Bellwork
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Transcript of Bellwork
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Bellwork
• Copy and complete the following Venn Diagram
Replication Transcription
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Science Fact of the Day• The largest octopus is the Enteroctopus dofleini, also
known as the giant Pacific octopus or North Pacific giant octopus. It has a 16 ft arm span and weighs about 110 pounds.
As requested by Victoria Westbrook
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CO: I will understand and explain the process and purpose of
translation.
LO: I will write notes about translation. I will play a BINGO
using a codon chart.
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Central DogmaDNA
Nucleus Ribosome
TranslationTranscription
ProteinRNA
Copy and label the:
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Remember our analogy from yesterday….
DNA = master copy of building plansRNA= blueprint for one room of building
Protein= actual bricks that make up the building
Nucleus = boss’ officeRibosome = assembly line (where the bricks are
laid and a wall is built)
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• The decoding of an mRNA message into a polypeptide chain is known as translation.
• Proteins are assembled on a ribosome– OUTSIDE of the
nucleus (in the cytoplasm)
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Steps of Translation (Overview)1. mRNA travels to the ribosome2. Transfer RNA (tRNA) brings the right amino acid
to the ribosome3. A polypeptide (protein) is formed
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How does tRNA “know” what amino acid to bring?
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The genetic code (mRNA) is read three bases at a time.
Each three-letter “word” is known as a codon.
tRNA “looks” for the codon that pairs with its 3 nucleotide
sequence (called an anticodon).
When it connects the ribosome attaches the amino acid that
tRNA was carrying to the polypeptide chain
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ORDER MATTERS!Order of DNA bases order of RNA bases order
of amino acids what protein is made
tRNA
mRNA
Amino acid
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How to use the Codon Chart:
1. Use the left side to find the first letter in the codon
2. Use the top to find the second letter in the codon
3. Use the right side to find the third letter of the codon
4. Go to where ALL three overlap on the chart
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How to use the Codon Wheel:
1. Begin in the middle with the first letter of the codon
2. Go outward to the second letter in the codon
3. Go outward again to the third letter in the codon.
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Did you notice?: The codon “AUG” can specify methionine or serve as the “start” codon for protein synthesis.
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What codon will tell the ribosome to quit putting amino acids together? What letters code for this?
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Codon Bingo!Directions For Playing:
If a codon (example: AAG) is called out, you must find the amino acid.
If an amino acid (example: serine) is called out, you must find the codon.
Hint! When finding a codon, there may be more than one answer…you can count all possible answers on your card!