Question 1

Unlike active transport, passive transport across cellular membranes does not require the participation of transport proteins.

Accepted Answer

A) True 
 B)False  False

Question 2

Which of the following is NOT a function of membrane proteins?

Accepted Answer

A)  converting energy from one form to another 
B)  catalyzing chemical reactions 
C)  transporting specific molecules or ions into and out of the cell 
D)  making the membrane impermeable 
E)  acting as receptors for chemical signals 
A)  converting energy from one form to another 
B)  catalyzing chemical reactions 
C)  transporting specific molecules or ions into and out of the cell 
D)  making the membrane impermeable 
E)  acting as receptors for chemical signals D

Question 3

If a plant cell is placed in a solution with a relatively low water potential, the cell will:

Accepted Answer

A)  swell and perhaps burst. 
B)  undergo plasmolysis. 
C)  build up turgor pressure. 
D)  build up wall pressure. 
E)  neither gain nor lose water. 
A)  swell and perhaps burst. 
B)  undergo plasmolysis. 
C)  build up turgor pressure. 
D)  build up wall pressure. 
E)  neither gain nor lose water. B

Question 4

Turgor pressure is particularly important in the support of nonwoody plants.

Accepted Answer

A) True 
 B)False

Question 5

The portion of a transmembrane protein embedded in the bilayer is:

Accepted Answer

A)  hydrophilic. 
B)  hydrophobic. 
C)  a glycoprotein. 
D)  a glycolipid. 
E)  a lectin. 
A)  hydrophilic. 
B)  hydrophobic. 
C)  a glycoprotein. 
D)  a glycolipid. 
E)  a lectin.

Question 6

What is the water potential, expressed in units of megapascals, of pure water?

Accepted Answer

A)  -10 
B)  -5 
C)  0 
D)  10 
E)  20 
A)  -10 
B)  -5 
C)  0 
D)  10 
E)  20

Question 7

The transport of solutes by carrier proteins is faster than that by channel proteins.

Accepted Answer

A) True 
 B)False

Question 8

All the membranes of a cell have the same basic structure.

Accepted Answer

A) True 
 B)False

Question 9

Although membranes were previously described by the "fluid-mosaic" model, recent evidence suggests that membranes:

Accepted Answer

A)  have lipids that are more widely dispersed and not grouped. 
B)  have proteins that are not organized in functional complexes. 
C)  have a smaller proportion of proteins. 
D)  have a more constant thickness. 
E)  are less fluid. 
A)  have lipids that are more widely dispersed and not grouped. 
B)  have proteins that are not organized in functional complexes. 
C)  have a smaller proportion of proteins. 
D)  have a more constant thickness. 
E)  are less fluid.

Question 10

Receptor-mediated endocytosis involves the vesicle-mediated transport of specific molecules.

Accepted Answer

A) True 
 B)False

Question 11

Wilting results most directly from _______ in plant cells.

Accepted Answer

A)  increased metabolism 
B)  malfunctioning contractile vacuoles 
C)  the loss of turgor 
D)  defective osmotic pressure 
E)  defective membranes 
A)  increased metabolism 
B)  malfunctioning contractile vacuoles 
C)  the loss of turgor 
D)  defective osmotic pressure 
E)  defective membranes

Question 12

In the plasma membrane, carbohydrates are most likely to be found:

Accepted Answer

A)  attached to phospholipids in the bilayer. 
B)  attached to cholesterol in the bilayer. 
C)  attached to a desmotubule in the bilayer. 
D)  on the outer membrane surface. 
E)  on the inner membrane surface. 
A)  attached to phospholipids in the bilayer. 
B)  attached to cholesterol in the bilayer. 
C)  attached to a desmotubule in the bilayer. 
D)  on the outer membrane surface. 
E)  on the inner membrane surface.

Question 13

In the plasma membrane, multipass proteins typically span the bilayer as alpha-helices.

Accepted Answer

A) True 
 B)False

Question 14

A cell that ingests bacteria or cellular debris does so by:

Accepted Answer

A)  exocytosis. 
B)  phagocytosis. 
C)  pinocytosis. 
D)  receptor-mediated endocytosis. 
E)  facilitated diffusion. 
A)  exocytosis. 
B)  phagocytosis. 
C)  pinocytosis. 
D)  receptor-mediated endocytosis. 
E)  facilitated diffusion.

Question 15

The rate of osmosis is influenced by the size of the solute particle.

