Question 1

The distribution of peripheral membrane proteins is generally identical on both sides of a given membrane.

Accepted Answer

A) True 
 B)False

Question 2

Polar heads of glycerophospholipids may be

Accepted Answer

A) + charged. 
B) - charged. 
C) neutral,but polar. 
D) a mixture of + and - charges. 
E) All of the above. 
A) + charged. 
B) - charged. 
C) neutral,but polar. 
D) a mixture of + and - charges. 
E) All of the above.

Question 3

Transport of ions and small molecules through a bacterial membrane pore requires energy from an ATP to ADP conversion.

Accepted Answer

A) True 
 B)False

Question 4

Match each technique with its purpose.
-silicic acid column chromatography

Accepted Answer

A) separate fatty acid esters 
B) separate neutral lipids and phospholipids 
C) separate groups of neutral lipids 
D) lateral movement of proteins in cell membranes 
E) diacylglycerol separation based on chain length and degree of unsaturation 
A) separate fatty acid esters 
B) separate neutral lipids and phospholipids 
C) separate groups of neutral lipids 
D) lateral movement of proteins in cell membranes 
E) diacylglycerol separation based on chain length and degree of unsaturation

Question 5

Very large molecules (macromolecules)can be transported across membranes by ________.

Accepted Answer

A) pores or channels with very large openings through the center 
B) active transport proteins 
C) diffusion down a concentration gradient 
D) endocytosis or exocytosis 
A) pores or channels with very large openings through the center 
B) active transport proteins 
C) diffusion down a concentration gradient 
D) endocytosis or exocytosis

Question 6

Proteins that transport water across cell membranes are called aquaporins.

Accepted Answer

A) True 
 B)False

Question 7

Cholesterol accounts for 20% to 25% of the mass of lipids in a typical mammalian plasma membrane.

Accepted Answer

A) True 
 B)False

Question 8

Vitamins A,E and K contain an isoprenoid portion.

Accepted Answer

A) True 
 B)False

Question 9

Lipid-anchored membrane proteins that link to an isoprenoid chain via the sulfur atom of cysteine are called ________ proteins.

Accepted Answer

A) prenylated 
B) sulfide-linked 
C) cysteine-anchored 
D) prostaglandins 
A) prenylated 
B) sulfide-linked 
C) cysteine-anchored 
D) prostaglandins

Question 10

Which statement is false about lipid rafts?

Accepted Answer

A) Membrane proteins help maintain the integrity of membrane rafts. 
B) They are distributed non-uniformly on the mammal cell surfaces. 
C) They occur mostly on the outer mitochondrial membrane. 
D) They are patches of cholesterol associated with sphingolipids. 
A) Membrane proteins help maintain the integrity of membrane rafts. 
B) They are distributed non-uniformly on the mammal cell surfaces. 
C) They occur mostly on the outer mitochondrial membrane. 
D) They are patches of cholesterol associated with sphingolipids.

Question 11

Which type of membrane protein might be dissociated from the membrane by changing the pH or the ionic strength?

Accepted Answer

A) Integral membrane protein. 
B) Peripheral membrane protein. 
C) Lipid-anchored membrane protein. 
D) All of the above. 
A) Integral membrane protein. 
B) Peripheral membrane protein. 
C) Lipid-anchored membrane protein. 
D) All of the above.

Question 12

What is the role of cholesterol in animal cell membranes?

Accepted Answer

A) Blocks the association of the fatty acyl chains of phospholipids at high temperature. 
B) Aids in the transport of small hydrophobic molecules across the membrane. 
C) Is a receptor site for hormones on the surface of membranes. 
D) Broadens the temperature range of optimum membrane fluidity. 
A) Blocks the association of the fatty acyl chains of phospholipids at high temperature. 
B) Aids in the transport of small hydrophobic molecules across the membrane. 
C) Is a receptor site for hormones on the surface of membranes. 
D) Broadens the temperature range of optimum membrane fluidity.

Question 13

Lipids derived from cholesterol aid digestion and absorption of other lipids such as triacylglycerols.

Accepted Answer

A) True 
 B)False

Question 14

Bactoprenol synthesis is inhibited by the antibiotic bacitracin.Therefore,it can be used to treat yeast infections.

Accepted Answer

A) True 
 B)False

Question 15

In the mitochondria phosphate ion (PO4³-)and H+ are transported together from the intermembrane space into the matrix.Which statement applies?

Accepted Answer

A) The transport protein is a symport. 
B) The transport protein must have a relatively large central channel to accommodate both ions. 
C) The interior of the transport protein must be uncharged. 
D) All of the above. 
A) The transport protein is a symport. 
B) The transport protein must have a relatively large central channel to accommodate both ions. 
C) The interior of the transport protein must be uncharged. 
D) All of the above.

Question 16

Symport and antiport proteins must be active transport proteins.

Accepted Answer

A) True 
 B)False

Question 17

Secondary active transport involves the conversion of ATP to ADP.

Accepted Answer

A) True 
 B)False

Question 18

The proportion of lipids to proteins is the same in different cell membranes.

Accepted Answer

A) True 
 B)False

Question 19

Which type of sphingolipid can also be classified as a phospholipid?

Accepted Answer

A) Sphingomyelins. 
B) Cerebrosides. 
C) Gangliosides. 
D) Neurosides. 
A) Sphingomyelins. 
B) Cerebrosides. 
C) Gangliosides. 
D) Neurosides.

Question 20

Match each lipid with the appropriate function.
-bactoprenol

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

Exam 9: Lipids and Membranes

The distribution of peripheral membrane proteins is generally identical on both sides of a given membrane.

Polar heads of glycerophospholipids may be

Transport of ions and small molecules through a bacterial membrane pore requires energy from an ATP to ADP conversion.

Match each technique with its purpose. -silicic acid column chromatography

Very large molecules (macromolecules)can be transported across membranes by ________.

Proteins that transport water across cell membranes are called aquaporins.

Cholesterol accounts for 20% to 25% of the mass of lipids in a typical mammalian plasma membrane.

Vitamins A,E and K contain an isoprenoid portion.

Lipid-anchored membrane proteins that link to an isoprenoid chain via the sulfur atom of cysteine are called ________ proteins.

Which statement is false about lipid rafts?

Which type of membrane protein might be dissociated from the membrane by changing the pH or the ionic strength?

What is the role of cholesterol in animal cell membranes?

Lipids derived from cholesterol aid digestion and absorption of other lipids such as triacylglycerols.

Bactoprenol synthesis is inhibited by the antibiotic bacitracin.Therefore,it can be used to treat yeast infections.

In the mitochondria phosphate ion (PO4³-)and H+ are transported together from the intermembrane space into the matrix.Which statement applies?

Symport and antiport proteins must be active transport proteins.

Secondary active transport involves the conversion of ATP to ADP.

The proportion of lipids to proteins is the same in different cell membranes.

Which type of sphingolipid can also be classified as a phospholipid?

Match each lipid with the appropriate function. -bactoprenol

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

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