48 real lab ex1 F07 key copy

48 real lab ex1 F07 key copy - Biol o gy 1 A La b Ex am#1...

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Fall 2007 Lab exam 1 Key Biology 1A - Lab Exam #1 – Oct. 19 th , 2007 Answers Exam 1 Bio 1A, Fall 2007 1 C 6 D 11 B 16 B 21 E 26 B 2 C 7 A 12 E 17 A 22 D 27 C 3 B 8 B 13 A 18 E 23 D 28 A 4 D 9 E 14 A 19 C 24 A 29 A 5 D 10 C 15 D 20 C 25 B 30 B Mean =66.2, STDEV = 15.4. A grade X 83, A- 79-82.5, B+ 73-78, B 69-72.5, B- 65-68.75, C+ 62 - 64.75, C 57 – 61.75, C- 50-56.75, D+ 47.5 – 49, D 44 – 47, D- 41.5-43.5, F X < 41. 2) Acetone separates pigments from their associated proteins and normal resonance energy transfer can not occur. 3) Once the chromatids separate they are chromosomes. Thus during anaphase you double the number of chromosomes to 8 and this is 2 times as much DNA as before (2C). 5) In the presence of methylamine no proton gradient can be established and no ATP can be made via chemiosmosis. 6) Since the cell is G2 this means 4C thus a sperm would have 0.6 X 10 -12 grams of DNA. 0.6 X 10- 12/600 grams/mole bp = 0.1 X 10 -14 moles bp and then times 6.0 X 10 23 = 0.6 X 10 9 = 6.0 X 10 8 . 7) Note the units. The activity doesn’t change per ng of enzyme (as long as you have excess substrate).
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