nucleus: - controls the metabolic activities of the cell - contains genetic information in the form of DNA - double membrane called nuclear envelope with small holes called nuclear pores (if it has DNA its a double membrane) nucleolus: - area within the nucleus which produces ribosomes - made of proteins and RNA - RNA used to produce rRNA which combines with proteins to form ribosomes cell surface membrane: - phospholipid bilayer with proteins - controls movement of substances in and out of the cell mitochondria: - site of aerobic respiration - contains a small amount of DNA (so double membrane) - inner membrane is folded to form structures called cristae vesicles: - single membrane sacs containing fluid - they transport materials inside the cell lysosomes: - forms of vesicles containing hydrolytic enzymes - break down waste material in cells including old organelles smooth endoplasmic reticulum (SER): - network of membranes responsible for lipid and carbohydrate synthesis and storage rough endoplasmic reticulum (RER): - flattened membrane sacs covered in ribosomes - synthesis and transport of proteins ribosomes: - no membrane - site of translation (protein synthesis) golgi apparatus: - stack of flattened membrane sacs - modifies and packages proteins into vesicles