Question 1

Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane.

Accepted Answer

A) True 
 B)False

Question 2

The newly discovered membrane channel protein that accounts for why water can cross a membrane more quickly than expected is:

Accepted Answer

A) ATP synthetase 
B) Aquaporin 
C) The sodium-potassium pump 
D) Integrin 
A) ATP synthetase 
B) Aquaporin 
C) The sodium-potassium pump 
D) Integrin

Question 3

In a phospholipid bilayer,the

Accepted Answer

A) phosphate groups are hydrophobic. 
B) fatty acid tails are ionized. 
C) fatty acid tails are hydrophilic. 
D) proteins are located only between the two layers. 
E) phosphate heads are oriented toward the exterior of the cell or toward the cytoplasm. 
A) phosphate groups are hydrophobic. 
B) fatty acid tails are ionized. 
C) fatty acid tails are hydrophilic. 
D) proteins are located only between the two layers. 
E) phosphate heads are oriented toward the exterior of the cell or toward the cytoplasm.

Question 4

Study the series of pictures to identify the process as:

Accepted Answer

A) facilitated transport 
B) active transport 
C) passive transport 
D) osmosis 
A) facilitated transport 
B) active transport 
C) passive transport 
D) osmosis

Question 5

Eukaryotic cells are substantially larger than bacterial cells and average over 20 times more volume-per-surface-area than bacterial cells.How can the eukaryotic cell membrane provide this higher rate of exchange of materials?

Accepted Answer

A) Plasma membrane folds increase the surface area. 
B) Carrier proteins speed the rate at which a solute crosses the plasma membrane in the direction of decreasing concentration. 
C) Mitochondria are concentrated near membranes to provide energy for active transport of molecules or ions. 
D) Large molecules are engulfed by vesicle formation. 
E) All of the choices are correct. 
A) Plasma membrane folds increase the surface area. 
B) Carrier proteins speed the rate at which a solute crosses the plasma membrane in the direction of decreasing concentration. 
C) Mitochondria are concentrated near membranes to provide energy for active transport of molecules or ions. 
D) Large molecules are engulfed by vesicle formation. 
E) All of the choices are correct.

Question 6

Which cell junction is unique to animals.

Accepted Answer

A) gap 
B) tight 
C) desmosomes 
D) all are unique to animals 
A) gap 
B) tight 
C) desmosomes 
D) all are unique to animals

Question 7

Which is the best definition of active transport?

Accepted Answer

A) movement of molecules from an area of their higher concentration to an area of their lower concentration 
B) movement of water across a semi permeable membrane from an area of higher water concentration to an area of lower water concentration 
C) movement of molecules from an area of their lower concentration to an area of their higher concentration 
D) movement of water across a semi permeable membrane from an area of lower water concentration to an area of higher water concentration 
E) movement of a substance against its concentration through the release of energy from ATP 
A) movement of molecules from an area of their higher concentration to an area of their lower concentration 
B) movement of water across a semi permeable membrane from an area of higher water concentration to an area of lower water concentration 
C) movement of molecules from an area of their lower concentration to an area of their higher concentration 
D) movement of water across a semi permeable membrane from an area of lower water concentration to an area of higher water concentration 
E) movement of a substance against its concentration through the release of energy from ATP

Question 8

The process by which cholesterol is transported into the cell by the binding of LDL to its receptor and the internalization of the receptor-LDL complex is

Accepted Answer

A) facilitated transport. 
B) active transport. 
C) cotransport. 
D) endocytosis. 
E) exocytosis. 
A) facilitated transport. 
B) active transport. 
C) cotransport. 
D) endocytosis. 
E) exocytosis.

Question 9

In the cells that line the lumen of the small intestine,gap junctions keep materials from the digestive tract from slipping between the cells and entering the tissues.

Accepted Answer

A) True 
 B)False

Question 10

Which statement is NOT true about the proteins in the plasma membrane?

Accepted Answer

A) Proteins may be attached to the inner surface of the plasma membrane. 
B) The hydrophobic portion of a protein is embedded within the membrane. 
C) Some peripheral proteins are connected to cytoskeletal filaments. 
D) Integral proteins are responsible for membrane functions. 
E) Glycoproteins contain carbohydrate chains that are oriented toward the inner surface of the membrane. 
A) Proteins may be attached to the inner surface of the plasma membrane. 
B) The hydrophobic portion of a protein is embedded within the membrane. 
C) Some peripheral proteins are connected to cytoskeletal filaments. 
D) Integral proteins are responsible for membrane functions. 
E) Glycoproteins contain carbohydrate chains that are oriented toward the inner surface of the membrane.

Exam 5: Membrane Structure and Function

Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane.

The newly discovered membrane channel protein that accounts for why water can cross a membrane more quickly than expected is:

In a phospholipid bilayer,the

Study the series of pictures to identify the process as:

Eukaryotic cells are substantially larger than bacterial cells and average over 20 times more volume-per-surface-area than bacterial cells.How can the eukaryotic cell membrane provide this higher rate of exchange of materials?

Which cell junction is unique to animals.

Which is the best definition of active transport?

The process by which cholesterol is transported into the cell by the binding of LDL to its receptor and the internalization of the receptor-LDL complex is

In the cells that line the lumen of the small intestine,gap junctions keep materials from the digestive tract from slipping between the cells and entering the tissues.

Which statement is NOT true about the proteins in the plasma membrane?

A View of Life

Basic Chemistry

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