Passive transport does not require the use of added energy to facilitate the transfer where as active transport requires the cell to expend energy. Diffusion is the simplest form of passive transport. Using its own energy molecule will move from areas of higher solute concentrations to areas of lower concentrations until a balance is reached. Osmosis is also a form of passive transport. Osmosis occurs when water molecules diffuse across the cell membrane from an area of higher solute concentration to an area of lower solute concentration.
1.2- Important factors affecting osmosis and diffusion would be how concentrated the solution or solute is, the temperature that the environment or the solution is. What your using and also how large the particle is. 1.3- Aim: The aim of the experiment is to document a rhubarb cell under a microscope, using different concentrations of salt-water solution to determine how much the cell decreases in size, volume and shape and to record the difference in cell reduction. (2) 1.4- Hypothesis: This experiment we expect that the rhubarb cells will drastically shrink with the higher concentrations of salt-water solutions. 1.5- Before starting this experiment we didn’t know how drastically the rhubarb cell would shrink, or if this experiment would actually be a success.
DATE: 9th AUGUST 2011 TITLE: INVESTIGATION OSMOSIS IN QUAILS’ (Coturnix japonica) EGG Research Question How does different concentration of sodium chloride solution which is 0%, 5%, 10%, 15% and 20%, affect the mass of de-shelled quail’s eggs after they are immersed in sodium chloride solution for 1 day(24 hours)? Variables Table 1: Independent and Dependent Variables Variables | Units | Range | Independent variable | Concentration of sodium chloride solution | mililitre(ml) | Concentration of 0%, 5%, 10%, 15% and 20%. | Dependent variable | Change in the mass of quail’s egg | gram(g) | Difference between initial and final mass of quail’s egg | Table 2: Controlled Variables and Its Possible Effects On The Experiment. Controlled variables | Units | Possible effects | Time taken of the quail’s eggs are being immersed | Hours | The long time taken of the quail’s egg are being immersed in the sodium chloride solution which is 24 hours is kept constant.This causes the change of mass of the quail’s egg resultant from the osmosis process. | Volume of sodium chloride solution used | Millilitre(ml) | The volume of sodium chloride solution is kept constant so that the water molecules in each solution are the same.
(2? marks) Specific primary structure/amino acid sequence; Specific tertiary structure; Determines binding sites; Complementary to specific antigens; 5) (Cyanide) a) Describe what the graph shows. Slows it down up to (a certain point); then, sodium uptake is halted completely; (2 marks) b) 0.2. The y-axis said concentration remaining, so you had to do 10 - 4 which is 6. Then divide that by 30 to get 0.2 c) Cyanide affects respiration.
Also we have been testing the effects of diffusion through a membrane. 2. Why did the egg shell disappear? The egg shell is made up of 94% calcium carbonate, 4% organic matter, 1% magnesium carbonate and 1% calcium phosphate. On the other hand cider vinegar which I used for this experiment is made up of 5% acid and 95% water.
One cation is to be eliminated. If a precipitate was formed earlier, then 10 more drops of NaOH was added to the tubes. With these test, another cation is eliminated. The second elimination test which was the ammonia test which was performed with the three cation left. 10 drops of each cation that are left are added to clean centrifuge tubes.
2011). The movement of materials across the bilayer can be achieved through passive and active transport; Passive transport is where small molecules can pass freely across the membrane without the need for an energy source, such as water and oxygen
Passive transport processes: Diffusion Diffusion is the movement of ions or molecules from regions of high to low concentration; down a concentration gradient. Diffusion and the plasma membrane The plasma membrane is semipermeable which means it will allow certain substances to go in and out but not others. Moecules that pass through the phospholipid bilayer easily: Hydrophobic molecules: 02 and N2 Non-polar: Benzene Small uncharged polar molecules: H20, Urea, glycerol and CO2 Molecules that don’t pass through the phospholipid bilayer easily: Large uncharged molecules: Glucose Polar molecules: Sucrose Ions (charged): H+, Na+, HCO3, K+Ca2+, Cl- and Mg2+ Therefore the three characteristics of a molecule that determine their permeability through the membrane are: 1. Polarity- Hydrophobic vs Hydrophilic 2. Charge- Charged vs Uncharged 3.
Maxine Alexandra G. Merin February 4, 2014 BSMT-2C Principles Solubility Test: The test is based on the property of solubility of lipids in organic solvents and insolubility in water. The oil will float on water because of lesser specific gravity Reaction to Iodine to test for unsaturation of fatty acids: The unsaturated fatty acids absorb iodine at the double bonds until all the double bonds are saturated with iodine. Hence the amount of iodine required to impart its color to the solution is a measure of the degree of the fatty acids. Chloroform dissolve sample give red color which decolorizes the iodine giving brown color. This indicates the presence of fatty acids.
Similarly when the Calcium Carbonate (CaCO3) is broken down into powder the rate of reaction will increase. Because smaller pieces of the same mass of solid have a greater surface area compared to larger pieces of the solid. With this in mind when the Calcium Carbonate (CaCO3) is in solid form, the reaction rate will decrease. Procedure 1. Wear safety goggles 2.