13. An investigator is studying epigenetic markers in patients with retinoblastoma. It is most appropriate for this investigator to focus on which of the following enzymes? A) DNA methyltransferase B) DNA polymerase C) Helicase D) RNA polymerase E) Topoisomerase
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![13. An investigator is studying epigenetic markers in patients with retinoblastoma. It is most appropriate for this investigator to focus on which of the following enzymes?
A) DNA methyltransferase
B) DNA polymerase
C) Helicase
D) RNA polymerase
E) Topoisomerase](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc600b0d5-f546-4737-8728-f3811232eff5%2F5d6b6d5d-e12f-46e0-97ed-525521fbdaf4%2Fj92y2n5_processed.png&w=3840&q=75)
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- Label these processes 1-8 (1 being the earliest time point) in the order they would occur during expression of a eukaryotic gene. a) Regulatory transcription factor binding at an enhancer b) transcription initiation c) Phosphorylation of the gene's protein product d) MRNA nuclear export e) general transcription factor binding to promoter f) chromatin remodeling to expose promoter g) splicing h) translation initiationHow does the presence of epigenetic modifications affect the accuracy and reliability of genetic analysis techniques such as DNA sequencing and PCR (Polymerase Chain Reaction)?1) Assume you have an operon that is repressible. In this case, the rate of synthesis of repressor protein must depend on the level of a) co-repressor b) inducer c) both d) neither
- What is meant by biotransformation?Describe what would happen to the lac operon in a low-lactose environment and in a high lactose environment. a) How will each of these environments affect gene expression? b) What would happen to the repressor in each case? c) How will each of these environments affect RNA polymerase?7) The tryptophan operator a) is an allosteric protein. b) binds to the tryptophan repressor when the repressor is bound to tryptophan. c) is required for production of the mRNA encoded by the tryptophan operon. d) is important for the production of the tryptophan repressor. Page 2 of 6
- 15) Why are viruses an ideal candidate for gene delivery in gene therapy? a) What are TWO limitations of viruses as gene delivery vectors in gene therapy?Expression of a gene, in terms of greater production of the protein it encodes, could be increased by ... Question 12 options: A) increasing transcription of that gene. B) inhibiting proteases that break down the protein it encodes C) increasing the half life of its mRNA transcript D) A and C E) A, B and CThere may be more than one answer for each Expression of mRNA can be regulated by which of the following? a.) RNA interference b.) presence of vectors c.) antisense RNA d.) blocking of poly(A)polymerase Which of the following occur during processing of pre-mRNA? a.) removal of exons b.) removal of noncoding sequences c.) addition of 5’ cap structure d.) addition of poly-A tail