USABO Open Exam 2006 Questions And Answers

USABO Open Exam 2006 Questions And Answers Insulin injected by diabetics to control blood sugar levels is derived from bacteria whose DNA has been modified by the addition of the human gene for insulin, which is then produced by the prokaryotes. This is an example of: A. acid therapy. B. cloning. C. genetic engineering. D. gene therapy. E. pluripotency. - ANS C. genetic engineering. Isolated RNA molecules are generally less stable than DNA at physiological pH because: A. RNA has ribose. B. RNU is always linear. C. RNA has U instead of T. D. RNA is usually single stranded. E. there are many more RNAse enzymes. - ANS A. RNA has ribose. Which of the following molecules is able to cross the lipid bilayer? A. antibodies B. ATP C. insulin D. Na+ E. steroid hormones - ANS E. steroid hormones If the rate constant of a first order reaction that converts substrate S into product P is 0.693 min -1 then what is the half life of the reaction? A. 0.010 min B. 0.346 min C. 0.693 min D. 1.000 min E. 1.440 min - ANS D. 1.000 min