Lipids Nomenclature and Classification Quiz

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Questions and Answers

What are the majority of biological lipids and how does their nature help them function?

The majority of biological lipids are 'amphipathic' in nature, which helps them to act as effective barriers to more polar molecules in membranes.

How can fatty acids be classified and what are examples of essential fatty acids?

Fatty acids can be classified as saturated or unsaturated and by chain length (short, medium, long). Examples of essential fatty acids include linoleic and linolenic acids.

What is the general structure of fatty acids and what is a common characteristic of 'n' in their structure?

The general structure of fatty acids is CH3(CH2)nCOOH, and 'n' is almost always even.

What are some examples of saturated fatty acids and what is their chain length?

<p>Examples of saturated fatty acids include Lauric acid (12 C), Myristic acid (14 C), Palmitic acid (16 C), Stearic acid (18 C), and Arachidic acid (20 C).</p> Signup and view all the answers

In nature, which type of fatty acids are slightly more abundant than saturated fatty acids? Where are they particularly abundant?

<p>Unsaturated fatty acids are slightly more abundant in nature than saturated fatty acids, especially in higher plants.</p> Signup and view all the answers

Flashcards

What are amphipathic lipids?

Lipids that have both a hydrophilic (water-loving) and a hydrophobic (water-fearing) region. This dual nature makes them ideal for forming barriers, like cell membranes, which separate the watery interior of a cell from the watery environment outside.

How are fatty acids classified?

Fatty acids are classified based on the presence or absence of double bonds in their hydrocarbon chain. Saturated: no double bonds, Unsaturated: one or more double bonds.

What are essential fatty acids?

Essential fatty acids are fatty acids that the body cannot synthesize and must be obtained from the diet. Examples include linoleic acid (omega-6) and linolenic acid (omega-3).

What is the general structure of fatty acids?

The general structure of a fatty acid is a long hydrocarbon chain with a carboxyl group at one end. The 'n' in the formula represents the number of carbon atoms in the chain. Almost always, 'n' is an even number.

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Are unsaturated or saturated fatty acids more abundant in nature?

Unsaturated fatty acids, which are more abundant than saturated fatty acids in nature, especially in plants, have one or more double bonds in their structure.

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Study Notes

Lipids Overview

  • Lipids are water-insoluble compounds.
  • Most lipids are fatty acids or esters of fatty acids.
  • Lipids are soluble in non-polar solvents such as petroleum ether, benzene, and chloroform.

Functions of Lipids

  • Energy storage
  • Structure of cell membranes
  • Thermal insulation and cushioning
  • Precursors of hormones (steroids and prostaglandins)

Classification of Lipids

  • Fatty acids
  • Neutral lipids
  • Phospholipids and other complex lipids

Types of Lipids

Amphipathic Lipids

  • All biological lipids are amphipathic
  • Examples:

Fatty Acids

  • Part of most lipids

Triacylglycerols

  • Also known as neutral lipids

Glycerophospholipids

  • Phospholipids and other complex lipids

Sphingolipids

  • Distinct type of lipid

Waxes

  • Type of lipid

Isoprene-based Lipids

  • Includes steroids
  • Examples: Prostaglandins, Leukotrienes

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