Question 1

Facilitated diffusion requires

Accepted Answer

A)  a channel protein through which the transported substance passes without binding 
B)  a carrier protein to which the transported substance binds 
C)  a receptor protein 
D)  expenditure of energy by the cell 
A)  a channel protein through which the transported substance passes without binding 
B)  a carrier protein to which the transported substance binds 
C)  a receptor protein 
D)  expenditure of energy by the cell

Question 2

How do the membranes of plant and animal cells compare?

Accepted Answer

A)  Animal cell membranes tend to be more rigid than those of plant cells. 
B)  Animal cell membranes tend to be more fluid than those of plant cells. 
C)  Animal cell membranes tend to be more asymmetric than those of plant cells. 
D)  Animal cell membranes tend to be more symmetric than those of plant cells. 
A)  Animal cell membranes tend to be more rigid than those of plant cells. 
B)  Animal cell membranes tend to be more fluid than those of plant cells. 
C)  Animal cell membranes tend to be more asymmetric than those of plant cells. 
D)  Animal cell membranes tend to be more symmetric than those of plant cells.

Question 3

Which of the following lipids is not found in biological membranes?

Accepted Answer

A)  triacylglycerols 
B)  phosphoacylglycerols 
C)  glycolipids 
D)  cholesterol 
A)  triacylglycerols 
B)  phosphoacylglycerols 
C)  glycolipids 
D)  cholesterol

Question 4

Which of the following is not a lipid-soluble vitamin?

Accepted Answer

A)  Ascorbic Acid 
B)  Cholicalciferol 
C)  Vitamin K 
D)  Retinol 
E)  Tocopherol 
A)  Ascorbic Acid 
B)  Cholicalciferol 
C)  Vitamin K 
D)  Retinol 
E)  Tocopherol

Question 5

Which property has not been observed for membrane proteins?

Accepted Answer

A)  energy storage 
B)  transport of substances into and out of the cell 
C)  catalysis (enzymatic activity) 
D)  acting as a receptor 
A)  energy storage 
B)  transport of substances into and out of the cell 
C)  catalysis (enzymatic activity) 
D)  acting as a receptor

Question 6

The HDL class of lipoprotein is generally believed to be preventative of heart disease.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following groups is not present in a phosphatidic acid?

Accepted Answer

A)  Choline 
B)  Fatty acids 
C)  Glycerol 
D)  Phosphate 
E)  All of these are components of phosphatidic acid. 
A)  Choline 
B)  Fatty acids 
C)  Glycerol 
D)  Phosphate 
E)  All of these are components of phosphatidic acid.

Question 8

Glycolipids are particularly important in these structures:

Accepted Answer

A)  Membranes. 
B)  Lipoproteins. 
C)  The brain and nervous system. 
D)  Membranes, the brain and the nervous system. 
E)  All of these are correct. 
A)  Membranes. 
B)  Lipoproteins. 
C)  The brain and nervous system. 
D)  Membranes, the brain and the nervous system. 
E)  All of these are correct.

Question 9

Biological waxes are composed of

Accepted Answer

A)  glycerol and only one fatty acid. 
B)  glycerol and two fatty acids 
C)  a fatty acid and a long-chain alcohol. 
D)  cholesterol and a fatty acid. 
A)  glycerol and only one fatty acid. 
B)  glycerol and two fatty acids 
C)  a fatty acid and a long-chain alcohol. 
D)  cholesterol and a fatty acid.

Question 10

The degree of membrane fluidity depends on

Accepted Answer

A)  the percentage of lipids that contain choline 
B)  the percentage of glycolipids 
C)  the percentage of fatty acids 
D)  the percentage of unsaturated fatty acids 
A)  the percentage of lipids that contain choline 
B)  the percentage of glycolipids 
C)  the percentage of fatty acids 
D)  the percentage of unsaturated fatty acids

Question 11

Which of the following is not a function or characteristic of membrane proteins?

Accepted Answer

A)  Transport 
B)  Catalytic activity 
C)  Blood clotting 
D)  Receptor sites 
A)  Transport 
B)  Catalytic activity 
C)  Blood clotting 
D)  Receptor sites

Question 12

Which of the following compounds yields the most energy per gram?

Accepted Answer

A)  triacylglycerols 
B)  carbohydrates 
C)  proteins 
D)  They all yield about the same amount of energy per gram. 
A)  triacylglycerols 
B)  carbohydrates 
C)  proteins 
D)  They all yield about the same amount of energy per gram.

Question 13

Which of the following is not a characteristic of most fatty acids?

Accepted Answer

A)  Presence of trans double bonds. 
B)  Even number of carbon atoms. 
C)  Only one carboxyl (-COOH) group. 
D)  Absence of conjugated double bonds. 
E)  All of these characterize lipids. 
A)  Presence of trans double bonds. 
B)  Even number of carbon atoms. 
C)  Only one carboxyl (-COOH) group. 
D)  Absence of conjugated double bonds. 
E)  All of these characterize lipids.

Question 14

Where can membrane proteins be located?

