SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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have hydrophobic heads that face the center of the membrane and are shielded from water
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have hydrophilic tails that face outward
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remain fluid because they are tightly packed
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none of these
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Detailed explanation-1: -Phospholipids are major membrane lipids that consist of lipid bilayers. This basic cellular structure acts as a barrier to protect the cell against various environmental insults and more importantly, enables multiple cellular processes to occur in subcellular compartments.
Detailed explanation-2: -Four major phospholipids predominate in the plasma membrane of many mammalian cells: phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin. The structures of these molecules are shown in Figure 10-12.
Detailed explanation-3: -The fundamental building blocks of all cell membranes are phospholipids, which are amphipathic molecules, consisting of two hydrophobic fatty acid chains linked to a phosphate-containing hydrophilic head group (see Figure 2.7).
Detailed explanation-4: -A membrane phospholipid, which is a precursor to all known phosphoinositides and is composed of an inositol head ring and a fatty-acid tail.