RNA and Protein Synthesis

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RNA and Protein Synthesis
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I. RNA

1. Formed from nucleotides
2. Single stranded
3. Uracil instead of thymine
4. Sugar ? Ribose
5. Copies the DNA info for protein synthesis

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• 3 Types of RNA
• rRNA (ribosomal) help make up ribosome
• mRNA (messenger) carries the DNA info from
  nucleus to ribosome
• tRNA (transfer) brings amino acids to ribosomes
  to build proteins

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RNA vs DNA
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http//images.encarta.msn.com/xrefmedia/zencmed/ta
rgets/illus/ilt/T068340A.gif
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II. Protein Synthesis

• A. Transcription
• The DNA code is transcribed (copied) into mRNA
  in the nucleus

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• B. mRNA moves into the cytoplasm, attaching to a
  ribosome

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• Translation Each codon of mRNA selects a tRNA
  with a specific amino acid
• Ribosome reads the mRNA and joins amino acids to
  form a protein
• (polypeptide chain)

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• E. After delivering its amino acid, tRNA picks
  up another amino acid

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• From Gene to
• Protein

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A Review of Protein Synthesis

• http//www.youtube.com/watch?v41_Ne5mS2lsfeature
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