Which statements about the makeup of biological membranes are true? 1) They are
ID: 59540 • Letter: W
Question
Which statements about the makeup of biological membranes are true?
1) They are composed of bilayers in which the polar head group of the lipid is oriented toward solvent and the lipophilic tails are pointed inward toward the interior of the membrane.
2) All fatty acids can form micelles.
3) The major classes of lipids that make up membranes include glycerophospholipids, sphingolipids, and glycoglycerolipids.
4) The hydrophobic interior is typically twice as thick as the polar, hydrophilic head groups.
Statements 1, 2, and 3 are true.
Statements 1, 2, and 4 are true.
Statements 2, 3, and 4 are true.
All of the listed statements are true
Explanation / Answer
All of the listed statements are true.
The lipid bilayer has hydrophobic regions hidden, and the hydrophilic polar heads that orient towards the solvent. Fatty acids also have a polar head and non-polar tail. Due to this, they form micells in which the polar head interacts with solvents and the non-polar tail is hidden inside. The composition of membrane varies with organism, and contains all the above said lipids. Due to the length of the fatty acid tails, the hydrophobic region is thicker than the hydrophilic heads.
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