20 Questions
What type of bond do lipids form?
Ester bonds
Which fatty acid has a higher melting point?
Saturated fatty acid
What is the general number of carbon atoms present in the chain of fatty acids?
12-20
Which enzyme hydrolyses phospholipids into fatty acids in the digestive system?
Phospholipase A1
What is the most abundant mammalian cell fatty acid?
Oleate (18:1)
How are triglycerides defined?
3 fatty acids joined to glycerol
What type of group do phospholipids contain?
Phosphate head groups
Which type of lipid is found in high concentration in the CNS due to its presence in the myelin sheath around the nerves?
Sphingolipids
What is the characteristic structure of sphingosine?
Unbranched 18 carbon alcohol
Which type of lipid is a metabolic precursor of all sphingolipids?
Ceramide
What is the function of gangliosides in lipid synthesis?
Recognition by antibodies and structural purposes
Where does fatty acid synthesis occur?
Cytosol
What is attached to the growing hydrocarbon chain during fatty acid synthesis?
Malonyl ACP
What occurs during the initiation stage of fatty acid synthesis?
Condensation of acetyl and malonyl groups to produce C4 precursor and CO2
What is the role of cholesterol in lipid synthesis?
Vital for membranes fluidity
Plasmalogens contain an ether linkage rather than a vinyl linkage.
False
Sphingolipids are generally present in bacteria.
False
Cholesterol is more common in plants than in eukaryotic membranes.
False
The amino group in sphingosine is located at C2.
True
Gangliosides do not contain any sugars.
False
Test your knowledge on lipids and fatty acids with this quiz. Learn about the structure, properties, and abundance of lipids in biological systems.
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