Biological Lipids: Structure and Function Quiz

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22 Questions

What are lipids mainly formed from?

Which of the following is not a major biological function of lipids?

How are lipids transported in the blood?

How are lipids divided based on their complexity?

Which phospholipid is a major component of the mitochondrial membrane and promotes the formation of highly curved regions within the inner mitochondrial membrane?

Which phospholipid is the most abundant in cell membranes and is also known as lecithins?

Which phospholipid contains ethanolamine instead of choline and is known as cephalins?

Which phospholipid plays a key role in cell cycle signaling, specifically in relation to apoptosis?

Which phospholipid is a precursor of secondary messengers?

What are lysophospholipids mainly important for?

What percentage of brain and muscle phospholipids do plasmalogens constitute?

What are sphingomyelins abundant in?

What is the main component of fat stores in organisms?

Which type of fatty acids have a lower melting point and are more susceptible to oxidation?

What are linoleic and linolenic acids known as?

What is the significance of phosphatidylglycerol?

What affects the spatial configuration and importance of unsaturated fatty acids in membranes?

What are complex lipids mainly composed of, besides fatty acids and alcohols?

How many types of fatty acids have been identified?

What is the structure of unsaturated fatty acids?

What are phospholipids derived from?

How many classes are phospholipids divided into?


  • Simple lipids are made up of fatty acids and their esters with various alcohols, while complex lipids contain other groups besides fatty acids and alcohols, such as phospholipids and glycolipids.
  • More than 100 types of fatty acids have been identified, which can be saturated or unsaturated and have varying lengths and locations of double bonds.
  • Fatty acids are long hydrocarbon chains with a methyl group at one end and a carboxyl group at the other. They are mostly straight chains with an even number of carbon atoms.
  • Unsaturated fatty acids have a lower melting point and are more susceptible to oxidation than saturated fatty acids.
  • Linoleic and linolenic acids are essential unsaturated fatty acids that cannot be produced by mammals and must be obtained through diet.
  • Unsaturated fatty acids can have cis or trans double bonds, which affects their spatial configuration and importance in membranes.
  • Triacylglycerols are esters of fatty acids with glycerol and are the main components of fat stores in organisms.
  • Phospholipids are important components of biological membranes, derived from glycerol and a more complex alcohol called sphingosine, and consist of a glycerol/sphingosine backbone, two fatty acids, and a phosphorylated alcohol.
  • Phospholipids are divided into eight classes, including phosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidylinositol, lysophospholipids, plasmalogens, and sphingomyelins.
  • Phosphatidylglycerol is significant as it forms cardiolipin in mitochondria.


Test your knowledge on the structure, nomenclature, and classification of biological lipids, including fatty acids, triacylglycerols, phospholipids, glycolipids, and steroids. Understand the chemical diversity and insolubility in water of biological lipids, along with their significance in living cells.

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