercellular communication system
E)   marker molecules - are primarily steroidsF) B) and D)
G) B) and C)

Question 7

Channel proteins

Accepted Answer

A)   allow cells to recognize one another.
B)   are binding sites for other molecules.
C)   utilize the G protein complex to function.
D)   are found only on endoplasmic reticulum.
E)   provide a tunnel through which ions or molecules can enter or leave the cell.F) B) and C)
G) C) and D)

Question 8

When a person trains for running long distances, which of the following organelles increase in his/her muscles?

Accepted Answer

A)   mitochondria
B)   lysosomes
C)   enzymes for glycolysis
D)   basal bodies
E)   rough endoplasmic reticulumF) All of the above
G) A) and B)

Question 9

Which of the following is NOT a G-protein complex protein?

Accepted Answer

A)   delta
B)   gamma
C)   alpha
D)   beta
E)   None of these choices are correct.F) A) and E)
G) D) and E)

Question 10

What type of cell would have an abundance of peroxisomes?

Accepted Answer

A)   mucus cell (secretes mucus) 
B)   cardiac muscle cells (require large amounts of ATP) 
C)   white blood cell, a phagocyte
D)   fibroblast (makes protein fibers) 
E)   liver cells that detoxify hydrogen peroxideF) A) and C)
G) B) and C)

Question 11

The fluid-mosaic model of the plasma membrane suggests that

Accepted Answer

A)   phospholipids form a single lipid layer in the center of the membrane.
B)   proteins form a "liquid" sea in the membrane.
C)   cholesterol forms the outermost layer of the membrane.
D)   the membrane is neither rigid nor static in structure.
E)   proteins are not a part of the membrane.F) A) and B)
G) B) and E)

Question 12

Molecules that serve as chemical signals to open or close gated ion channels are

Accepted Answer

A)   responders.
B)   ligands.
C)   isotopes.
D)   communicators.
E)   membrane potentials.F) A) and B)
G) B) and D)

Question 13

What type of cell has abundant ribosomes?

Accepted Answer

A)   cardiac muscle cells (require large amounts of ATP) 
B)   white blood cell, a phagocyte
C)   fibroblast (makes protein fibers) 
D)   red blood cell (transports oxygen) 
E)   liver cells that detoxify hydrogen peroxideF) A) and D)
G) All of the above

Question 14

Which of the following are ciliated cells?

Accepted Answer

A)   red blood cells
B)   macrophage (large, mobile white blood cell) 
C)   spermatozoa
D)   columnar cells of upper respiratory tract
E)   columnar cells of small intestinesF) A) and C)
G) A) and B)

Question 15

Organelles

Accepted Answer

A)   are unspecialized portions of a cell.
B)   are extracellular structures.
C)   vary in number and type depending on cell function.
D)   are structural, but not functional parts of the cell.
E)   generally lack membranes.F) A) and B)
G) All of the above

Question 16

Which of the following would increase the maximum rate of facilitated diffusion?

Accepted Answer

A)   increase the concentration gradient of the transported molecule to the saturation point
B)   decrease the concentration gradient of the transported molecule
C)   increase the concentration of the competitive molecules
D)   increased ATP synthesis
E)   None of these choices is correct.F) None of the above
G) B) and D)

Question 17

In the process of diffusion, net movement of substances is always from a region

Accepted Answer

A)   outside the cell to a region inside the cell.
B)   inside the cell to a region outside the cell.
C)   of lower concentration to a region of higher concentration.
D)   of higher concentration to a region of lower concentration.
E)   None of these choices are correct.F) A) and C)
G) C) and E)

Question 18

A cell can meet increased energy demands by an increase in

Accepted Answer

A)   ribosomal subunits.
B)   the number of mitochondria.
C)   nuclear DNA activity.
D)   its overall size so it has more room to generate energy.
E)   lysosomal enzyme and ribosome activity within the cell.F) A) and B)
G) A) and E)

Question 19

The anticodon sequence GUA pairs with which of the following codons?

Accepted Answer

A)   CAU
B)   CAT
C)   CTU
D)   CTT
E)   GUAF) B) and E)
G) B) and C)

Question 20

Arrange the following events of exocytosis in the correct sequence: (1)  vesicle membrane fuses with plasma membrane
(2)  secretory vesicles migrate to plasma membrane
(3)  vesicle contents are expelled from cell
(4)  secretions accumulate within secretory vesicles

Accepted Answer

A)   1, 4, 2, 3
B)   2, 1, 4, 3
C)   1, 2, 3, 4
D)   4, 2, 1, 3
E)   3, 1, 4, 2F) A) and D)
G) C) and D)

Exam 3: Cell Biology

Which of the following is NOT a G-protein complex protein?

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The plasma membrane

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What type of cell would have an abundance of peroxisomes?

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Which of the following are ciliated cells?

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Which of the following is CORRECTLY matched with its function?

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Which of the following would increase the maximum rate of facilitated diffusion?

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The fluid-mosaic model of the plasma membrane suggests that

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Cells that lack ribosomes cannot

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Arrange the following events of exocytosis in the correct sequence: (1) vesicle membrane fuses with plasma membrane (2) secretory vesicles migrate to plasma membrane (3) vesicle contents are expelled from cell (4) secretions accumulate within secretory vesicles

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When a person trains for running long distances, which of the following organelles increase in his/her muscles?

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Membrane-bound receptors

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What type of cell has abundant ribosomes?

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The anticodon sequence GUA pairs with which of the following codons?

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Channel proteins

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A cell can meet increased energy demands by an increase in

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Organelles

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The movement of molecules against their concentration gradient is called

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Molecules that serve as chemical signals to open or close gated ion channels are

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In the process of diffusion, net movement of substances is always from a region

Correct AnswerverifiedShow Answer

Cells of the small intestine and kidney tubules have extensions that increase their surface area called

Correct AnswerverifiedShow Answer

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