1. UV light damages DNA by the formation of pyrimidine dimers. Draw the detailed chemical structure of a pyrimidine dimer and explain why the formation of such aberrant structures results in tumor-enabling genomic instability. 2. Use your own words to define ultraviolet light. Include a comparison of naturally-occurring vs artificial UV. What is UV-A? UV-B? UV-C? Which one(s) is (are) the most damaging to DNA? Why? Which one(s) are most likely to lead to a mutation in skin cells? Why? What type of UV light is used in tanning beds?

1. UV light damages DNA by the formation of pyrimidine dimers. Draw the detailed chemical structure of a pyrimidine dimer and explain why the formation of such aberrant structures results in tumor-enabling genomic instability. 2. Use your own words to define ultraviolet light. Include a comparison of naturally-occurring vs artificial UV. What is UV-A? UV-B? UV-C? Which one(s) is (are) the most damaging to DNA? Why? Which one(s) are most likely to lead to a mutation in skin cells? Why? What type of UV light is used in tanning beds?

Essentials of Pharmacology for Health Professions

7th Edition

ISBN:9781305441620

Author:WOODROW

Publisher:WOODROW

Chapter14: Antineoplastic Drugs

Section: Chapter Questions

Problem 11CRQ

See similar textbooks

Similar questions

Which of the following statements are true regarding the properties of DNA and RNA polymerase. Select all that apply. Both DNA and RNA polymerase synthesize nucleic acid strands in the 5" to 3' direction. Both DNA and RNA polymerase can initiate strand synthesis on their own. I. RNA polymerase initiates strand synthesis, while DNA polymerase depends upon an existing strand to continue synthesis. II. RNA polymerase only uses ribonucleotides for strand synthesis. DNA polymerase only uses deoxyribonucleotides for strand synthesis. V. Au DNA and RNA polymerases from eukaryotes behave very differently from DNA and RNA polymerases found in prokaryotes. O VI.
a. Write the reaction that proves that UV attacks DNA.b. What is a base stacking interaction? How does it help DNA?c. Explain the Sanger method in detail.
5. Von Gierke's disease results from the lack of glucose-6-phosphatase (G6Pase) activity. This causes an increase concentration of glucose-6-phosphate. One of the effects of this disease is gout. Describe how elevated levels of glucose-6-phosphate would lead gout. I ÍI.- --- 6. Replication is the process by which we replicate DNA. This process requires the two strands of DNA to be separated in order for replication to occur. How does having the DNA underwound help facilitate the separating of the DNA strands?
Some antibiotic drugs fight infection by interfering with DNA replication, transcription, or translation in bacteria. Indicate whether each of the following antibiotic drug effects is on replication, transcription, or translation. HINT Each answer (replication, transcription, and translation) is used only once for the following: a. Rifampin binds to bacterial RNA polymerase. b. Streptomycin binds bacterial ribosomes, disabling them. c. Quinolone blocks an enzyme that prevents bacterial DNA from unwinding.
1.Photoreactivation is called a direct reversal of DNA damage. Mismatch repair, Nucleotide excision repair and base excision repair correct DNA mismatches and damaged bases, but these systems are not considered direct repair. what two general steps do these indirect repair systems have in common?.
1.2 A colony of bacterial cells is exposed to UV-light. 1.2.1 What mutation will probably result from the exposure? (1) 1.2.2 Which repair mechanisms can be used by the cell to repair the mutation? (2)
Provide a detailed description and hand drawn figure of each of the following. (1) Mismatch Repair (2) Nucleotide-Excision Repair
1. The SARS-CoV-2 virus (causing Covid-19) has an RNA genome, which is replicated using an RNA-dependent RNA polymerase (RdRp). The structure below shows a drug that was recently developed as a treatment for infection with SARS-CoV-2 (a) Which molecule normally found in a cell does it most resemble? (You can ignore the part of the structure highlighted with a red box. This is removed by hydrolysis when the drug enters the cell). (b) Suggest a mechanism by which this molecule might inhibit infection. (c) Why is this drug unlikely to have major effects in the host? HN OH OH
1. Describe the process of autophosphorlyation 2. Differentiate between chromosomes and genes. 3. Think about what happens at the replication fork. If the gene for helicase is mutated, what part of replication will be affected and how? 4. There are three common types of chemical changes that can damage DNA at any time post-replicatively. In basic terms, name and describe any two of the three types of damage. please help me quick
2. For each DNA repair process in column I, list all characteristics from column II that correctly describe that process. I II 1. RecA protein participates. 2. Damaged nucleotides are removed by nick translation (a) Nucleotide excision repair (b) Photoreactivation (c) Base excision repair (d) Recombinational repair (e) SOS-driven error-prone repair (f) Alkyltransferase repair (g) Mismatch repair (h) Double-strand break repair 3. A free radical mechanism is involved. 4. The repair enzyme functions only once. 5. The key enzyme contains a bound folate cofactor. 6. No bases or nucleotides are removed from the DNA. 7. Deficiency of this enzyme in humans greatly increases the risk of skin cancer. 8. This system is chiefly responsible for the mutagenic effect of ultraviolet light. 9. The first enzyme in this pathway cleaves two phosphodiester bonds. 10. This process begins up to 1 kbp away from the site to be repaired. 11. DNA ligase catalyzes the final reaction. 12. This process also occurs…
6a. Given the following mutated sequence (with respect to the normal sequence), what TYPE of mutation occurred: AAGCTTAC
a. As a result of the structure of DNA and RNA, replication, transcription and translation are possible. What can nucleic acids do, as a result of their structure, that enables these processes to occur? The figure below shows a simplified schematic representation of a segment of DNA. The DNA is labelled with the numbers 1 – 14 for easy reference. -35 sequence Pribnow box 5' UTR 3' UTR DNA TTGACA TATAAT -35 -10 Gene a Gene B Gene y 1 2 3 4 5 6 7 8 9 10 11 12 13 14 UTR = untranslated region b. At which position on the DNA (number 1 - 14) will transcription be initiated? c. At which position on the DNA (number 1 - 14) will the first signal for translation be found? d. Between which two regions on the DNA will the polyadenylation signal be found? Use the numbers to indicate the region. e. Between which two regions on the DNA will the first Shine-Dalgarno / Ribosome Binding Sequence be found? Use the numbers to indicate the region.