13.1_and_13.2_Notes.ppt (2) - 13.1 RNA 13.2 Ribosomes...

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13.1 RNA 13.2 Ribosomes & Protein Synthesis Key Questions: 1) How does RNA differ from DNA? 2) How does the cell make RNA? 3) What is the genetic code and how is it read? 4) What role does the ribosome play in assembling proteins? 5) What is the “central dogma” of molecular biology? DNA is the genetic material of cells. The sequence of nucleotide bases in the strands of DNA carries some sort of code. In order for that code to work, the cell must be able to understand it. What, exactly, do those bases code for? Where is the cell’s decoding system?
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The Role of RNA Genes contain coded DNA instructions that tell cells how to build proteins. The first step in decoding these genetic instructions is to copy part of the base sequence from DNA into RNA. RNA , like DNA, is a nucleic acid that consists of a long chain of nucleotides. RNA then uses the base sequence copied from DNA to direct the production of proteins.
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