Basic Concepts  in Biology

  • Cell- structural and functional unit of all life
  • Tissue- group of differentiated cells that perform a function
  • Organ- collection of different types of tissues that perform a collective function
  • Organ system- a conjugated system of multiple organs hat enable various life processes
  • Basis of classification
    • Unicellular or multicellular
    • Autotrophic or heterotrophic
    • Body organisation level
  • Hierarchy of classification
    • Kingdom
    • Phylum
    • Class
    • Order
    • Family
    • Genus
    • Species
  • Some common pathogens and the diseases they cause
Influenza virus Common cold
Plasmodium Vivax Malaria
Polio virus Poliomyelitis
Amoeba hystolitica Amoebic dysentery
Salmonella typhii Typhoid
Mycobacterium tuberculosis Tuberculosis
Human immuno virus (HIV) Acquired immune deficiency syndrome (AIDS)
Rabdo virus Rabies