Symmetry in animals

Introduction Symmetry means the arrangement of body parts into geometrical designs. Many adult sponges that are irregular in shape are said to be asymmetrical. However, the sponges start their life from a radially symmetrical larva. Four types of symmetry are found in animals. They are: spherical symmetry, radial symmetry, bi-radial symmetry and bilateral symmetry. Spherical … Read more

Important viruses and their properties

Important viruses and their properties

  Group Virus Characteristics Clinical importance Retroviruses Human T-cell leukaemia virus(HTLV-1)                       Human immune deficiency virus (HIV)       Spherical enveloped virus, 100nm in diameter Icosahedral cores contain two copies of linear RNA molecules and reverse transcriptase.       Differs from other retroviruses … Read more