Wednesday, October 26, 2011
Wednes-Day 2
AP Chem - did our final and marathon problem of this unit, which incorporated most/all of the quantitative aspects of gases/stoichiometry. This question did not have the qualitative gas law explanations, so be ready to explain any of the gas laws EXACTLY as documented in class, complete with illustrations.
Bio - we drew out the structure of part of a DNA molecule (which coils around histone proteins to make up your chromosomes) both before DNA replication, and after replication, showing the enzyme-aided unzipping of the DNA molecule, and the complementary base pairing that enables two perfect replica DNA molecules to form from one DNA molecule. We noted that, even though the DNA replicates, the number of chromosomes STAYS THE SAME because the number of centromeres is still the same; the net result of the DNA replication is just that each chromosome now is made up of two chromatids instead of just one chromatid.
In 7/8 :We then viewed an animation of the entire cell cycle, and noted the important stages of interphase, and the important stages of mitosis (and the features of each stage).
Bio - we drew out the structure of part of a DNA molecule (which coils around histone proteins to make up your chromosomes) both before DNA replication, and after replication, showing the enzyme-aided unzipping of the DNA molecule, and the complementary base pairing that enables two perfect replica DNA molecules to form from one DNA molecule. We noted that, even though the DNA replicates, the number of chromosomes STAYS THE SAME because the number of centromeres is still the same; the net result of the DNA replication is just that each chromosome now is made up of two chromatids instead of just one chromatid.
In 7/8 :We then viewed an animation of the entire cell cycle, and noted the important stages of interphase, and the important stages of mitosis (and the features of each stage).
# posted by C @ 5:34 PM 
