Topic 4A- DNA, RNA and Protein Synthesis

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  • Created by: Naoibh
  • Created on: 11-04-16 19:54
A Drug inhibits cell growth is found to be able to bind to DNA , preventing DNA polymerase from binding. Explain how this drug will effect protein synthesis (2 Marks)
drug binds to DNA ,preventing RNA polymerase from binding
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Descibe the role od RNA Polymerase in the transcription of a gene sequence(2 Marks)
RNA polymerase lines up free RNA nucleotides along exposed bases on DNA template strand (1) enzyme moves across DNA assembling complementary mRNA sequence from RNA nucleotides by joining them together (1)
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The mRNA for the gene coding for the antibiotic is the same length as its DNA. Explain how and why this might be different for a eukaryotic gene(3 Marks)
Genes in eukaryotic DNA contain introns (1) After transcription introns are removed from pre-mRNAstrands by splicing leaving only exons which from mRNA(1) eukaryotic mRNA would be shorter than DNA it was transcribed (1)
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What is the genetic code (1Mark)
Sequence of base triplets/codons in mRNA which codefor specific amino acid
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The genetic code is determined as universal and degenerate. Explain what these terms mean(2 marks)
Same specific base triplets code for the same amino acids in all living things (1) degenerate because possible combinations of triplets than amino acids(1)
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Name the organelle that mRNA attatches to for translation (1 mark)
Ribosome
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Describe how the structure of mRNA difers from tRNA
tRNA is folded into a clover shape and held together with hydrogen bonds whereas mRNA is not. (1) Three adjacent bases in mRNA forms codon whereas tRNA has three specific bases called an anticodon(1) tRNA has amino acid binding sitebut mRNA dont
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Card 2

Front

Descibe the role od RNA Polymerase in the transcription of a gene sequence(2 Marks)

Back

RNA polymerase lines up free RNA nucleotides along exposed bases on DNA template strand (1) enzyme moves across DNA assembling complementary mRNA sequence from RNA nucleotides by joining them together (1)

Card 3

Front

The mRNA for the gene coding for the antibiotic is the same length as its DNA. Explain how and why this might be different for a eukaryotic gene(3 Marks)

Back

Preview of the front of card 3

Card 4

Front

What is the genetic code (1Mark)

Back

Preview of the front of card 4

Card 5

Front

The genetic code is determined as universal and degenerate. Explain what these terms mean(2 marks)

Back

Preview of the front of card 5
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