Finding out the affect of different concentrations of sucrose solution

Finding out the affect of different concentrations of sucrose solution on the mass of potato chips Introduction The aim of this investigation is to see when osmosis occurs in potato cells and whether anything happens to them when they are put in different concentrations of sucrose solution. I have to apply my background knowledge to devise an experiment which will tell me whether if different concentrations of water molecules in a solution will affect the mass of plant cell when they are put into it. Background knowledge Osmosis is like diffusion but only of water molecules and it only happens when there are different concentrations of water molecules on either side of a selectively permeable membrane. The selectively permeable membrane "gaps" are only small enough to let water molecules pass through and not big molecules such as sucrose molecules. Water molecules from each side of the membrane always pass to the other side. When one side of the selectively permeable membrane has a higher concentration of water molecules than the other, more water molecules from the side containing a higher concentration of water molecules will pass through to the side with a lower concentration of water molecules. Less water molecules from the side with a lower water molecule concentration will pass to the other side because there are less of them. If the concentration of water molecules on either side of the selectively membrane is the same then the net flow of water in either direction will be the same. This results in no net flow of water-osmosis. An example of osmosis happening in a plant cell is when a potato chip is put into distilled water. The cell membrane of the potato cells is the selectively permeable membrane between the concentration of water molecules inside the potato cells and the distilled water that is outside of the potato cells. As the concentration of water molecules is of a higher concentration in the distilled water than inside the potato, there are more water molecules going through the potato membrane into the cell than water molecules from the inside of the potato going through to the other side. This is because there are more water molecules in the distilled water. Therefore the net flow of water by osmosis is into the potato cells. As more water molecules pass into the potato cells, the va... ...Maybe next time I could roll each potato chip down the paper towel once and blot the ends of them two times on the paper towel. To prove that my prediction is correct in any osmosis experiment, I could do another experiment, which shows osmosis happening and why it happens-different concentrations between a selectively permeable membrane. The experiment is shown below: Apparatus * 20cm in length visking tubing. * 20cm3 water * 10cm3 plastic syringe * testing tube Method Tie a knot at the end of 20cm length visking tube that has been soaked in water. Put 3cm3 of strong sugar solution in the plastic syringe and use that to partly fill the visking tube-it should be floppy. Place the visking tubing into a test tube containing water 20cm3 . Leave the visking tubing in the test tube for about 30-45 minutes. You should record your observations of the visking tubing before it was put into the test tube of water and after it had been left in the water. Look for any changes in how it looks and feels. Is it turgid or flaccid? References Collins GCSE total revision Science by Mike Smith and Chris Sunley GCSE Biology second edition by D.G. Mackean

Lex Cost of Capital

Lex Service PLC— Cost of Capital In 1928 Lex Garages Limited, at the time of public incorporation, had single garage in London. After 60 years, Lex Service PLC became a leading company in automotive distribution and leasing in the United Kingdom. In late 1950, Lex obtained from Volvo Car Corporation the exclusive franchise to import and distribute Volvo cars in the United Kingdom that ended in1992 four years before the scheduled termination date. This news dropped the share price of Lexto 30%.In 1970s, Lex started to expand its business into other services like transportation andleasing and for temporarily in hotel management business. By the end of 1983, Lex was structured around two principal groups ¶ i-e Lex Automotive and Lex Electronics Worldwide. From 1991 to 1993, Lex sold its major electronic business to Arrow Electronics, Inc. With theseries of acquisitions by Lex, finally it entered in the profitable business by acquiring acontrolling interest in the U.K importersh ip, Hyundai Car (U. K) in September 1993. Thisacquisition gave Lex management control of a three year rolling contract that Hyundai Car heldwith Hyundai Motor Company of Korea. In this case study, board meeting was scheduled in 1993 to review its cost of capital proceduresand to determine whether Lex Service PLC should use different hurdle rates for differentdivisions or should use cost of capital for the whole company.Lex Service PLC was concerned about its cost of capital in 1993 because from 1991 to 1993 Lexhad gone through many acquisitions and sales of assets that changed its capital structure in ahuge way. That change of capital structure included the sale of whole electronic division toArrow Electronice, Inc and acquisition of Hyundai Car (U. K). Moreover, they had cash toreinvest so Lex wanted to properly estimate its Cost of equity. Once new cost of capital is computed that will enable the firm to estimate its required rate of return on its investments.Ingeneral companies m ake use of CoC through discounted cash flow or share pricing method. To calculate cost of capital (equity), risk free rate and value of risk premium, calculations are asfollows:If Lex had no debt in its capital structure then the relationship between its levered equity betaand asset beta can be like: ? (asset) = E/V * ? (equity) And it also implies that interest and principal payments on the debt are fairly safe that makes the beta of debt to zero. If there is no debt then cost of capital will become the cost of equity.Moreover if Lex adds moderate amount of debt in its capital structure that means equity will become more risky and cost of equity will increase and so will the cost of capital. In order to fully evaluate future investment opportunities, Lex should single discount rate if the project is enough to represent the whole firm e-g in acquiring the very similar company. But Lexshould use multiple discount rates in evaluating the projects that replicates one of its divisions e -g investment in the automotive division should use the cost of capital of automotive division andsame goes for other divisions

The Gorill Natural Selection And Sexual Selection

Darwin’s theory is in regards to natural selection and sexual selection. The gorilla is an animal that uses the two selections to determine their protection, feeding, and reproduction. First Charles Darwin described the characteristics and structures that a animal like a gorilla is born with. He states that these characters and structures will have slow changes that will be different than when they were born. Then he believes that they will have characters and structures that are trifling important. This means that although the structures and characters may look like they aren’t important, these structures and characters actually have a significant factor regarding their protection. The gorilla possess significant structures and characters that are prime for their survival. Thirdly, Darwin believes that in natural selection animals like gorillas have structures and characters that are beneficial between the young and the old. These structures and characters are what pro tects gorillas. They are also used to feed gorillas like the breast on a female gorilla, or the silver hair on the back of a male gorilla. Lastly, Darwin explains the greatness of sexual selection involving gorillas. He also believe that they use determining factors on what male gorilla the female gorilla chooses to reproduce with. After analyzing the quotes from Darwin’s â€Å"The Survival of the Fittest†, I will explain the quotes to some degree and use examples that the gorillas possess that are