Accepted Answer

A) True 
 B)False

Question 16

The cytoplasmic sleeve is the:

Accepted Answer

A)  cytoplasmic channel involved in symplastic transport through a plasmodesma. 
B)  cytoplasm inside the lumen of a desmotubule. 
C)  cytoplasm in the cortical area of the protoplast. 
D)  cytoplasm inside the endoplasmic reticulum. 
E)  extension of the cytoplasm into the cell wall. 
A)  cytoplasmic channel involved in symplastic transport through a plasmodesma. 
B)  cytoplasm inside the lumen of a desmotubule. 
C)  cytoplasm in the cortical area of the protoplast. 
D)  cytoplasm inside the endoplasmic reticulum. 
E)  extension of the cytoplasm into the cell wall.

Question 17

In receptor-mediated endocytosis, specific receptors for the substances to be transported are localized in:

Accepted Answer

A)  the nucleus. 
B)  Golgi bodies. 
C)  mitochondria. 
D)  the cytoplasm. 
E)  coated pits. 
A)  the nucleus. 
B)  Golgi bodies. 
C)  mitochondria. 
D)  the cytoplasm. 
E)  coated pits.

Question 18

In the active transport of sucrose, the secondary active transport system is the:

Accepted Answer

A)  sucrose-proton symporter. 
B)  H+-ATPase. 
C)  sucrose uniporter. 
D)  proton pump. 
E)  sucrose-proton antiporter. 
A)  sucrose-proton symporter. 
B)  H+-ATPase. 
C)  sucrose uniporter. 
D)  proton pump. 
E)  sucrose-proton antiporter.

Question 19

Which of the following would NOT occur during signal recognition?

Accepted Answer

A)  The signal molecule binds to a specific receptor on the plasma membrane. 
B)  The signal molecule is transported into the cell by endocytosis. 
C)  The signal molecule is transported out of the cell by exocytosis. 
D)  The signal molecule remains outside the cell. 
E)  The signal molecule activates a transmembrane protein. 
A)  The signal molecule binds to a specific receptor on the plasma membrane. 
B)  The signal molecule is transported into the cell by endocytosis. 
C)  The signal molecule is transported out of the cell by exocytosis. 
D)  The signal molecule remains outside the cell. 
E)  The signal molecule activates a transmembrane protein.

Question 20

The inner and outer surfaces of a plasma membrane have the same chemical composition.

Accepted Answer

A) True 
 B)False

Exam 4: The Movement of Substances Into and Out of Cells

Unlike active transport, passive transport across cellular membranes does not require the participation of transport proteins.

Which of the following is NOT a function of membrane proteins?

If a plant cell is placed in a solution with a relatively low water potential, the cell will:

Turgor pressure is particularly important in the support of nonwoody plants.

The portion of a transmembrane protein embedded in the bilayer is:

What is the water potential, expressed in units of megapascals, of pure water?

The transport of solutes by carrier proteins is faster than that by channel proteins.

All the membranes of a cell have the same basic structure.

Although membranes were previously described by the "fluid-mosaic" model, recent evidence suggests that membranes:

Receptor-mediated endocytosis involves the vesicle-mediated transport of specific molecules.

Wilting results most directly from _______ in plant cells.

In the plasma membrane, carbohydrates are most likely to be found:

In the plasma membrane, multipass proteins typically span the bilayer as alpha-helices.

A cell that ingests bacteria or cellular debris does so by:

The rate of osmosis is influenced by the size of the solute particle.

The cytoplasmic sleeve is the:

In receptor-mediated endocytosis, specific receptors for the substances to be transported are localized in:

In the active transport of sucrose, the secondary active transport system is the:

Which of the following would NOT occur during signal recognition?

The inner and outer surfaces of a plasma membrane have the same chemical composition.

Botany: an Introduction

The Molecular Composition of Plant Cells

The Plant Cell and the Cell Cycle

The Flow of Energy

Respiration

Photosynthesis, Light, and Life

Sexual Reproduction and Heredity

The Chemistry of Heredity and Gene Expression

Recombinant Dna Technology, Plant Biotechnology, and Genomics

The Process of Evolution

Systematics: the Science of Biological Diversity

Prokaryotes and Viruses

Fungi

Protists: Algae and Heterotrophic Protists

Bryophytes

Seedless Vascular Plants

Gymnosperms

Introduction to the Angiosperms

Evolution of the Angiosperms

Plants and People

Early Development of the Plant Body

Cells and Tissues of the Plant Body

The Root: Structure and Development

The Shoot: Primary Structure and Development

Secondary Growth in Stems

Regulating Growth and Development: the Plant Hormones

External Factors and Plant Growth

Plant Nutrition and Soils

The Movement of Water and Solutes in Plants

The Dynamics of Communities and Ecosystems

Global Ecology

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