LYSOSOMES LYSOSOMES hold chemicals that break down food molecules, old cell parts, and harmful bacteria.  They are surrounded by a lipid bilayer membrane that keeps their strong digestive chemicals contained inside.  Thus, the lysosomes have similar functions to the digestive system of the body.  

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  RIBOSOMES         RIBOSOMES are little grains of RNA and proteins.  Their job is to assemble amino acids into proteins under the direction of the cell's DNA.  Some ribosomes are associated with the rough endoplasmic reticulum and assist with its protein synthesis.  

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MITOCHONDRIA         MITOCHONDRIA are the organelles that make the molecules that provide cell energy (ATP).  One of these organelles is a mitochondrion which means thread-like granule.  Mitochondria are small spherical or elliptical organelles surrounded by a special lipid bilayer membrane.  The membranes of mitochondria both separate them from the cytoplasm and divide the inside into leaflets.  Mitochondria are where the cell's energy is made.  Thus mitochondria are sometimes called the cell's powerhouse.    

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