eukaryotic cell structure

• eukaryotic cell

  • composed of membrane bound organelles
  • animal and plant cells
• the nucleus

  • double membrane(nuclear envelope)
  • nuclear pores allow MRNA out of the nucleys and enzymes in
  • contains DNA wrapped around histones(proteins) in a complex called chromatin
• mitochondria

  • the site of aerobic respiration
  • surrounded by double membrane, inner membrane folds=critae
  • fluid matrix inside containing enzymes needed for aerobic respiration
• the ribosomes

  • alone of on RER
  • 80s
  • no membrane
  • each ribosome a complex of ribosomal RNA
• lysosome

  • vesicles with hydrolitic enzymes inside
  • used by cells of immune system
• the endoplasmic recticulum

  rough

  • folds of membrane continuous with nuclear envelope
  • covered in ribosomes on membrane
  • folds and processes proteins, ribosomes on RER produce proteins

  smooth

  • membrane bound sacs
  • produces,processes and stores lipids, carbs ect
• the golgi body

  • flattened sacs of membrane
  • modifys proteins and lipids before packaging into Golgi body vesicles
• centrioles

  • made of hollow fibres(microtubules)
  • 2 centrioles at a right angle= centromere
  • organise spindle fibres during cell divisions