Question 1

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. 
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.

Question 2

If the proteins forming the cell junctions within the stomach were denatured,what is a likely consequence?

Accepted Answer

A) The desmosome junctions would not hold together,causing the cells in the stomach to pull apart. 
B) The tight junctions would not hold together,causing the cells in the stomach to pull apart. 
C) The desmosome junctions would be bonded together more tightly,causing the cells in the stomach to form a solid barrier. 
D) The gap junctions would not hold together,causing the cells in the stomach to be unable to pass ions back and forth. 
E) The desmosome junctions would not hold together,causing the cells in the kidney to pull apart. 
A) The desmosome junctions would not hold together,causing the cells in the stomach to pull apart. 
B) The tight junctions would not hold together,causing the cells in the stomach to pull apart. 
C) The desmosome junctions would be bonded together more tightly,causing the cells in the stomach to form a solid barrier. 
D) The gap junctions would not hold together,causing the cells in the stomach to be unable to pass ions back and forth. 
E) The desmosome junctions would not hold together,causing the cells in the kidney to pull apart.

Question 3

Exocytosis is carried out by proteins in the cell membrane.

Accepted Answer

A) True 
 B)False

Question 4

Which function does the lipid bilayer component of the plasma membrane NOT provide for the cell?

Accepted Answer

A) defines a permeable boundary between the organized interior and the chaotic external environment 
B) provides an impermeable,self-sealing membrane that keeps all internal living processes sealed inside 
C) controls the exchange of molecules between one cell and adjacent cells or the environment 
D) provides a fluid and flexible boundary that insulates the interior from the variations in humidity,food,and other external conditions 
E) provides a matrix for the placement of proteins that regulate the exchange of molecules between the inside and outside of the cell 
A) defines a permeable boundary between the organized interior and the chaotic external environment 
B) provides an impermeable,self-sealing membrane that keeps all internal living processes sealed inside 
C) controls the exchange of molecules between one cell and adjacent cells or the environment 
D) provides a fluid and flexible boundary that insulates the interior from the variations in humidity,food,and other external conditions 
E) provides a matrix for the placement of proteins that regulate the exchange of molecules between the inside and outside of the cell

Question 5

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.Which of the following is NOT true?

Accepted Answer

A) Water is also "pulled" by osmosis into the Malpighian tubule. 
B) The concentration of salt is normally higher in the body fluids than it is inside the tubule. 
C) The process decreases the salt concentration of the body fluids. 
D) Insects must excrete excess salt through the Malpighian tubules. 
E) The tubules have the same tonicity as the body fluids. 
A) Water is also "pulled" by osmosis into the Malpighian tubule. 
B) The concentration of salt is normally higher in the body fluids than it is inside the tubule. 
C) The process decreases the salt concentration of the body fluids. 
D) Insects must excrete excess salt through the Malpighian tubules. 
E) The tubules have the same tonicity as the body fluids.

Question 6

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

Question 7

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) the saline solution did not have an effect on the plants. 
A) undergo crenation. 
B) undergo lysis. 
C) undergo hemolysis. 
D) undergo plasmolysis. 
E) the saline solution did not have an effect on the plants.

Question 8

Molecules such as glucose and amino acids are NOT lipid soluble and therefore they

Accepted Answer

A) easily pass across the cell membrane. 
B) require active transport to cross the cell membrane. 
C) must be converted to lipids before they can enter a cell. 
D) combine with carrier proteins and pass across by facilitated transport. 
E) must be engulfed by a cell using endocytosis. 
A) easily pass across the cell membrane. 
B) require active transport to cross the cell membrane. 
C) must be converted to lipids before they can enter a cell. 
D) combine with carrier proteins and pass across by facilitated transport. 
E) must be engulfed by a cell using endocytosis.

Question 9

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

Accepted Answer

Peripheral proteins are associated with

Question 10

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

Accepted Answer

A) diffusion 
B) exocytosis 
C) endocytosis 
D) pinocytosis 
E) phagocytosis 
A) diffusion 
B) exocytosis 
C) endocytosis 
D) pinocytosis 
E) phagocytosis

Question 11

What property of phospholipids makes them suitable for the formation of the double layer found in membranes?

Accepted Answer

A) They are uncharged. 
B) They can interact with proteins. 
C) They are composed of fatty acids. 
D) They have both a hydrophobic and a hydrophilic end. 
E) They serve as an attachment site for carbohydrates. 
A) They are uncharged. 
B) They can interact with proteins. 
C) They are composed of fatty acids. 
D) They have both a hydrophobic and a hydrophilic end. 
E) They serve as an attachment site for carbohydrates.

Question 12

When a plant cell is placed in a hypotonic solution,the cell wall prevents

Accepted Answer

A) diffusion. 
B) active transport. 
C) the cell from bursting. 
D) the cell from shrinking. 
E) water from entering the cell. 
A) diffusion. 
B) active transport. 
C) the cell from bursting. 
D) the cell from shrinking. 
E) water from entering the cell.

Question 13

What two components are commonly found in the extracellular matrix that help resist stretching and provide resilience?

Accepted Answer

A) proteins and polysaccharides 
B) proteins and phospholipids 
C) polysaccharides and phospholipids 
D) amino acids and phospholipids 
E) nucleic acids and proteins 
A) proteins and polysaccharides 
B) proteins and phospholipids 
C) polysaccharides and phospholipids 
D) amino acids and phospholipids 
E) nucleic acids and proteins

Question 14

If a particular molecule is brought into the cell by receptor-medicated endocytosis,then changing the receptors will change the molecule that is being transported.

Accepted Answer

A) True 
 B)False

Exam 4: Membrane Structure and Function

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

If the proteins forming the cell junctions within the stomach were denatured,what is a likely consequence?

Exocytosis is carried out by proteins in the cell membrane.

Which function does the lipid bilayer component of the plasma membrane NOT provide for the cell?

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.Which of the following is NOT true?

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

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

Molecules such as glucose and amino acids are NOT lipid soluble and therefore they

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

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

What property of phospholipids makes them suitable for the formation of the double layer found in membranes?

When a plant cell is placed in a hypotonic solution,the cell wall prevents

What two components are commonly found in the extracellular matrix that help resist stretching and provide resilience?

If a particular molecule is brought into the cell by receptor-medicated endocytosis,then changing the receptors will change the molecule that is being transported.

The Study of Life

The Molecules of Cells

Cell Structure and Function

Cell Division

Metabolism: Energy and Enzymes

Cellular Respiration

Photosynthesis

Plant Organization and Function

Plant Reproduction and Responses

Human Organization

Cardiovascular System

Lymphatic and Immune Systems

Digestive System and Nutrition

Respiratory System

Urinary System and Excretion

Nervous System

Senses

Musculoskeletal System

Endocrine System

Reproductive System

Development and Aging

Patterns of Gene Inheritance

Chromosomal Inheritance and Genetic Disorders

Dna Structure and Control of Gene Expression

Biotechnology and Genomics

Evolution of Life

Viruses, bacteria, and Archaea

Protistans

Plants

Animals: Part I

Animals Part II

Animal Behavior

Population Ecology

Nature of Ecosystems

The Biosphere

Environmental Concerns

Filters