Make the new dilution series. Remember to start with salt concentration where the egg first floated. (If you don't have enough solution from the original serial dilution, make some more by starting from the stock solution.) 8. As before, test the egg in each cup, starting with the lowest salt concentration.
Osmosis/Egg Lab By: Nicole Dressen Problem to Solve: How the mass of an egg changes in different substances. Information Collected: A. Hypotonic: a substance with lower concentration when compared to another substance. B. Isotonic: when the concentration of two substances is the same. C. Hypertonic: a substance with more concentration when compared to another substance. Hypothesis: I think the mass of the egg that is in the water will stay the same but the mass of the egg that is in the sugar will increase mass.
Investigation into the effect of variation in temperature on the permeability of cell membranes using fresh beetroot. Identification of trends and patterns As the temperature was raised, more pigment leaked out of the beetroot disks, which in turn meant that less light was able to be transmitted through the liquid. For example, at 80°c the percentage light transmission through the liquid was 0%. At 20°c the percentage light transmission through the liquid was 76%. This proving the above statement.
Liz Somone Chem 112 TA: Meng Floating Egg Lab Report The goal of this experiment was to determine the density of a solution needed to float an egg, the freshness of an egg, and the way volumetric glassware affects the value and accuracy of density. The types of volumetric glassware used were a 25-mL buret, 25-mL Mohr pipet, 25-mL volumetric pipet, 25-mL volumetric flask and a 25-mL Erlenmeyer flask. I prepared a 1500 mL solution of salt and water in order for the egg to float. Using that same solution I filled a buret that was mounted vertically to the 0 and then drained the solution to nearest 0.00 mL. The solution was then drained into an Erlenmeyer flask and I recorded the weight of the flask before (W1) and after the solution (W2) and then subtract the weight of the flask with the solution from the weight of the flask alone in order to find the absolute mass of the solution (W3).
When the average heart rate from the Control group, (151), is compared against the 3 average heart rates recorded from the three strengths of alcohol, (133, 109, 109), I interpreted that the heart rate is reduced at all alcohol strengths. My hypothesis for the Caffeine portion of the experiment was that at the introduction of caffeine to the water flea, as well as each stronger level of caffeine to its system, the water fleas heart rate would increase. When the average heart rate from the Control group, (176), is compared against the 3 average heart rates recorded from the three strengths of caffeine, (175, 173, 176), I interpreted that the heart rate is similar to both the control test, as well as with all alcohol strengths. I did not expect those results; I anticipated a higher heart rate. Were I to conduct this project again, I would find a more accurate way to measure the heartbeats, wait longer between applications of both alcohol and caffeine and wait longer after each application of alcohol or caffeine for it to take effect in the water fleas system.
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.
CHAPTER 5: MICROIAL METABOLISM PRE-TEST 1: Which of the following types of transport involves the expenditure of energy and special membrane proteins? ACTIVE TRANSPORT 2: Which of the following molecules serves as the short-term recyclable energy supply for a cell? ATP 3: Which of the following is a waxy lipid found predominantly in the cell walls of Mycobacterium? MYCOLIC ACID 4: Catabolic reactions are chemical reactions that BREAK LARGE MOLECULES APART 5: Denaturation is typically a problem with which of the following? PROTEINS 6: A difference in the concentration of a chemical on both sides of a membrane leads to which of the following phenomena?
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
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.
Amino acids, nucleosides, sugars, and other small molecules are often transported across membranes by uniporters. Uniporters carry only one type of solute, it binds to one molecule of substrate at a time and transports it with its concentration gradient. Examples of molecules that must use facilitated diffusion to move in and out of the cell membrane are glucose, sodium ions, and potassium ions. They pass using carrier proteins through the cell membrane without energy along the concentration gradient. Active transport, which is basically the movement of particles through a transport protein from low