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Do Now: 1. Turn in Lab (Strawberry DNA) 2. Begin working on the 10-1 review guide – it will be your homework tonight.
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RNA is a polymer of nucleotides, just like DNA. There are a few important differences though: RNA processes information, DNA stores it. RNA is single stranded, DNA is double stranded. In RNA, the base uracil (U) replaces thymine (T)… there is no T in RNA RNA nucleotides contain the sugar ribose, not deoxyribose (That’s where the names come from)
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Single stranded A-U, G-C Many shapes possible
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DNA stores information (like a hard drive or thumb drive) and never leaves the nucleus of a cell. RNA uses that information to make proteins. Can be found anywhere in a cell.
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There are 3 major types of RNA molecules, each with their own structure and function. They are mRNA, tRNA, and rRNA.
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Ribosomes are made of rRNA – that’s where their name comes from. rRNA is folded up on itself many times – making a ball-like, globular structure
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mRNA takes messages from the DNA to the rest of the cell. mRNA is a copy of the instructions to make one protein. mRNA’s structure is a straight chain of nucleotides, like a ribbon.
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tRNA has an unusual “cloverleaf” structure. tRNA is needed during the protein- building process because it carries an amino acid and TRANSFERS it to the new protein.
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A dogma is a central belief, assumption or principle of thought. The central dogma of how DNA controls a cell is simple: DNA RNA Protein
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DNA mRNA Protein Transcription Translation Replication
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For the remainder of the period, complete your RNA notes, then begin working on the 10-1 review. We are DONE with 10-1, DNA. There will be a quiz tomorrow. Coach class is tomorrow – be there if you need to be!
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