1.9 Lipids Flashcards
Lipids contain…
Carbon and hydrogen with some oxygen
Lipids group includes…
Fats, oils, (sterols and waxes)
Scientific name for fats and oils are…
Triglycerides (made up of a glycerol molecule and 3 fatty acids attached)
How many condensation reactions occur to form a triglyceride?
Three
In SATURATED fatty acids all the bonds are…
Single bonds (maximum amount of hydrogen atoms is attached)
In UNSATURATED fatty acids…
Some of the carbon atoms join together by double bonds, they contain less hydrogen
The fatty acid is MONOUNSATURATED if…
There is only one double carbon-carbon bond
The fatty acid is POLYUNSATURATED if…
More than one double bond present
The more unsaturated a fatty acid is…
The more liquid it is
Unsaturated fats tend to be classed as oils
High in saturated fats tend to be from…
Animal sources
High in unsaturated fats tends to be from…
Plant sources
Lipids in the diet are needed…
To make phospholipids for our cell membranes
Synthesise certain hormones
Cholesterol for our cell membranes
Fatty acids that can’t be made in the body are called…
Essential fatty acids, e.g. Omega-3
More essential fatty acids the more flexible the cell membrane
How much of out total energy requirements should be from fats?
35%
1g of carbohydrate produces about 17kJ of energy, 1g of fat produces about…
39 kJ
