Today was a more laid back day in biology class. Basically we reviewed what we went over on Friday and took a few notes on our next section; the early history of earth. Basically all we got was that when the earth was first formed which was about 4.5 billion years ago, the atmosphere was composed of CO2, N2, water vapor, CH4, and H25. The first organic molecules were proven to exist if the atmosphere was as how it was believed to be. Two scientists proved this by conducting an experiment. In it they reproduced the conditions of what the atmosphere was believed to be like in ancient earth. They then sent electric sparks into the solution as if it were lightning. They next took a sample of the water that had formed and let it sit. After about two weeks, amino acids had started to form. this proves that if the atmosphere was what it was in the experiment then that's how the amino acids formed, starting a chain effect that would eventually lead to the development of DNA and RNA.
We did a short lab to demonstrate radioactive decay. We took 100 m&m's in a cup and shook the cup for 10 seconds. We then poured out the m&m's onto a plate and removed all the ones with the m symbol facing up. we the put the m&m's remaining back into the cup and repeated the earlier steps until there was none left. If you looked at the chart we filled out it would show that about each time we removed m&m's there was about half of them left this saying that the 10 seconds was like the half life of the substance that the m&m's represented.
The HW is...-UP 31 and 32
- 2.6 and check my understanding chart (due Wednesday)
-work on your TV add
-test Friday!!!!
The next scribe will be......... Mirella!!!
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