The importance of carbohydrates

Because they are:-

- The main and quickest source of energy in living organisms

- They are used in storing energy in living organisms till they need it, as plants store carbohydrates in the form of starch, whereas animals and humans store them in the form of Glycogen in liver and muscles

- The basic component of some parts of cell such as cellulose in the cell walls of plant cells, protoplasm and cellular membranes.

Benedict reagents can be used to detect simple sugars

Because simple sugars change their colours form blue to orange

The importance of lipids

Because they are:-

- source of energy:

- The main component of cell membranes

- They make up 5% of the organic compounds forming living cell

- Some animals store lipids under their skins to protect them from low temperature (polar bears, penguins, seals)

- They work as protective layers in some plants and animals

- Some of them work as hormones (steroids)

The biological importance of phospholipids

Becausethey form the membranes of plant and animal cells

Monosaccharides are good sources of energy

Because Monosaccharides (such as glucose) are oxidized inside the mitochondria of cells which releases energy from them in the form of chemical bonds. Then, these chemical bonds are stored inside Adenosine Triphosphate (ATP) which supplies all parts of cell with the energy required for all the cellular biological processes

6- Some birds' feathers are covered with oils

to protect them from water which disable their movement..

Waxes cover the leaves of desert plants

To decrease the amount of water lost during transpiration process

Steroids play an important role in living organisms

Because some of them work as hormones inside the bodies of living organisms

Sudan IV reagents are used to detect lipids

Because lipids dissolve in them changing their colours to red.

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