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A-Level Biology OCR A

Ribosomes Outline Structure Function Site Protein Synthesis Free

Ribosomes, responsible for protein synthesis, are non-membranous organelles composed of RNA, found freely or attached to the ER.

Ribosomes are the sites of protein synthesis and are not surrounded by a membrane. They can be free-floating or attached to the ER, and are composed of RNA made in the nucleolus.

Front Outline the structure and function of ribosomes.
Back Ribosomes - the site of protein synthesis
  • Can be free floating in the cytoplasm or attached to endoplasmic reticulum forming RER (eukaryotic ribosomes)
  • Can also be in mitochondria, chloroplasts and prokaryotic cells (prokaryotic ribosomes)
  • Not surrounded by a membrane
  • Constructed of RNA made in the nucleolus

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