exam 2 gene - GENE 3200 MWF - Fall 2009 Exam 2 Bedell Oct...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
GENE 3200 – MWF - Fall 2009 Exam 2 – Bedell – Oct 15 ID no. 810___________________________ 1 Write your ID number (810 number, NOT SSN) on every page. Write your initials on the first page only. All of the multiple choice questions have only one correct answer. The exam should be completed in ink. Regrades will not be given if you write in pencil. All requests to re-grade an exam must be made in writing to Dr. Bedell within 48 hours of the grades being posted on WebCT 1. (3 pts). For three of the five bases, write the correct names below the structure. 2. (2 pts). If 35% of the bases in mouse DNA are G, what percentage of the bases are T? 3. (2 pts). In a strand of DNA, a ________ bond connects the phosphate group of one nucleotide to the sugar of the adjacent nucleotide. A. hydrogen B. phosphodiester C. disulfide D. phosphate E. ester F. none of the above 4. (3 pts). When Meselson and Stahl performed their experiments on DNA replication, they grew cultures of E. coli in a heavy isotope of nitrogen ( 15 N), then transferred cultures to a light isotope of nitrogen ( 14 N) and allowed the cultures to grow in the latter for one or two generations. If replication occurred through a dispersive process (and not a semiconservative process), which of the following results would they have obtained? A. The 1st generation would have heavy DNA only , and the 2nd generation would have light DNA only B. The 1st generation would have intermediate density (hybrid) DNA only , and the 2nd generation would have intermediate DNA only but no light density DNA. C. The 1st generation would have intermediate density (hybrid) DNA only , and the 2nd generation would have both intermediate and light density DNA. D. The 1st generation would have heavy DNA only , and the 2nd generation would have both heavy and light DNA but no intermediate density DNA. 5. (2 pts). During initiation of DNA replication in cells, unwinding the double helix to separate the parental strands requires which of the following? A. primase B. helicase C. DNA ligase D. topoisomerase E. DNA polymerase F. telomerase 6. (3 pts). If 5'-AGATACTCGACCTGATTC-3' is part of an origin of replication and 5'- AGGUCG-3' is used to prime DNA synthesis from this strand, what are the first 6 nucleotides of newly synthesized DNA? Be sure to write the 5' and 3' ends.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
GENE 3200 – MWF - Fall 2009 Exam 2 – Bedell – Oct 15 ID no. 810___________________________ 2 7. The structure shown below is a replicating region of DNA, with the arrows indicating newly- synthesized DNA. The vertical gray lines indicate complementary base-pairing between the template strands of DNA. On the figure, clearly label each of the following components: A. (1 pt). The 5' and 3'ends of both template strands. B.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

exam 2 gene - GENE 3200 MWF - Fall 2009 Exam 2 Bedell Oct...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online