Fatty acids that are ester-bonded to glycerol (as glycerol-3-phosphate membrane lipids) can be found in all of the following eukaryotic organelles except:
A. the mitochondrion
B. the ribosome
C. the peroxisome
D. the nucleus
E. the lysosome
1) Glycerol-three-phosphate membrane lipids, also known as glycerophospholipids are the most ubiquitous of all membrane lipids. They are in all membrane-bound organelles.
They are essentially, fatty acids, ester bonded to glycerol.
Some examples are plasmalogens, phosphidates, and phosphatidylcholine. Like all membrane lipids, they are amphipathic, which means they are both hydrophobic and hydrophilic.
Let us review the choices.
1) Mitochondria - 37% phosphatidylcholine
2)Ribosome -made up of protein and nucleic acids. Used in translation, is not a membrane-bound organelle.
3)Peroxisome - Contains plasmalogens
4)Nucleus - 55% phosphatidylcholine
5) Lysosome -30% phosphatidylcholine
Therefore it is obvious that Ribosomes do not contain any glycerophospholipids.
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