Question at position 30 What amphipathic molecule makes up most of the cell membrane?steroidtriacylgylcerolphospholipidnucleic acidglycogen

Question

BlackTom AI · Accepted Answer

The question asks which amphipathic molecule makes up most of the cell membrane.
Option 1: steroid — While steroids (like cholesterol) are components of membranes and help modulate fluidity, they do not constitute the bulk of the membrane's mass. They are present in smaller amounts relative to phospholipids.
Option 2: triacylglycerol — Triacylglycerols are primarily energy storage molecules in adipose tissue and elsewhere; they are non-polar and do not form the structural bilayer of membranes, so this choice is incorrect for describing the main membrane constituent.
Option 3: phospholipid — This molecule is amphipathic, having both hydrophilic heads and hydrophobic tails, which drives the formation of the phospholipid bilayer that constitutes most of the membrane's structure. The arrangement allows a hydrophobic interior and a hydrophilic exterior interacting with aqueous environments, making this the central component of membranes.
Option 4: nucleic acid — Nucleic acids (DNA and RNA) store and transmit genetic information but are not structural components of the cell membrane; thus this option does not describe the membrane’s makeup.
Option 5: glycogen — Glycogen is a polysaccharide used for energy storage in cells, not a membrane lipid or membrane constituent, so it cannot be described as the main membrane component.
In summary, among the options provided, the amphipathic molecule that forms the fundamental bilayer architecture of the cell membrane is the phospholipid, while the other choices either serve different cellular roles or do not possess the amphipathic properties needed to assemble a membrane bilayer.

Question at position 30 What amphipathic molecule makes up most of the cell membrane?steroidtriacylgylcerolphospholipidnucleic acidglycogen单项选择题

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