Transcript 3.2.2 DNA - misslongscience / FrontPage

3.2.2 DNA
L.O:
1. To extract and
observe DNA
2. To describe how bases
code for proteins
3. 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
A
Yeast
32
TB
Locust
Human
C
T
18
35
29
G
15
21
19
31
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**
1. Decode these triplets to read a message:
ATG ATA TCT TCC
TCA GCA TAT TCG
CAC ATT
2. Then write a message back!
Key Features of the Genetic Code
• It is universal
• It is non-overlapping
• It is degenerate
Hershey-Chase Experiment
• http://highered.mcgrawhill.com/olc/dl/120076/bio21.swf
Genetics Glossary
Complete as many of the 27 terms as you can!
Hint: The glossary is in alphabetical order
Plenary
1. What do you know now that you didn’t
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?