World of Microorganisms (21)

Influenza virus

Virus mosaic

Adenovirus

Bacteriophage (combination of helix and polyhedral)

Basic structure of bacteria (1)

Viruses are made up of nucleic acid threads (deoxyribonucleic acid (DNA) or ribonucleic acid (RNA)) which are protected by a protein layer

Basic structure of bacteria (2)

Protein layer of viruses known as capsid determines the shape of the virus

Special characteristics of viruses (1)

Viruses do not have living characteristics outside their host because they do not respire, excrete, grow and respond towards stimulus

Special characteristics of viruses (2)

Viruses only reproduce by infecting the cells of their hosts such as bacteria, animals and plants

Reproduction sequence of bacteriophage in a bacterial cell (1)

Virus attaches itself to the surface of its host cell such as a bacterial cell

Reproduction sequence of bacteriophage in a bacterial cell (2)

Virus injects its genetic material, the DNA into the bacterial cell