Students need to put the eggs, after their shells have been removed, in the corresponding jars and leave them for two days. When they return, they must observe and measure the eggs. They suppose to see that the egg in vinegar should be hypotonic, the egg in syrup should be hypertonic, and the egg in distilled water is isotonic. Both jars with vinegar and syrup are independent variables, and the jar with distilled water is the
Look in the water bath on your table for a flask labeled DMA. This flask contains Davis Minimal Agar that has been autoclaved to make it sterile, and is being kept at 47 C to keep it liquefied. 3. Think about these important points in pouring a petri plate before doing it: a) You must work quickly, because once the container of minimal agar is removed from the bath, it will start to harden within 2-3 minutes. b) When pouring agar into the petri dish, pour just enough to fill the dish about half way.
Cover the blender with a lid and blend for 1 minute. Carefully without burning yourself, put the pot of rice back onto the stove. Add in the blend tomatoes and onion. Stir in and add 2 cups of water. Let the rice cook uncovered.
Apparatus: Weighing balance, beaker 100ml, paper towel/ filter paper, aluminium foil, marking pen, labeling pen, measuring cylinder 100ml and stopwatch Variables: Variables | Method to handle | Independent: The concentration of the sodium chloride solution. | Used different concentration of sodium chloride such as 0%, 5%, 10%, 15%, 20%. | Dependent: The difference in mass of the quail’s egg | Weigh the mass of the quail’s egg using a weigh balance before putting it into the sodium chloride solution and after 24 hours being in the solution. | Controlled: * Type of egg * The type of solution that cover the egg. * Use the same volume of sodium chloride solution.
Now that everything is set up, one is ready to begin the process of making oreo balls. First, one’s hands should be washed thoroughly. Then take the whole package of oreo cookies and place them in a food processor. Mix the oreo cookies until they are just crumbs. Add the softened cream cheese to the food processor and make sure that the oreo cookies and cream cheese are mixed well together.
Introduction All cells have plasma membranes which are selectively permeable meaning only some materials are able to move across it either to enter or exit the cell. The ability of a molecule to cross the plasma membrane depends on its size, hydrophobicity and charge as well as the relative concentration inside and outside of that cell (Biology Department, 2010). When molecules move from high concentration to low concentration it is called diffusion. More specifically when water diffuses across a cell membrane it is called osmosis. If the concentration of water in a cell is lower than the concentration of water in the solute the solution is said to be hypotonic and the cells swell because they will take up water.
3. Before putting each cube into a 400 mL Beaker of water guess if it will float or sink. Then test this hypothesis by putting the density cube in the water. Record your results. Remember to dry off the cubes once you get them out.
Observe after at least 5 minutes. For a closer examination, use the glass rod, popsicle stick or toothpick to hook the precipitate. * Step 6 – Pour the liquids down the sink and clean the rest of the equipment. Read more at Suite101: How to Extract DNA From Fruit and Vegetables: A Home Experiment for Viewing Real Deoxyribonkucleic Acid http://www.suite101.com/content/how-to-extract-dna-from-fruit-and-vegetables-a76806#ixzz1EkVq2LaJ Theory The mashing breaks the cells apart. The detergent breaks them open, freeing the cell contents (including the DNA).
Diffusion and Osmosis Shown In Solutions Section 1: Abstract This lab, title Diffusion and Osmosis, was centered around the diffusion across a cellular membrane and how exactly materials move and diffuse in concentrations. Both diffusion and osmosis are forms of movement that are part of passive transport dealing with cell membranes. Diffusion is where the solutes move from an area of high concentration to a low concentration. Water goes through the cell membranes by diffusion. Osmosis is specifically the movement of water through membranes.
Aim : To investigate the average different in mass of five quail’s eggs in five different concentration of sodium chloride solution. Research question : How do the five different concentration of sodium chloride solution affect the average different in mass of five quail’s eggs ? Introduction : In this experiment, we are investigating the effect of osmosis when quail’s egg are immersed in different concentration of sodium chloride solution. “When a cell membrane is said to be selectively permeable, it means that the cell membrane controls what substances pass in and out through the membrane. This characteristic of cell membranes plays a great role in passive transport.