3.2.2 DNA

1
3.2.2 DNA

• L.O
• To extract and observe DNA
• To describe how bases code for proteins
• To explain how DNA was discovered to be the
  hereditary material
• Starter From last lesson, remember which base
  pairs with which, and then complete the table

of each base of each base of each base of each base
A C G T
Yeast 32 18
TB 35 15
Locust 29 21
Human 19 31
2
Triplets

• A sequence of 3 bases is known as a triplet and
• codes for 1 amino acid.
• The order of the bases in DNA determines the
  order of amino acids, which then codes for a
  protein. Link to BIOL1 levels of protein
  structure
• Decode these triplets to read a message
• ATG ATA TCT TCC
• TCA GCA TAT TCG
• CAC ATT
• 2. Then write a message back!

3
Key Features of the Genetic Code

• It is universal
• It is non-overlapping
• It is degenerate

4
Hershey-Chase Experiment

• http//highered.mcgraw-hill.com/olc/dl/120076/bio2
  1.swf

5
Genetics Glossary

• Complete as many of the 27 terms as you can!
• Hint The glossary is in alphabetical order

6
Plenary

1. What do you know now that you didnt know 60 mins
   ago?
2. How could you best demonstrate your new knowledge
   about DNA?
3. What do you think we might learn next lesson?