First off, What I did on Day ????. (somehow I'll probably remember what day it is and I'll go back and add the missing ones...)
Today we investigated Common Descent with Molecular Biology.
We were trying to compare the relatedness between organisms by examining the amino acid sequence in the protein, Cytochrome c. By comparing the amino acid sequences between many organisms we were able to determine how closely or distantly organism A was from Organism B.
We discovered that the Horse and Cow had only 3 differences, which makes sense since they look similar, share similar bone structure, walk on 4 legs...etc.
We also discovered that a whale and a moth had 22 differences. Which shocked me, for I thought there would be more of a differences. One was a mammal, while the other was a tiny bug. This just shows how close everyone is... creepy.
Quiz: https://docs.google.com/file/d/0B_nnOJLj_iJAaFVCUWxHelRvM1E/edit?usp=sharing
1. The evidence supports that the Mesonychid was an ancestor of the Basilosaurus, because of anatomical similarities. Both appear to share the "1 bone 2 bone blob" structure."
2. marsupials appear to have began on the continent North America. (e).
3. Bats, Birds, and Dragonflys all share analogous structures, wings. Although they all have wings, with basic similarities, light weight and large length, the underlying structure is completely different. This shows that they have evolved from different ancestral structures. It shows convergent evolution, where the independent evolution of similar features appears in different lineages.
4. The Common Descent lab focused on Amino acid sequences. By comparing the differences in amino acid sequences in cytochrome-c from 20 different species side by side, we were able to observe which species shared similarities and differences, thus allowing us to infer that some species shared near common ancestors. With the Rhesus Monkey and the Human's amino acid sequences there was only 1 difference on amino acid number 66. This shows that the Rhesus Monkey and the Human are very closely related, and have shared a close common ancestor. It also shows that our structures and organs may be similar.
5. Homology is the study of similar structures in different organisms that can show a common ancestor. Some examples would be the 1 bone, 2 bone, blob structure that is found in many organisms. It is found in the Bat, the whale, the Human, the seal, the lion and even the orangutan. This shows that all these species shared a common ancestor at one point. (we are all mammals!)
Friday, September 27, 2013
Wednesday, August 28, 2013
BBlockBonds
On Monday August 26th, Our B block bio class did some handouts!
There were two handouts, one on ionic and covalent bonds, and the other on making molecular models.
I picked the better one: making molecular models.
So, for this handout, we were given a Molecular model kit, some colored pencils, and a periodic table.
We were asked to record the # of atoms, make a model, color the model, and draw a dot structure for each formula. We also needed to know if the compound was polar or non-polar.
Here is some of our work:
Lastly, we have our C6H12O6, otherwise known as Glucose.
Glucose is 6 oxygen atoms each attached to a carbon molecule, with a hydrogen attached to each carbon and to each oxygen. Glucose is a polar molecule, and has a total of 24 atoms.
Through this handout, we were able to visualize atomic bonding, represent atomic bonding using dot diagrams, and predict and classify bonds as either polar or non polar.
There were two handouts, one on ionic and covalent bonds, and the other on making molecular models.
I picked the better one: making molecular models.
So, for this handout, we were given a Molecular model kit, some colored pencils, and a periodic table.
We were asked to record the # of atoms, make a model, color the model, and draw a dot structure for each formula. We also needed to know if the compound was polar or non-polar.
Here is some of our work:
 |
| Our Hydrogen Model (H2) |
Above, is a picture of our H2 Model. In a hydrogen molecule, there are 2 atoms, both hydrogen, who form a covalent bond by sharing their only atoms together. Because both atoms are the same, and that there is no difference in electronegativity, they form a non polar relationship.
 |
| Our Water Molecule (H2O) |
Secondly, this is a picture of our H2O molecule, otherwise known as water. Because oxygen only has 6 valence electrons, it needs two more. So along with the 2 Hydrogen molecules, each sharing one of their electrons, H2O becomes an octet. Water is one oxygen forming 2 covalent bonds with 2 hydrogen atoms.
Unlike the hydrogen bond above, Water is polar due to the two hydrogen atoms.
Glucose is 6 oxygen atoms each attached to a carbon molecule, with a hydrogen attached to each carbon and to each oxygen. Glucose is a polar molecule, and has a total of 24 atoms.
Through this handout, we were able to visualize atomic bonding, represent atomic bonding using dot diagrams, and predict and classify bonds as either polar or non polar.
Saturday, August 24, 2013
Dancing Milk
Hi!
Welcome to my blog!
Today my lab partner and I formed an experiment to test the out hypothesis on the Dancing Milk lab video.
In this video, a drop of dish soap is dropped onto a thin plate of milk, with a couple of food coloring drops on top.
Once the dish soap was dropped, the food coloring began to spread out throughout the milk in a fast reaction.
As a group, Elisa and I formed a hypothesis as to why the food coloring reacted the way it did. We formed a hypothesis that the chemicals in the dish soap broke down the lipids and fat bonds in the milk causing them to move around, which was visible to us due to the food coloring.
We recreated the lab, using the same materials; however, we switched the milk with different types of milk to see if the reaction would happen the same.
In the end,
we noticed that the dish soap for all liquids we tested, 2% milk, whole milk, and skim milk did react the same. Proving our hypothesis that the dish soap broke down all the fat in all of these and caused the food coloring to react the way it did.
In this video, a drop of dish soap is dropped onto a thin plate of milk, with a couple of food coloring drops on top.
Once the dish soap was dropped, the food coloring began to spread out throughout the milk in a fast reaction.
As a group, Elisa and I formed a hypothesis as to why the food coloring reacted the way it did. We formed a hypothesis that the chemicals in the dish soap broke down the lipids and fat bonds in the milk causing them to move around, which was visible to us due to the food coloring.
We recreated the lab, using the same materials; however, we switched the milk with different types of milk to see if the reaction would happen the same.
In the end,
we noticed that the dish soap for all liquids we tested, 2% milk, whole milk, and skim milk did react the same. Proving our hypothesis that the dish soap broke down all the fat in all of these and caused the food coloring to react the way it did.
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