This class includes pigmented lipids.

Lycopene is a caretenoid containing 13 double bonds.

Hydrolysis of fats by alkali is called saponification and it results in the formation of soaps.

Progesterone belongs to a group of steroid hormones called the progestogens, and is the major progestogen in the body. In mammals, progesterone, like all other steroid hormones, is synthesised from pregnenolone, which in turn is derived from cholesterol.

These fatty acids cannot by synthesised by the body. As they have to be provided in the diet, they are essential fatty acids.

It is a hydroxy amino acid with alcohol in the side chain.

These are essential amino acids. These are simple amino acids. These are non-essential acidamide amino acids.

It is required for the formation of nicotinamide.

It is secreted by the sebaceous gland of sheep’s skin. It is obtained from the wool of sheep. It is called wool fat.

Fats are a source of metabolic water for desert animals. Metabolism produces about 110 grams of water per 100 grams of fat.

The bond formed between two amino acids is called peptide bond. A protein molecule is made of many amino acids linked together by peptide bond.

Glycine is required for the formation of haem portion of haemoglobin.

It is a saturated fatty acid.

They control the permeability of the cell membrane. It is the chief constituent of the cell membrane.

Lipids exhibit all of the above listed properties.