Question 1

You have purified a cell membrane and wish to isolate a transport protein from it.Which treatment might you select?

Accepted Answer

A) Add a detergent. 
B) Change the ionic strength. 
C) React with a protease. 
D) Add phenylisothiocyanate (PIT
C) . 
A) Add a detergent. 
B) Change the ionic strength. 
C) React with a protease. 
D) Add phenylisothiocyanate (PIT
C) . A

Question 2

Glycerophospholipids have ________ heads and long ________ fatty acid tails.

Accepted Answer

A) polar;polar 
B) polar;hydrophobic 
C) hydrophobic;polar 
D) hydrophobic;hydrophobic 
A) polar;polar 
B) polar;hydrophobic 
C) hydrophobic;polar 
D) hydrophobic;hydrophobic B

Question 3

Most bacteria do not have sphingolipids or steroids.

Accepted Answer

A) True 
 B)False  True

Question 4

Trans fatty acids have physical properties like those of

Accepted Answer

A) w-3 fatty acids. 
B) cis-fatty acids. 
C) unsaturated fatty acids. 
D) saturated fatty acids. 
A) w-3 fatty acids. 
B) cis-fatty acids. 
C) unsaturated fatty acids. 
D) saturated fatty acids.

Question 5

If the concentration of a solute is the same both inside and outside the cell,what might you expect with regard to its transport by a membrane protein?

Accepted Answer

A) Since there is no concentration gradient,no transport either in or out of the cell is possible. 
B) Movement of the solute across the membrane could occur and cause accumulation on one side of the membrane by an active transport protein. 
C) The transport protein has been saturated. 
D) The solute must be phosphorylated with a phosphate group from ATP before further transport can occur. 
A) Since there is no concentration gradient,no transport either in or out of the cell is possible. 
B) Movement of the solute across the membrane could occur and cause accumulation on one side of the membrane by an active transport protein. 
C) The transport protein has been saturated. 
D) The solute must be phosphorylated with a phosphate group from ATP before further transport can occur.

Question 6

Why should it not be surprising that for many cells water requires a protein for its transport across a membrane?

Accepted Answer

A) Water is very polar which inhibits its free diffusion across the membrane. 
B) All molecules require transport proteins to cross a membrane. 
C) The transport protein is needed to prevent the hydrolysis of the phospholipid chains as water crosses the membrane. 
D) There is never a concentration gradient for water across the membrane to drive its transport. 
A) Water is very polar which inhibits its free diffusion across the membrane. 
B) All molecules require transport proteins to cross a membrane. 
C) The transport protein is needed to prevent the hydrolysis of the phospholipid chains as water crosses the membrane. 
D) There is never a concentration gradient for water across the membrane to drive its transport.

Question 7

Like bacteria,plants do not contain steroids.

Accepted Answer

A) True 
 B)False

Question 8

A fatty acid designated as 20:0 is ________,while one that is designated 20:3 D5,8,11 is ________.

Accepted Answer

A) simple;complex 
B) complex;simple 
C) saturated;unsaturated 
D) unsaturated;saturated 
E) monounsaturated;polyunsaturated 
A) simple;complex 
B) complex;simple 
C) saturated;unsaturated 
D) unsaturated;saturated 
E) monounsaturated;polyunsaturated

Question 9

Sterols are steroids which have

Accepted Answer

A) a hydroxyl group at position C-17. 
B) a hydroxyl group at position C-3. 
C) the ability to accumulate as plaques in blood vessels. 
D) 5 fused rings instead of 4 fused rings. 
E) hydroxyl groups at both position C-3 and C-17. 
A) a hydroxyl group at position C-17. 
B) a hydroxyl group at position C-3. 
C) the ability to accumulate as plaques in blood vessels. 
D) 5 fused rings instead of 4 fused rings. 
E) hydroxyl groups at both position C-3 and C-17.

Question 10

Plasma levels of cholesterol and triglycerides are elevated by

Accepted Answer

A) sphingolipids 
B) cis-fatty acids. 
C) trans-fatty acids. 
D) plant oils. 
A) sphingolipids 
B) cis-fatty acids. 
C) trans-fatty acids. 
D) plant oils.

Question 11

Which is not involved in signal transduction?

Accepted Answer

A) Glycolytic pathway. 
B) Receptor tyrosine kinases. 
C) Adenylyl cyclase pathway. 
D) Inositol-phospholipid pathway. 
A) Glycolytic pathway. 
B) Receptor tyrosine kinases. 
C) Adenylyl cyclase pathway. 
D) Inositol-phospholipid pathway.

