Sections
Lipids
Fatty Acids
Fatty Acid Nomenclature
Omega-3 Fatty Acids
Triacylglycerols
Glycerophospholipids
Sphingolipids
Sphingophospholipids
Sphingoglycolipids
Sphingolipid Recap
Waxes
Eicosanoids
Isoprenoids
Steroids
Steroid Hormones
Lipid Vitamins
Comprehensive Final Map
Biological Membranes
Physical Properties of Biological Membranes
Types of Membrane Proteins
Integral Membrane Proteins
Peripheral Membrane Proteins
Lipid-Linked Membrane Proteins

Concept #1: Omega Fatty Acids

Concept #2: Omega-3 Fatty Acids

Practice: Select all that apply. What do the terms omega-3 (ω-3) and omega-6 (ω-6) indicate about their structures?


a) In ω-6 fatty acids, the carbon backbone is six carbons in length.

b) In ω-6 fatty acids, the double bond nearest the ω methyl group is six carbons along the chain.

c) In ω-3 fatty acids, the double bond nearest the α carbon is three carbons along the chain.

d) In ω-3 fatty acids, the carbon backbone is three carbons in length.

Practice: Draw the structure of docosahexaenoic acid (22:6Δ4,7,10,13,16,19) and indicate what type of omega fatty acid it is.


a) Omega-3 fatty acid. 

b) Omega-6 fatty acid. 

c) Omega-9 fatty acid.

d) Omega-4 fatty acid.

Practice: Assuming the standard shorthand naming system is used, which of the following is an omega-3 fatty acid?


a) 20:1Δ14

b) 18:3Δ9,12,15

c) 20:1Δ3,12

d) 18:2Δ9,12

Practice: Which of the structures below is an example of an omega-3 polyunsaturated fatty acid? 

a) A

b) B

c) C

d) D