CHAPTER 11
MEMBRANE STRUCTURE
2004 Garland Science Publishing
The Lipid Bilayer
11-1 For each of the following sentences, fill in the blanks with the best word or phrase
selected from the list below. Not all words
...
CHAPTER 11
MEMBRANE STRUCTURE
2004 Garland Science Publishing
The Lipid Bilayer
11-1 For each of the following sentences, fill in the blanks with the best word or phrase
selected from the list below. Not all words or phrases will be used; each word or phrase
should be used only once.
The specialized functions of different membranes are largely determined
by the __________________ they contain. Membrane lipids are
__________________ molecules, composed of a hydrophilic portion and
a hydrophobic portion. All cell membranes have the same
__________________ structure, with the __________________ of the
phospholipids facing into the interior of the membrane and the
__________________ on the outside. The most common lipids in most
cell membranes are the __________________. The head group of a
glycolipid is composed of __________________.
amphipathic hydrophobic phosphatidylserine
cholesterol lipid bilayer phospholipids
fatty acid tails lipid monolayer proteins
glycolipids lipids sterols
hydrophilic head groups phosphatidylcholine sugars
11-2 Which of the following membrane lipids does not contain a fatty acid tail?
(a) Phosphatidylcholine
(b) A glycolipid
(c) Phosphatidylserine
(d) Sphingomyelin
(e) Cholesterol
11-3 Which of the following statements regarding lipid membranes is TRUE?
(a) Phospholipids will spontaneously form liposomes in nonpolar solvents.
(b) In eucaryotes, all membrane-enclosed organelles are surrounded by one lipid
bilayer.
(c) Membrane lipids diffuse within the plane of the membrane.
(d) Membrane lipids frequently flip-flop between one monolayer and the other.
(e) The preferred form of a lipid bilayer in water is a flat sheet with exposed edges.
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