Lesson 2: DNA/RNA structure, Triplet codes

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Presentation transcript:

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

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

Starter Activity Can you draw a DNA nucleotide?

DNA Nucleotide

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

Bases: Adenine Guanine Cytosine Thymine PUrines Pyrimidines

How is RNA structure different to DNA?

RNA:

Protein Synthesis

mRNA = Messenger RNA

Protein Synthesis Overview: http://www.youtube.com/watch?v=VGxQIQpP74w Episodes 1, 3.

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

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.)

Base Pairings A T C G A U

Human Demonstration Pick a card…

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

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

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

Booklets…

Transcription Open University Video. Episodes 4+

DNA /RNA Structure words