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14.2 polypeptide synthesis - transcription and splicing
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- 1what is the basic process of manufacturing proteins?1) DNA gives instructions in nucleotides and their bases
2) complementary section of part of this is made = pre-mRNA (transcription)
3) pre-mRNA is spliced to form mRNA
4) mRNA = template for complementary tRNA to attach a.a. (translation) - 2what is transcription?the process of making pre-mRNA using part of the DNA as a template
- 3what is the 1st stage in the process of transcription?1. enzyme DNA helicase breaks hydrogen bonds between bases at certain point. this unravels the DNA.
- 4what is the 2nd stage in the process of transcription?2. enzyme RNA polymerase moves along one of the strands causing nucleotides on this strand to join with individual complementary nucleotides from the pool in the nucleus
- 5what is the 3rd stage in the process of transcription?exposed bases pair with complementary bases, but Adenine doesn't bind with Thymine now, it binds with Uracil
- 6what is the 4th stage of transcription?4. as the RNA polymerase adds nucleotides to build pre-mRNA, the DNA strands rejoin behind it so only about 12 bases are exposed at a time
- 7what is the final stage in transcription?when RNA polymerase reaches a stop codon, it detaches.
- 8how is the pre-mRNA molecule modified?it is spliced to remove useless introns, so it is just left with exons, making it mRNA
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- A-Level (14. genetic control of protein structure and function) A2 BIOL5 Fichas sobre 14.2 polypeptide synthesis - transcription and splicing , creado por Charlotte Hewson el 08/03/2016.
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- Charlotte Hewson
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