Question

17. Which structure is found in RNA, but would be the result of a mutation or faulty annealing in DNA? A. Hairpin B. Double-stranded helix C. Cruciform D. Sequence complementation E. Bulge 18. A graduate student carefully heated DNA to about 80*C and then prepared it for electron microscopy. She observed a number of small open loops of DNA. What conclusion did she correctly make from her observation? A. The open loops contain DNA mutations, such as cyclobutane dimers and deaminations. B. The denatured DNA is the site of genes, of coding regions, and the annealed DNA is the site of non-coding DNA. C. The open loops contain DNA with a high A-T content. D. The open loops contain denatured DNA that is being transcribed. E. The open loops are plasmids, and the annealed DNA is genomic. 19. Sanger sequencing was performed on DNA from chloroplasts of a new plant species discovered in the rain forest of Puerto Rico. The X-ray film showed bands in the A, C, and T lanes, but the G lane was blank. What is the most likely explanation for this unexpected result? A. ddG was not added to the reaction tube. B. Different template DNA was added to the reaction tube. C. The template DNA contained no G. D. All 4 ddNTPs were added to that tube. E. The template DNA contained no C. 20. Which of the following is not a nucleotide? B. FADH2 C. ATP A. Coenzyme A E. All of the above are nucleotides. D. Anti-cytidine monophosphate 21. Telomeres are non-coding sequences on the ends of chromosomes. They contain a high concentration of guanosine. Given this information, what other structure may be in telomeres?

Answer 1

17) Bulge structure is found in RNA , but can be result of a mutation or faulty annealing in DNA.

18) c) the open loops contain DNA with high A - T content.

20) E) all of the above are nucleotide.

19)A) ddG was not added to the reaction tube.