Test!

Next, class we had a test on Unit 1. It was on diffusion and osmosis, basic chemistry, properties of water, organic compounds, etc. It was okay.  

class #8

During class, we reviewed for our upcoming test. We reviewed properties of water, basic chemistry, diffusion and osmosis, cell membrane, its structure and functions, organic compounds, and macromolecules. We also went over structures of formulas.

After reviewing, we took a quiz which really prepared us for the test. Right as I was turning in my quiz, the fire alarm went off. What timing. Soon we were evacuated because there was a huge fire next to campus. It was a very eventful day. 

 

Who took Jerell's Ipod?

For this class we were given the option to choose between two labs, and I chose Who took Jerell's Ipod. I thought it world be interesting solving a mystery with science. For this lab we were reviewing the concepts of organic compounds and macromolecules. An organic compound is any member of a large class of gaseous, liquid, or solid chemical compounds whose molecules contain carbon and hydrogen. Macromolecules, large complex compounds with relatively large molecular weight, in organic compounds are carbohydrates, lipids, nucleic acids, and proteins. 

For this lab, we were testing vegetable oil, glucose, starch form corn or potatoes, powdered egg whites, and water for glucose, starch, proteins, and lipids. We then tested pretzels, butter, jelly, fat free yogurt, beans, and our evidence for glucose, starch, proteins, and lipids. If our results for the evidence matches up with any of the results of the food, we will know who the culprit is. In our case, our evidence matched up with fat-free yogurt, showing us that Ashley was the culprit! To read more in detail about the lab, how to do the tests, and our results, visit my website and read my lab report-https://sites.google.com/site/tanyamalikhonbio/who-took-jerell-s-ipod

Class 6

For class 6, we went over the cell membrane and its structure and function, and a little bit about our house case #1.

The cell membrane is a semi-permeable layer that acts as a "gate keeper" for the cell. It separates the interior of the cell form the outside environments. All living organisms, except viruses, have cell membranes. They can regulate what goes inside and out of the cell based on molecular size and if it is polar or non polar. Cell membranes are made up of thin layers called phospholipid bilayers. Proteins in the membrane transport molecules, chemicals, and information across it. Glycoproteins are important cell membrane proteins because they help with cell to cell recognition.
In animal cells, if the cell and the solution are not isotonic (reached equilibrium) then the cell membrane can burst if there is too much pressure. In plant cells, since there is a cell wall, if there is a lot of pressure exerting from the inside of the circle, the cell wall will exert equal pressure, and the cell membrane will not burst.

 

For House Case #1, we discussed as a class what we thought our diagnosis were. Mine were heat stroke, concussion, and sleep deprivation. We were able to ask Mr. Quick questions about the patient and his medical history. We were also able to request certain tests to be performed. At the end of the class, we were given the results and told for homework to figure out what the patient had. I suspected that he suffered from hyponatremia (over hydration). To read more about my house case #1 go onto my website- https://sites.google.com/site/tanyamalikhonbio/

Diffusion Lab Class #5

Diffusion is the net movement of molecules down their concentration gradient, and it occurs in solids, liquids, and gases. Even though the movement is down the concentration gradient, the molecules can move in any direction as long as the membrane is permeable to the molecule.

On the 4th of September, we explored this topic by performing two labs. In the first lab, we first created "cells" from dialysis tubing containing 15% glucose and 5% starch (8ml). Then we tested them with glucose strips. Then we added 1ml of iodine to test for starch presence. The higher concentration iodine moved into the lower concentration solution in the "cell". Then after 15 minutes, put the cells un a cup with 1ml of Benedict's on a hot plate. This tests for glucose presence.

For the second lab, we had three pieces of differently cut NaOH. First we measured the surface area of the cubes. Then we placed them in beakers full of water and then added a solution. After a couple minutes, we took the cubes out and re-measured the surface area. We observed that the cubes changed from a white color to a pinkish color. Diffusion took place because the molecules moved from the higher concentration solution to the lower concentration NaOH. However, the cubes were not fully pink in the center because we took them out too early enough for diffusion to happen thoroughly.

 





  

Paleontology Project

Here is the link to my and Alessandra's Paleontology Project:

https://sites.google.com/site/thediscoveryofgomphoiatandra/

Even though this project took a long time to finish, I really enjoyed working on it. It is by far the most fun project I have ever done in school. I hope we get to do more things like this in the future! :D 

Evidence for Evolution Quiz #1

1. The picture for question 1 is evidence for evolution because it shows that species are always changing. The species evolved from a wolf/bear like creature to a whale life creature because the species needed to adapt to its changing environment. Many factors play into why the species needed to adapt. Either there was an abundance of food in the water, or the animals were trying to escape a predator. Through these factors, the species changes over time, such as new bone structures, and the species transforms into a whole new one.   2. Marsupials evolved from North America. Then they migrated to South America and then to Australia. The answer is E.  3. The Dragon fly, the bird, and bats are all animals from different lineages. But, they all have analogous structures that have similar functions. This is called convergent evolution. They have all evolved the capability of flight independently. They have all "converged" this trait. Their bone structures are different but it has similar uses. 

4. The Common Ancestry Lab shows evidence for evolution through the DNA of the common ancestor, gorillas  chimpanzees, and humans. They all have similarities, or matches, and differences. This shows us that gorillas, chimps, and humans are related. The gorilla is closely related to the chimp, and the human is closely related to the human. 

5. Homology is when animals have similar bones structures but different uses for them. For example from inner fish we can lear that humans, dogs, birds, and whales have similar bone structure in the are but we all use it for different reasons.