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Organelles and Functions

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Last Updated By nickiebranting on 10/21/2009

Organelles and Functions

Cards: 12 | Views: 2410

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Flashcard Deck Tags

AP biology, Organelles and Functions

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Nuclear Envelope

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Free Flashcard From Organelles and Functions

Question: Ribosomes

Answer: Cells need to make proteins. Those proteins might be used as enzymes or as support for other cell functions. When you need to make proteins, you look for ribosomes. Ribosomes are the protein builders or the protein synthesizers of the cell. They are like construction guys who connect one amino acid at a time and build long chains. A ribosome is not just one piece. There are two pieces or subunits. Scientists named them 60-S (large) and 40-S (small). When the cell needs to make protein, mRNA is created in the nucleus. The mRNA is then sent into the cell and the ribosomes. When it is time to make the protein, the two subunits come together and combine with the mRNA. The subunits lock onto the mRNA and start the protein synthesis.