features of organism

• ribosomes: carry out protein synthesis
• cells of bacteria do not have nucleus and are known are prokaryotic
• the cells of all other organisms have nuclei and are called eukaryotic
• Plants:

  • multicellular
  • mosses and ferns
  • flowering plants and conifers
  • all plants have chlorophyll and carry out photosynthesis
  • autotrophs
• animal:

  • multicellular
  • obtain their food through ingestion
  • heterotrophs
  • all animals have nervous system which coordinates response to stimuli
• bacteria:

  • surrounded by cells walls or slime capsules
  • no nucleus -> instead loop of DNA
  • additional loops of DNA inside the cytoplasm called plasmids
  • no mitochondria
  • flagellum for movement
• protoctist:

  • have nuclei
  • unicellular and multicellular
  • unicellular are known as protzoas
  • can photosynthesise
• fungi:

  • multicellular (yeast is single celled)
  • has a nucleus
  • cell wall made of chitin
  • do not have chlorphyll
  • reproduce by making spores
  • saprotrophs : they feed on dead or decaying matter
  • digested food is absorbed by hyphae
• viruses

  • not cells
  • particles made of genetic material surrounded by a protein coat
  • parasites: need to enter the cells of another organism (host) in order to multiply