Introduction to Lipids

Lipids

Lipids represent a large group of molecules which consist almost entirely of carbon and hydrogen atoms.  A key distinguishing feature of lipids is the fact that they are insoluble in water – a characteristic termed “hydrophobic” which means “water fearing” (hydro = water ; phobic = fearful).

Let’s take a closer look at the role of lipids now…


Functions of Lipids

The key functions of lipids in biological systems include:

  • Energy Storage
  • Water Barrier/Protection
  • Cell Membranes
  • Hormones

Lipids can be categorized into (3) functional groups:

  • Oils, Fats, Waxes

    • Energy storage, protection
  • Phospholipids

    • Construction of cell membranes
  • Steroids

    • Hormones

Lipid Function

Lipids

Lipids are water-insoluble molecules which can be categorized into several groups.

  • Oils, fats and waxes
  • Phospholipids
  • Steroids
  • In general, most lipids are used for:
    • Energy storage (fats, oils)
    • Protection from the environment (waxes)
    • Forming cellular membranes (phospholipids)
    • Signaling hormones (steroids)

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BIO109 Biology I Introduction to Biology Copyright © by Diane Rinehart. All Rights Reserved.

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