Question 12

Most lipids in the average human diet are

Accepted Answer

A) unsaturated fatty acids. 
B) saturated fatty acids. 
C) glycerophospholipids. 
D) triacylglycerols. 
A) unsaturated fatty acids. 
B) saturated fatty acids. 
C) glycerophospholipids. 
D) triacylglycerols.

Question 13

Match each lipid with the appropriate function.
-wax

Accepted Answer

A) constricts blood vessels 
B) synthesis of bacterial cell wall 
C) blood clotting 
D) leaf coatings 
E) smooth muscle contraction 
A) constricts blood vessels 
B) synthesis of bacterial cell wall 
C) blood clotting 
D) leaf coatings 
E) smooth muscle contraction

Question 14

Match each lipid with the appropriate function.
-leukotriene D4

Accepted Answer

A) constricts blood vessels 
B) synthesis of bacterial cell wall 
C) blood clotting 
D) leaf coatings 
E) smooth muscle contraction 
A) constricts blood vessels 
B) synthesis of bacterial cell wall 
C) blood clotting 
D) leaf coatings 
E) smooth muscle contraction

Question 15

Isoprenoids are lipids which neither contain nor are derived from fatty acids and include

Accepted Answer

A) steroids. 
B) waxes. 
C) terpenes. 
D) A and C only. 
E) A,B,and C. 
A) steroids. 
B) waxes. 
C) terpenes. 
D) A and C only. 
E) A,B,and C.

Question 16

Adipocytes contain fat droplets which serve to provide an animal with

Accepted Answer

A) increased cell volume. 
B) insulation. 
C) chemical energy. 
D) A and B above. 
E) B and C above. 
A) increased cell volume. 
B) insulation. 
C) chemical energy. 
D) A and B above. 
E) B and C above.

Question 17

Ethanolamine,serine and choline can be cleaved from glycerophospholipids by treatment with

Accepted Answer

A) phospholipase A1. 
B) phospholipase A2. 
C) phospholipase B. 
D) phospholipase C. 
E) phospholipase D. 
A) phospholipase A1. 
B) phospholipase A2. 
C) phospholipase B. 
D) phospholipase C. 
E) phospholipase D.

Question 18

Triacylglycerols are not found in cell membranes because they are

Accepted Answer

A) amphipathic. 
B) not amphipathic. 
C) not abundant in cells. 
D) charged at biological pH. 
A) amphipathic. 
B) not amphipathic. 
C) not abundant in cells. 
D) charged at biological pH.

Question 19

The membrane-spanning portion of a transmembrane protein is almost always a β-strand.

Accepted Answer

A) True 
 B)False

Question 20

Aspirin can alleviate clinical symptoms because it inhibits the synthesis of certain eicosanoids.

Accepted Answer

A) True 
 B)False

Exam 9: Lipids and Membranes

You have purified a cell membrane and wish to isolate a transport protein from it.Which treatment might you select?

Glycerophospholipids have ________ heads and long ________ fatty acid tails.

Most bacteria do not have sphingolipids or steroids.

Trans fatty acids have physical properties like those of

If the concentration of a solute is the same both inside and outside the cell,what might you expect with regard to its transport by a membrane protein?

Why should it not be surprising that for many cells water requires a protein for its transport across a membrane?

Like bacteria,plants do not contain steroids.

A fatty acid designated as 20:0 is ________,while one that is designated 20:3 D5,8,11 is ________.

Sterols are steroids which have

Plasma levels of cholesterol and triglycerides are elevated by

Which is not involved in signal transduction?

Most lipids in the average human diet are

Match each lipid with the appropriate function. -wax

Match each lipid with the appropriate function. -leukotriene D4

Isoprenoids are lipids which neither contain nor are derived from fatty acids and include

Adipocytes contain fat droplets which serve to provide an animal with

Ethanolamine,serine and choline can be cleaved from glycerophospholipids by treatment with

Triacylglycerols are not found in cell membranes because they are

The membrane-spanning portion of a transmembrane protein is almost always a β-strand.

Aspirin can alleviate clinical symptoms because it inhibits the synthesis of certain eicosanoids.

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Atp Synthesis

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

Filters

Glycerophospholipids have heads and long fatty acid tails.

A fatty acid designated as 20:0 is ,while one that is designated 20:3 D5,8,11 is .