(1961)%20Watson%20

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(1961) Watson Crick proposed

• DNA controlled cell function by serving as a
  template for PROTEIN structure.
• 3 Nucleotides a triplet or CODON
• (which code for a specific AMINO ACID)
• AMINO ACIDS are the building blocks of proteins.

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• Three kinds of RNA

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Ribosomal RNA folding pattern in E.coli
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DNA Transcription

• unzips RNA polymerase
• mRNA is made along one side (RNA polymerase)
• In nucleus
• mRNA travels to ribosome for translation into a
  polypeptide

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The gene for having purple flowers codes for an
enzyme responsible for making a purple protein.
Without that enzyme, the purple protein wont be
made.
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The gene for round peas codes for an enzyme
involved in making starch branched. This
takes up more space.
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DNA Translation

1. mRNA goes to ribosome
2. tRNA attaches
3. AA on tRNA forms a poly-peptide!

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Transcription/Translation Quiz

• Why is transcription necessary?
• Describe transcription.
• Why is translation necessary?
• Describe translation.
• What are the main differences between DNA and
  RNA.
• Using the chart on page 303, identify the amino
  acids coded for by these codons
• UGGCAGUGC

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• 1. Why is transcription necessary?
• Transcription makes messenger RNA (MRNA) to
  carry the code for proteins out of the nucleus to
  the ribosomes in the cytoplasm.
• 2. Describe transcription.
• RNA polymerase binds to DNA, separates the
  strands, then uses one strand as a template to
  assemble MRNA.
• 3. Why is translation necessary?
• Translation assures that the right amino acids
  are joined together by peptides to form the
  correct protein.

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• 4. Describe translation.
• The cell uses information from MRNA to produce
  proteins.
• 5. What are the main differences between DNA and
  RNA.
• DNA has deoxyribose, RNA has ribose DNA has 2
  strands, RNA has one strand DNA has thymine, RNA
  has uracil.
• Using the chart on page 303, identify the amino
  acids coded for by these codons UGGCAGUGC
• tryptophan-glutamine-cysteine