... about a scientist called Victor Frankenstein who has a deep obsession with bringing dead people back to life, which reflects on the her loss in her earliest years . After all Victor's research and heavy obsessing he eventually sparks off ...

... if there is a smaller surface area less water will enter. I also need to keep the potato same, so I need to use the same bura. Safety What I am going to keep safety will be that I'll make sure that ...

... that I will able to see how enzymes can be affected by temperature, as when I start adding the drops, the colour will change from black to a lighter colour. However, this only will occur at different speed and heat ...

... substances. To summarise osmosis: The diffusion of water molecules, down a water potential gradiant across a partially permeable membrane. Cells and osmosis A cell is surrounded by a partially permeable membrane, and water may cross the membrane easily. If cell is placed in ...

... test I will only change one factor and keep all the other factors constant as it could effect my results. An example of an unfair test where more than one factor is changed is shown below. Prediction I predict that the enzymes ...

... slowly and many large molecules, such as salt, do not move at all. There are many variables that I could change in my investigation to see what factors effect the rate of osmosis: * Type of membrane * Concentration of salt solution * ...

... the same length using a razor blade, making them even. I then set up the equipment as shown below and injected the hydrogen peroxide solution, and timed how long it took for 1ml of gas to be displaced as the ...

... less energy to collide; enzymes and substrates don't find each other and lock. Each enzyme works most effectively at a certain temperature called the optimum temperature. Which is around 50?C, but over this temperature the enzyme rapidly decreases in rate ...

... a razor blade, making them even. We then weighed each one individually, recording their weights in the table below (table 1). Leaving the potatoes alone, we then got 6 test tubes and put 25 ml of a different strength sugar ...

... a fair test I will: * Monitor the room temperature * Use the same volume of H2O2 & same pH * Same batch/age/brand and freshness of potato * Same diameter of potato * Same ruler * Same person measuring each time, from the same level RATE OF ...

... experiment showed osmosis, where water moves from a dilute solution to a more concentrate solution. To decide what to measurements to use for the main investigation I did some additional experiments. To decide what % sugar solution I should use. I made ...

... the potatoes when placed in salt solutions placed in different moralities. -I will be measuring the length change of the potatoes. I will record the length changes using a ruler. -Fixed Variables. The things that I have chosen to keep the ...

... a simple expression. On the right side there is pure water, which has the maximum water potential of 0. Water potential is the pressure created by water. As you can see from the diagram the pure water is pushing its ...

... be turgid. This means that the inward force is equal to that of the outward force. The inward pressure is called turgor pressure and the outward force is called osmotic pressure. The opposite of being turgid is being flaccid. This occurs ...

... I have the strips of potato, I will dry them with paper towel and then weigh them on scales to see what weight they are to start of with then record the data down in a table. I will then ...

... release of the end product, more substrate molecules can bind with the active site. Therefore, an enzyme is a sort of biological enzyme catalyst. Enzymes are classified into several catagories, such as hydrolytic oxidising and reducing depending on the type of ...

... respiration and photosynthesis. So somehow they need to take it up from the environment surrounding them. They do this using the small hair-like fibres on the roots. These hairs sense water and then the water is drawn up through the ...

... In simpler words and relating it to the experiment. The higher concentrations of salt in the test tubes will draw the water that already exists within the potato out so that they are now equal concentrations. Apparatus * Four test ...

... catalase, I am going to measure the amount of oxygen produced. I am going to use potato cylinders to explore this because catalase occurs in potato cells. In the experiment there are several variables that could affect what ...

... an area of low concentration through a semi-permeable membrane and this experiment will help us because potatoes are living things so they will use osmosis. And leaving them in a sugar solution of different concentrations will show us two things ...

... there are in the potato itself. These dissolved particles may be, for convenient use of household materials either salt (sodium chloride) or sugar. The idea is to dissolve the correct amounts of either sugar or salt particles into the water ...

... molecule actually comes into contact. This region is called the ACTIVE SITE. The active site of an enzyme is the region that binds the substrate and contributes the amino acid residues that directly participate in the making and breaking of ...

... is similar to diffusion, this is the movement of a liquid or gas from an area of high concentration to an area of lower concentration, however, osmosis is individual because it's the diffusion of water only across a semi-permeable membrane ...

... set this up so in my final experiment I could se that all these concentrations made an effect and would give me a clear difference in results. I also decided on an amount of solution for my experiment. I decided ...

... it will convert the hydrogen peroxide and oxygen gas will be evolved. The evolution of gas causes bubbles to form and is indicative of a positive test. Part I. Materials: Equipments: • MnO2 (inorganic catalyst) • 8 test tubes • H2O2 • thermometer • potato • beaker • liver • ...