This will occur because the water and glucose are small enough to diffuse out of the pores in the dialysis bag, but the starch molecules are too large to fit through 2. If a solution is very hypertonic, then the most amount of water will diffuse across the semi-permeable membrane into the dialysis tubing. This occurs because the higher concentration of solute, the more water it takes to reach equilibrium, thus, the faster rate of osmosis. 3. If we place the potato in a sucrose solution with a similar solute concentration as a potato, then the least amount of water will diffuse into or out of the potato cells.
Effect of Surface Area to Volume Ratio on Diffusion Rate of Glucose from Potatoes Abstract: The experiment was conducted to determine if differences in surface area had a significant effect on diffusion rate of glucose from potatoes. Potato samples of three different lengths were collected through a process of coring along the middle of the vegetable. Cores were soaked in distilled water for a period before an o-dianisidine-enzyme solution was added. Glucose diffusion rates were determined by using a spectrometer after a period of incubation of the potato samples. Glucose levels were measured at 0.52, 0.57, and 0.67 showing that an increase in surface area corresponded with a non-significant (p=0.096) increase in the glucose diffusion rate.
This reaction can be delayed or prevented in fruits and vegetables by the addition of acids, such as lemon juice, and by cooking (Hemelstine, 2004). In this experiment, the effect of pH on the rate of reaction of the enzyme catecholase will be examined. Since it has been found previously that acid can inhibit this enzyme (Hemelstine, 2004), this study will examine the effects of alkaline pH on enzyme activity. The prediction of this study is that as pH increases (becomes more basic), catecholase reaction rate will decrease. Materials and Methods Catecholase activity was determined as described by Ainsworth et.
Enzymes are practically or completely denatured if the ph is changed from the optimum Ph. We first learned how to work the spectrophotometer, bye first zeroing it out with our blank. Our blank contained potato
No matter the variety, original, crinkle, or baked, they are all manufactured with oil. This test will show how much oil each of these types of chips hold. I will be preforming a test with three varieties of 7-11 Select brand chips; Original Potato Chips, BIG BITE Hot Dog Potato Chips, and Kettle Style Salt and Vinegar Potato Chips. I will weigh out 0.5oz of potato chips, crush them on graph paper, and let them set for 1 minute. I will then remove the chips, observe the oil residue left behind, and record the data.
Which pathogen do you think is responsible for this foodborne illness? Listeria monocytogenes 2. What is the Riboprint ID for the individuals with the foodborne illness? A method of genetic fingerprinting. It refers to differentiating bacteria beyond the species or subspecies lv.
How do proteins associate with cell membrane? They associate as either peripheral or integral proteins. Associating as peripheral or integral depends on whether they are hydrophobic and can attach into the bilayer or hydrophilic and must stay on the outside of the bilayer via ionic interactions or H bonds. Integral proteins usually must be removed with detergents. How does the presence of cholesterol affect lipid
Use the 15 cm long ruler to help you if you are trouble. 7. Now cut the 6 cm long potato chips in half, use the 15 cm ruler to help you to make the potato chips 3 cm long. (Exactly half) 8. The next step is to take the potato chips and weight the mass of the potato chips, use a balance for this.
Biology coursework: An investigation to consider the concentration of a potato sap cell given variation of a concentrated solution. Aim: My investigation is based on the principle of Osmosis: to find and compare water potentials by measuring the gain or loss of mass of the potato. My aim for this investigation is to find the water potential of a potato sap cell and measure the gain or loss of mass (through the process of osmosis in the cells) when leaving consistent samples of potato to ensure precise and accurate results in solutions of varying concentrations of sodium chloride. Secondly I aim to find out if it is possible to work out the potential concentration of the cell sap. You can conduct this investigation using a sodium chloride or glucose solution.
As it begins to dissolve, the particles begin to move apart. Stirring a sugar cube will help it dissolve more quickly because you are helping the particles to spread apart at a faster rate. What Affects the Rate at Which Sugar Dissolves? The size and the surface area of the sugar particles also affect the rate of dissolution. When the particles are smaller, the total surface area of the sugar is larger and so the rate of dissolution is higher.