Accepted Answer

A)  entirely within the membrane 
B)  on the surface of the membrane 
C)  in either position 
D)  The position of membrane proteins has never been determined. 
A)  entirely within the membrane 
B)  on the surface of the membrane 
C)  in either position 
D)  The position of membrane proteins has never been determined.

Question 15

The difference between active transport and passive transport is that

Accepted Answer

A)  concentration gradients are involved in one and not in the other. 
B)  glycolipids play a role in one and not in the other. 
C)  one requires expenditure of energy by the cell and the other does not. 
D)  ions are transported into and out of the cell by one process and not by the other. 
A)  concentration gradients are involved in one and not in the other. 
B)  glycolipids play a role in one and not in the other. 
C)  one requires expenditure of energy by the cell and the other does not. 
D)  ions are transported into and out of the cell by one process and not by the other.

Question 16

How does the presence of cis double bonds in fatty acids affect membrane fluidity?

Accepted Answer

A)  They tend to increase the fluidity. 
B)  They tend to decrease the fluidity. 
C)  They don't have any specific effect on fluidity. 
A)  They tend to increase the fluidity. 
B)  They tend to decrease the fluidity. 
C)  They don't have any specific effect on fluidity.

Question 17

Which of the following is the best phrase to describe the modern view of membrane structure?

Accepted Answer

A)  Membranes are lipid-lipid bilayers. 
B)  Membranes are lipid-lipid bilayers with associated proteins. 
C)  Membranes are composed solely of lipids and proteins. 
D)  Membranes are a fluid mosaic of lipids and proteins. 
E)  Membranes are found only in eukaryotic cells. 
A)  Membranes are lipid-lipid bilayers. 
B)  Membranes are lipid-lipid bilayers with associated proteins. 
C)  Membranes are composed solely of lipids and proteins. 
D)  Membranes are a fluid mosaic of lipids and proteins. 
E)  Membranes are found only in eukaryotic cells.

Question 18

Which of the following best describes lipids' insolubility in water?

Accepted Answer

A)  They are typically very soluble. 
B)  They are typically insoluble. 
C)  There is no general trend as to lipids' solubility in water. 
A)  They are typically very soluble. 
B)  They are typically insoluble. 
C)  There is no general trend as to lipids' solubility in water.

Question 19

Cell membranes typically display asymmetry.What does this mean?

Accepted Answer

A)  The two leaves of a bilayer contain different collections of lipids and proteins. 
B)  The fatty acyl chain on C-1 of a membrane lipid is usually different from that on C-3. 
C)  Only one stereoisomer is ever seen at the chiral C-2 of the glycerol residue in a membrane lipid. 
D)  Membrane lipids only have cis double bonds, never trans. 
A)  The two leaves of a bilayer contain different collections of lipids and proteins. 
B)  The fatty acyl chain on C-1 of a membrane lipid is usually different from that on C-3. 
C)  Only one stereoisomer is ever seen at the chiral C-2 of the glycerol residue in a membrane lipid. 
D)  Membrane lipids only have cis double bonds, never trans.

Question 20

Which of the following is not true?

Accepted Answer

A)  Plant oils are favored in the diet because they generally contain more unsaturated fats than found in animal fats. 
B)  Unsaturated fatty acids are healthier for humans than saturated ones 
C)  Heart disease can be correlated with diets high in saturated fatty acids 
D)  Unsaturated fatty acids lead to higher levels of LDL than saturated fatty acids do 
A)  Plant oils are favored in the diet because they generally contain more unsaturated fats than found in animal fats. 
B)  Unsaturated fatty acids are healthier for humans than saturated ones 
C)  Heart disease can be correlated with diets high in saturated fatty acids 
D)  Unsaturated fatty acids lead to higher levels of LDL than saturated fatty acids do

Exam 8: Lipids and Proteins Are Associated in Biological Membranes

Facilitated diffusion requires

How do the membranes of plant and animal cells compare?

Which of the following lipids is not found in biological membranes?

Which of the following is not a lipid-soluble vitamin?

Which property has not been observed for membrane proteins?

The HDL class of lipoprotein is generally believed to be preventative of heart disease.

Which of the following groups is not present in a phosphatidic acid?

Glycolipids are particularly important in these structures:

Biological waxes are composed of

The degree of membrane fluidity depends on

Which of the following is not a function or characteristic of membrane proteins?

Which of the following compounds yields the most energy per gram?

Which of the following is not a characteristic of most fatty acids?

Where can membrane proteins be located?

The difference between active transport and passive transport is that

How does the presence of cis double bonds in fatty acids affect membrane fluidity?

Which of the following is the best phrase to describe the modern view of membrane structure?

Which of the following best describes lipids' insolubility in water?

Cell membranes typically display asymmetry.What does this mean?

Which of the following is not true?

Biochemistry and the Organization of Cells

Water: The Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three-Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins: Enzymes

The Behavior of Proteins: Enzymes, Mechanisms, and Control

Nucleic Acids: How Structure Conveys Information

Biosynthesis of Nucleic Acids: Replication

Transcription of the Genetic Code: Biosynthesis of Rna

Protein Synthesis: Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses, Cancer, and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism: Cellular Signaling

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