OCR AS Biology- Lipids

Complete Revision Notes for OCR As level biology on Lipids.

Includes: tables, diagrams and bullet point features

Topics: Lipids, types of lipid, structure and function

HideShow resource information
  • Created by: Abbie_Mac
  • Created on: 17-03-13 22:21
Preview of OCR AS Biology- Lipids

First 194 words of the document:

Contain three main elements: Carbon, Hydrogen and Oxygen
Consist of two types of molecules: Glycerol and Fatty Acids
-Energy source, can be respired to make ATP and energy storage, stored in adipose
-Biological membranes are made from lipids
-Insulation, such as blubber in whales, and electrical insulation around nerve cells
-protection, as surface of plant leaves is protected against drying out by lipid layer
-some hormones (steroid hormones) are lipids
-3 Carbon Atoms, each has an OH group attached
-Filled up with H atoms
-Always the same in lipids
-Fatty acid chains are hydrocarbons with carboxyl chains on one end
- Fatty acids =>This allows fluidity to be controlled
depending on the number of saturated and
unsaturated chains - More unsaturated = more fluid
(oil/margarine example)
-Rest is a hydrocarbon chain (2-20 C's long)
-Usually 18 in Fatty Acids
-Unsaturated (single C-C bond)
-Saturated (one double C=C bond) ­ makes a `kink' in
the chain
-polyunsaturated (double kinks)

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

- tend to be oils as more fluid
-Glycerol + 3 Fatty acid chains
-Three `ester links' (link between fatty acid
and glycerol) are formed and new molecule is a
-can be saturated or unsaturated
-Hydrophobic (insoluble), so charge
distributed evenly around molecule and thus
does not form hydrogen bonds and does not mix well with water.…read more

Page 3

Preview of page 3

Here's a taster:

Cholesterol 4 Carbon based Small, thin molecule Form steroid
rings joined that fits in the hormones
together phospholipid bilayer
­ gives strength and
-…read more

Page 4

Preview of page 4


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »