1. Lesson 2: DNA/RNA structure, Triplet codes
Unit 18: Genetics
Lesson 2: DNA/RNA structure, Triplet codes

2. Lesson Objectives To know the structures of DNA and RNA
To be able to translate DNA triplet codes into mRNA codons

3. Starter Activity
Can you draw a DNA nucleotide?

4. DNA Nucleotide

6. What are the other bases called?
Adenine
Thymine
Guanine
Cytosine
Uracil

7. Bases:
Adenine Guanine Cytosine Thymine
PUrines
Pyrimidines

8. How is RNA structure different to DNA?

9. RNA:

10. Protein Synthesis

11. mRNA
= Messenger RNA

12. Protein Synthesis Overview:
Episodes 1, 3.

13. Transcription First stage of Protein Synthesis.
A section of the DNA molecule is ‘un-zipped’
This section is a gene.

16. Transcription:
Once the DNA molecule has ‘exposed’ the gene by unwinding the DNA, transcription begins.
Free nucleotides, begin matching up with base pairs on the DNA molecule to produce an mRNA strand.
(Remember: RNA contains
Uracil instead of Thymine.)

17. Base Pairings A T C G A U

18. Human Demonstration
Pick a card…

19. Now a written exercise…
DNA STRAND 1 A T C G
DNA STRAND 2

20. Now a written exercise…
DNA STRAND 1 A T C G
DNA STRAND 2
mRNA STRAND

21. Now a written exercise…
DNA STRAND 1 A T C G
DNA STRAND 2 A U C G
mRNA STRAND

22. Booklets…

23. Transcription
Open University Video. Episodes 4+

24. DNA /RNA Structure words