Multiple Choice
Which molecules primarily make up the cell membrane (lipid bilayer) in most cells?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, which set correctly lists the three main components of a phospholipid?
A
A cholesterol ring structure, two fatty acid tails, and a carbohydrate head group
B
A glycerol backbone, two fatty acid tails, and a phosphate-containing (polar) head group
C
A glycerol backbone, three fatty acid tails, and a phosphate-containing head group
D
A sphingosine backbone, a peptide chain, and a phosphate-containing head group
Verified step by step guidance1
Step 1: Understand the structure of a phospholipid, which is a major component of the lipid bilayer in cell membranes.
Step 2: Identify the three main parts of a phospholipid: the glycerol backbone, the fatty acid tails, and the phosphate-containing head group.
Step 3: Recognize that the glycerol backbone is a three-carbon molecule that connects the other components.
Step 4: Note that there are two fatty acid tails attached to the glycerol, which are hydrophobic (water-repelling) and help form the interior of the bilayer.
Step 5: The phosphate-containing head group is polar and hydrophilic (water-attracting), facing the aqueous environment inside and outside the cell.
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