CHEMICAL COMPOUNDS WHICH CONSTITUTE LIVING ORGANISMS

CHEMICAL COMPOUNDS WHICH CONSTITUTE LIVING ORGANISMS

  • All matter is made up of chemical elements, each of which exists in the form of smaller units called atoms
  • Some of the elements occur in large amounts in living things
  • These include carbon, oxygen, hydrogen, nitrogen, sulphur and phosphorus
  • Elements combine together to form compounds
  • Some of these compounds are organic
  • Organic compounds contain atoms of carbon combined with hydrogen and they are usually complex
  • Other compounds are inorganic
  • Most inorganic compounds do not contain carbon and hydrogen and they are usually less complex
  • Cells contain hundreds of different classes of organic compounds
  • However, there are four classes of organic compounds found in all cells
  • These are: carbohydrates, lipids, proteins and nucleic acids
See also  COMMON DENTAL DISEASES

Carbohydrates

  • Carbohydrates are compounds of carbon, hydrogen and oxygen
  • Hydrogen and oxygen occur in the ratio of 2: 1 as in water
  • Carbohydrates are classified into three main groups: monosaccharides, disaccharides and polysaccharides

Also See:

PROCESS OF PHOTOSYNTHESIS

NUTRITION IN PLANTS

BIOLOGY PRACTICAL

ACTIVE TRANSPORTWATER RELATIONS IN PLANT AND ANIMAL CELLS

 

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