Selekt1234
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#1
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#1
There is a 6 marker on describe the process of transcription wirte i dont which one to say
DNA Helicase unwinds the double
strand.
-RNA nucleotides complimentary
base pair with the DNA template
strand.
-Thymine bases are replaced with
uracil in mRNA
-RNA polymerase forms the sugar
phosphate backbone/
phosphodiester bonds.
do you thinks thats good enough for 6 marks
and also should i change DNa helicase to RNA polymerase
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Long Lee Chen
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Your answer seems fine to me
....but just in case i have left a reference of what got me 6 marks in my exam.

Step 1 Double helix is unwinded by DNA helicase and the hydrogen bonds break.
Step 2 Now there are two DNA strands. The template strand will be used for producing mRNA molecules.
Step 3 Free RNA nucleotide are matched up to the bases on the template strand. (DNA polymerase joins RNA nucleotide together) and Thymine bases are replaced with Uracil.
Step 4 mRNA separates from the DNA template.
Step 5 mRNA is transferred out of the nucleus into the cytoplasm ready for Translation.
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Kushaal11
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I think in step 5 you form pre-mRNA which needs to be spliced (removing introns) to form the mRNA molecule.
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Long Lee Chen
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Yes, that is correct.
It also depends on whether you are taking AQA, Cambridge or Edexcel course. I am taking Edexcel and we only learn about removing introns( Controlling gene expression) in unit 2.Which is a separate unit with transcription.
(Original post by Kushaal11)
I think in step 5 you form pre-mRNA which needs to be spliced (removing introns) to form the mRNA molecule.
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Selekt1234
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#5
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should it not be rna polymerase instead of dna polymerase



(Original post by Long Lee Chen)
Your answer seems fine to me
....but just in case i have left a reference of what got me 6 marks in my exam.

Step 1 Double helix is unwinded by DNA helicase and the hydrogen bonds break.
Step 2 Now there are two DNA strands. The template strand will be used for producing mRNA molecules.
Step 3 Free RNA nucleotide are matched up to the bases on the template strand. (DNA polymerase joins RNA nucleotide together) and Thymine bases are replaced with Uracil.
Step 4 mRNA separates from the DNA template.
Step 5 mRNA is transferred out of the nucleus into the cytoplasm ready for Translation.
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Long Lee Chen
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#6
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yes
(Original post by Selekt1234)
should it not be rna polymerase instead of dna polymerase
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