1. Which of the following statements is true? O The most common type of lipids i
ID: 142444 • Letter: 1
Question
1. Which of the following statements is true? O The most common type of lipids in membranes is sphingolipids. O The lipid bilayer is a stable, unchanging structure. O Phosphoglycerides provide most of the structure and stability to cellular membranes. O All membrane lipids are amphipathic. 2. Which of the following is NOT true of phospholipid bilayers? O Membrane budding requires transient breakages in the bilayer membrane. The interior of phospholipid bilayers is a highly hydrophobic environment. O The chemical properties of phospholipids lead to the spontaneous formation of bilayers. O Phospholipid bilayers separate the cell from the exterior environment as well as from compartments within the cell.Explanation / Answer
1. All membrane lipid molecules are amphipathic.
The lipid bilayer is highly dynamic, non-homogenous and asymmetric structure, with four major phospholipids - phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine and sphingomyeline. In addition, the presence of cholesterol provides some stability, which can be seen at more rigid complexes, called lipid rafts.
2. Membrane budding requires transient breakages in the bilayer membrane (Not True).
The lipid bilayer structure is kept intact during membrane budding. The intact bilayer is folded to form a bud.
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