Biological Molecules: Lipids Flashcards

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What are lipids?

Lipids are fats and oils. They are large molecules found in food and in living cells.

A lipid is made when three fatty acids join to one glycerol molecule.

Foods rich in lipids include butter, cheese and cooking oil.

Lipids act as a long-term energy store. They release a lot of energy when broken down in cells.

1 gram of lipid releases about twice as much energy as 1 gram of carbohydrate.

A layer of fat under the skin works as insulation. It slows down heat loss from the body.

Fat around organs like the kidneys acts as padding. It helps to protect them from knocks.

Special lipids form most of the cell membrane. They make a thin barrier that controls what enters and leaves the cell.

Plants store lipids as oils in seeds and some fruits. These oils provide energy for the growth of the new plant.

No. Lipids are insoluble in water, which means they do not dissolve in it.

Lipids are made of the elements carbon, hydrogen and oxygen.