BY1.2 - Cell Organelles

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Cell Organelles

Nucleus:

  • Controls all cell activiity
  • Retains chromosmes
  • Bound by a double membrane -  the nuclear membrane and nuclear envelope
  • Nuclear pores allow the transport of mRNA and nucleotides
  • Contains cytoplasm like amtrial - nucleoplasm
  • Contains chromatin 
    • made up of coils of DNA bound to proteins 
    • makes RNA which is needed to produce ribsomes 

Mitochondria:

  • Inner membrane is folded into cristae
  • Organic matricx contains chemical compounds
  • The site of aerobic respiration
  • Some reactions occur in the matrix, others in the inner membrane 
  • Cristae increase teh surface area on which the respiratory processes occur
  • Function: to produce emnergy in the form of ATP 

Endoplasmic Reticulum:

  • Systme of flattened membranous sacs
  • Sluid filled spaces betwen the membranes are calles cisternae
  • Connetcs with the nuclear membane and may link to the golgi body
  • Cavities are connected and allow the transport of material through the cell
  • 2 types:
    • Rough Endoplasmic Reticulum:
      • Ribosomes on the outer surface
      • Function: transporting protines made by ribosomes 
      • Present in cells that make enzymes that can be secreted 
    • Smooth Endoplasmic Reticulum:
      • Membrane that lacks ribosomes
      • Fucntion: synthesis and transport of lipids 

Ribosomes:

  • Made

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