Friday, October 30, 2009
Fri-Day 1
Bio 3/6- we reviewed and discussed the three overall purposes of mitosis especially in complex, multi-cellular organisms. We then looked at the final part of our unit: asexual reproduction.
There are FIVE different types of asexual reproduction, ALL of which involve forming genetically identical new cells from the original cells. There is no such thing as male and female in asexual reproduction; there is just one parent cell that is NOT a sex cell.
We saw binary fission that occurs in bacteria, amebas, paramecia, and euglenas. Budding occurs in yeast and hydra. Sporulation in fungi. Regeneration in starfish and planaria. We also discussed THREE types of asexual vegetative propagation, which has the advantage of producing genetically identical offspring of very healthy or delicious plants/veggies/fruits: cutting (as in cutting out the "eyes" of potatoes and planting them), grafting (taking a branch from a seedless orange tree and attaching it firmly to a stem of a healthy orange tree produces more seedless oranges from that branch), and layering (planting part of a vine underground will cause that part of the vine to form a new independent genetically identical plant).
AP Chem- we discussed the requisite definitions to understand Hess's Law. We showed the meaning of enthalpy of formation and gave many examples of various elements in their "standard states" at 1atm and 298 K.
We then showed how and why Hess's Law works by looking at various pathways for a given reaction, seeing that the same NET reaction will always yield the same NET delta H of reaction.
We then applied Hess's Law to get the delta H of reaction from the heats/enthalpies of formation of the reactants and products and their mole coefficients from the BALANCED equation.
The rest of the solutions are in the notes. We will do additional examples next week, of course but you should get started on all of the practice tests, worksheets, and text problems!
See me on Monday about any questions that you cannot solve.
Monday afternoon, I'll give another timed practice test in thermochem and then we'll go over the exam for instant feedback.
There are FIVE different types of asexual reproduction, ALL of which involve forming genetically identical new cells from the original cells. There is no such thing as male and female in asexual reproduction; there is just one parent cell that is NOT a sex cell.
We saw binary fission that occurs in bacteria, amebas, paramecia, and euglenas. Budding occurs in yeast and hydra. Sporulation in fungi. Regeneration in starfish and planaria. We also discussed THREE types of asexual vegetative propagation, which has the advantage of producing genetically identical offspring of very healthy or delicious plants/veggies/fruits: cutting (as in cutting out the "eyes" of potatoes and planting them), grafting (taking a branch from a seedless orange tree and attaching it firmly to a stem of a healthy orange tree produces more seedless oranges from that branch), and layering (planting part of a vine underground will cause that part of the vine to form a new independent genetically identical plant).
AP Chem- we discussed the requisite definitions to understand Hess's Law. We showed the meaning of enthalpy of formation and gave many examples of various elements in their "standard states" at 1atm and 298 K.
We then showed how and why Hess's Law works by looking at various pathways for a given reaction, seeing that the same NET reaction will always yield the same NET delta H of reaction.
We then applied Hess's Law to get the delta H of reaction from the heats/enthalpies of formation of the reactants and products and their mole coefficients from the BALANCED equation.
The rest of the solutions are in the notes. We will do additional examples next week, of course but you should get started on all of the practice tests, worksheets, and text problems!
See me on Monday about any questions that you cannot solve.
Monday afternoon, I'll give another timed practice test in thermochem and then we'll go over the exam for instant feedback.
# posted by C @ 12:36 PM 
