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Genetics Final Fall 2005 pg 9

Genetics Final Fall 2005 pg 9 - ANSWERS 1 D 2 E 3 C 4 A 5 B...

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Unformatted text preview: ANSWERS: 1. D 2. E 3. C 4. A 5. B 6. E 7. C 8. C 9. C 10. D 11. C 12. A 13. A 14. C 15. A 16. B 17. E 18. A 19. B 20. A 21. A 22. D 23. C 24. B 25. D 26. In eukaryotes, first the chromosomes are unwound and made accessible by the action of transcription factors. Pre-transcriptional factors that regulate the rate of transcription are employed here, including activators/deactivators, enhancers/repressors, and the core promoter region upstream from the gene. Once the RNA polymerase is attached to the promoter on the DNA molecule, the pre-mRNA molecule is transcribed by the addition of rNTP’s in the 5’ 3’ direction (moves 3’ 5’ on the template strand). This primary transcript then receives a methylated cap and a poly-A tail. After this, the introns are spliced out of the sequence, leaving only exons; at this point, differential splicing can occur to code for different proteins from the same gene. Once the introns are spliced out, we have the final mRNA molecule which can then be translated into a polypeptide...
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