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Explore the intricate structures of cell organelles such as the nucleus, endoplasmic reticulum, ribosomes, Golgi apparatus, mitochondria, and lysosomes. Learn about their functions in protein synthesis, energy production, and cellular digestion. Discover how proteins play essential roles in growth, repair, signaling, defense, and catalyzing chemical reactions within cells.
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Nucleolus • This is where ribosomes are synthesized. • They are a tangle of chromatin. Not membrane bound.
Nucleus • Contains the chromosomes. • Surrounded by a selectively permiablemembrane that contains pores.
Endoplasmic reticulum • Flattened sacs that traverse the cytoplasm. • Two types: • Rough E.R.- site of protein synthesis from the attached ribosomes. • Smooth E.R.- • Assists in the synthesis of steroid hormones and other lipids • Connect R.E.R to golgi. • Carries out detoxification processes.
Ribosomes • The site of protein synthesis. • Either in cytoplasm or attached to endoplasmic reticulm.
Golgi Apparatus • Near the nucleus, it is flattened membranous sacs surrounded by vesicles. • They package substances from R.E.R and secrete them to other parts or cell surface for export.
Mitochondria • The site of cellular respiration. • All cells have them, very active cells have up to 2,500. • Have an outer double membrane called cristae. • Called the powerhouse of the cell. • Have own DNA.
Lysosome • Sacs of digestive enzymes. • They are the main intracellular digestor. • They are breaking down and recycling cell parts.
Proteins • Complex Macromolecules that carry out many functions. • Examples: • Growth and repair • Signaling • Defense • Catalyzing chemical reactions.