![]() -One large subunit on top w/ smaller one on bottom.-Subunits composed of ribosomal RNA (rRNA) molecules and many distinct proteins.-Composed of a type of RNA and protein.E: site from which tRNA that has lost its amino acid is discharged.P: holds tRNA carrying the growing polypeptide chain.A: holds rRNA carrying the next amino acid to be added to the polypeptide chain.-Between subunits: binding sites for mRNA and tRNA (site A, P, and E) (204).-Decode strands of mRNA to produce polypeptides in the space between the two subunits.-Rough ER has ribosomes on the exterior of the channels (22).Made of rRNA and have two subunits (513) -The part of the cell where proteins are made.-Ribosomes are complex structures within the plasma membrane, but they have no exterior membrane.-They occur in very large numbers in cells with high protein production, and when numerous, impart a granular appearance to an electron micrograph of the prokaryotic cell.-Occur in all prokaryotic cells and function as sites of protein synthesis. ![]() -One large subunit on top with one small subunit attached to bottom.(More protein synthesis, more ribosomes found) Key: ABC – from the HLB textbook ABC – from the AP Bio textbook *some sentences may contain the pg. *RiBOSOMES* Definition: Small spherical structures, consisting of two subunits. Cell Organelles Class Presentation on Topic 2 4A– IB Biology HL ![]()
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