CEM131 Grades

The grades for CEM131 are posted for Post Exam 2.  There was a formatting error in the one I showed the morning class which had some grades screwed up.  I have corrected the error, but please double check against your handed back work.

BIO161 Final Grades

Below are the final grades for BIO161.  There was not a curve due to the high median (in the eighties), but this is in line with course policy.  Overall performance was good, and the cladograms didn’t make me cry.

Congrats and good luck, don’t forget the student evals.  You won’t hurt my feelings, I’m sure ex-girlfriends have said much worse about me.

FINAL GRADES BIO161

CEM131 Issue with Problem

While I am grading the exam I noticed that I didn’t use the final (corrected) form of one problem and left a typo in that makes the problem unsolvable.

42. Iodine-131 is used to image thyroid tissue to determine the presence of thyroid cancer.  Iodine-131 degrades through a beta followed by gamma mechanism.  Determine the final product that is produced by the decay of iodine-131.  If you can make a 2.0 mCi/ml solution of iodine-131 how much would have to be made 72 hours before the test (half-life: 8 hours) to make a solution with an activity of 7.4 x 10^3 Bq/ml for the test?

The last unit should have been in Bq, not Bq/ml.  The question makes no sense at the end with the volume in the unit.  However, much of the problem is solvable.  So for the five points I will divide it as follows.  One point for the decay equation.  One point for the conversion of mCi/ml to Bq/ml or Bq/ml to mCi/ml. One point for the determination of the number of elapsed half-lives.  If you made an effort at those you will get the last two points (even if you lost some in the previous three) for what would have been determining the amount of radiation needed and then the volume of stock needed.  However, if you did not attempt the problem, or only trivially addressed it, you will not get the two final points.

My apologies, I pulled up an old draft when I printed it out.

Grades for CEM131

I have finished the first grade set for CEM131.  However, you will have to wait till Monday to get your student number.  The class median on the exam was a 79%, so there was no curve.  In addition, a number of students scored greater than a 90% on the exam.

CEM131 Post Exam 1 PDF

You need a student number to really find your grades, though you could probably do it with your quiz grades if you tried.