The movement of water leads to dramatic changes in the volumes of the two compartments. Osmosis in red blood cells affects the tonicity of the cells. Tonicity refers to the ability of a solution to change the shape or tone of cells by altering the cells’ internal water volume (Marieb 2013). Changes in the concentration of water on either side of the cell membrane result in a net loss or gain of water by the cell (Marieb 2013). If cells are exposed to a solution that has the same solute/water concentration as inside the cells, the solution is said to be isotonic.
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. This occurs because this scenario will be initially closest to an isotonic solution, allowing us to determine the solute concentration of a potato. Materials: * Knife/ Cork Borer * Seven 30 cm pieces of Dialysis tubing * Thirteen 250 mL Beakers * 15% Glucose Solution * Glucose Test Strips * 1% Starch Solution * Distilled water * Lugol’s solution * 25 mL of: * .2 M sucrose * .4 M sucrose * .6 M sucrose * .8 M sucrose * 1 M sucrose * Paper Towels * Clock * Potatoes * Plastic
The Effects of NaCl and DI water on Potato Cells Abstract: The experiment we conducted gave the result that when a potato has contact with a salt solution, the cells will start to shrink. We did this by cutting up slices of potato and weighed them and recorded their initial weights. We used deionized water and three different concentrations of sodium chloride solutions; 10% NaCl, 15% NaCl, and 20% NaCl. We than placed each potato slice in test tubes with their designated solutions. We let them soak for 20 minutes than we removed them from the test tubes.
Solutes meaning: the substance that is being dissolved, while solvents meaning: substance being dissolved into, much like diffusion. Diffusion can be defined as particles that move from a higher concentration to areas of lower concentration. Diffusion is one of the key processes involved in the movement of materials into and out of cells throughout living systems. Osmosis is the diffusion of the water through a selectively permeable membrane from an area where it is more concentrated to an area where it is less concentrated. Different solutions can be categorized as hypotonic, hypertonic and isotonic as different concentrations.
Review the effect of pH on enzyme function. Students should understand that enzymes function best at specific pH levels (which vary depending on the enzyme). Non-optimal pH levels can affect the shape of the enzyme, thereby decreasing its effectiveness as a catalyst. Extreme pH levels can permanently denature the enzyme protein, whereas less extreme pH conditions may only temporarily alter . Lactase is effective at pH 2 – 7 (including dH2O) and therefore breaks down the lactose sugar in milk into glucose and galactose.
Lab Report for Experiment #9 Caloric Content of Foods Purpose: (copy from lab; 1 point) • To measure the energy content of various food items, and • To become familiar with energy units like calories and joules Describe any changes to the procedure here in detail here: For example: I weighed the marshmallow directly without the holder. Or I used the following food instead: The food items that I used for this experiment were mini marshmallow, a peanut, and small potato chip. Observations: Keep notes on any observations you make while working on this experiment, copy them into the space below. Be detailed. The mini marshmallow burned very quickly, but did not burn all the way.
A) is neutralized by water B) is surrounded by water molecules C) reacts and forms a covalent bond to water D) aggregates with other molecules or ions to form a micelle in water Answer: B Page Ref: Section 3 11 9) Which would you expect to be most soluble in water? A) I B) II C) III D) IV Answer: A Page Ref: Section 3 10) Solutes diffuse more slowly in cytoplasm than in water because of A) the higher viscosity of water. B) the higher heat of vaporization of water. C) the presence of many crowded molecules in the cytoplasm. D) the absence of charged molecules inside cells.
If you drink too much water, your cells can expand and eventually burst, which can be dangerous. Two ways to deal with dehydration Move the dehydrated person to a cool area so he/she can cool down, put a cool cloth on his/her forehead. - Sip water slowly. If you drink too much water, your cells can expand and eventually burst, which can be dangerous. Five ways water is used in the body - Your cells need water to live and survive.
. Design a) Defining the problem and selecting Variable I) Aim/Research Question: To investigate the effect of solute concentration on the length of potato strips when submerged in a range of concentrations of sugar solution. II) Hypothesis: If the concentration of the sugar solution increases, then the osmotic gain of the potato strip will decrease. III) Scientific Explanation: Osmosis is a type of passive transport where passive movement of water molecules occurs along a concentration gradient, across a partially permeable membrane. (Damon, )Since the movements of substances in passive transport take place from an area of high concentration to an area of lower concentration until both areas reach equilibrium, the water molecules will move from the potato strips to the sugar solution when there is less water concentration in the solution.
Research Question: How will the different potato wedges submerged in various salt solutions affect on the weight and length of the potato wedges? What is the DV and how exactly will you measure it and how many trials will you do: %∆ Change weight and length of the potato chips after they have been placed in different salt concentrations after 24 hours What factors could affect the DV: What? | How? | Why? | Temperature | Keeping the temperature the same by placing the petri dishes in the refrigerator.