DETERMINATION OF THE WATER POTENTIAL OF POTATO TUBER CELLS. Method. Five sucrose solutions with varying molarity and one control containing distilled water were prepared and poured into test tubes. The potato discs were dried‚ weighed and added to the test tubes. The discs were then weighed again after a period of 24 hours. The percentage change in mass was then calculated. Apparatus.  Specimen tubes with stoppers x6  1cm3 diameter cork borer  razor
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Each of these calculations was then also recorded in my lab manual. I made sure I noted the time the experiment started‚ ended‚ and the total elapsed time in hours in my lab manual as well. 7.2 Experiment: Osmosis I worked in a group of 4 to complete this experiment. First off I took the four sections of 15-cm long dialysis tubing that had been presoaked in dH2O and folded over one end of each tube (I found that twisting works well too) and tightly tied one of the 8 10-cm pieces of string (or
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This indicates that solution X is isotonic because the concentrations are similar‚ resulting in no difference in appearance. Solution Y is hypertonic because it shrank the membrane in plasmolysis‚ which forced all of the chloroplasts to the center of the cell. The cell possessed a higher concentration of water than the solution‚ which expelled all of the water in the cell‚ causing it to shrink. Solution Z is hypotonic because of the visible
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there will be no net movement. (Water crosses the cell membrane but the amount going in is the same as the amount coming out‚ so there is no net movement‚ When the cell is in this state between turgidity and flaccidity‚ It’s called Incipient Plasmolysis. Osmosis is a form of passive transport‚ passive transport doesn’t use energy‚ the molecules go down a concentration gradient. Active transport is the opposite it uses ATPase for energy‚ and molecules move against a concentration gradient.
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concentrations. In this lab‚ we will determine the effects of hypertonic‚ isotonic and hypotonic solutions on plant and animal cells. In general when an animals cell’s placed in hypertonic solution it shrivels; a plant cell on the other hand undergoes plasmolysis. When an animal cell’s placed in hypotonic solution‚ it begins to swell and then finally lyse; a plant cell placed in this type of solution however‚ is said to be turgid. In isotonic solution‚ the animal cell stays the same (normal) whereas the
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Osmosis Lab: Potatoes and Elodea Background Information: Cells have a need to regulate their internal environment. They need to be able to this because cells often find themselves in environments where the concentration of dissolved solids outside the cell is different from the number of dissolved solids inside the cell. Since the solids can not move across the membrane‚ the cell responds by moving water either into or out of the cell in an attempt to balance the number dissolved particles.
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Cells must move materials through membranes and throughout cytoplasm in order to maintain homoeostasis. The movement is regulated because cellular membranes‚ including the plasma and organelle membranes‚ are selectively permeable[1]. The purpose of an automatic flow of molecules is to create equilibrium on each side of the membrane. In order for molecules to pass through the membranes‚ there must be pores. The size of the pore determines what molecules can cross. Due to the size and polarity‚ only
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Osmosis/Plasmolysis Lab Name: Problem: How do solutions of various salt concentrations influence osmosis in relation to an onion cell? Materials: (per student group): red onion epidermis forceps‚ dropper distilled water NaCl solution paper towels microscope slide cover slip Procedure 1. Make a wet mount of the red onion epidermis. 2. Examine under low power. When you have a clear view of several cells‚ switch to high power. Make a labeled drawing
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water molecules across the cell membrane from hypertonic to hypotonic solution. (iii) The stage where chromosomes lie on the equator of the achromatic spindle. (iv) Alternative form of a gene on a pair of homologous chromosome. (v) Period of complete intrauterine development of the foetus. [5] (d) Given below are five sets with four terms each. In each set one term is odd. Choose the odd one out of the following terms given and name the category to which the others belong: [5] SET ODD TERM
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Name: Lawrence D. Mandras Date: August 17‚ 2013 Rating:_____ Yr. & Course: BSED-IV Laboratory Experiment no. 2 The Living Plant Cell Objectives: * To study the different types of plant cells. * To observe plant cells as to their shapes‚ structures and function. Materials: Microscope cover slip glass slide water onion Iodine soln. hydrilla salt tomato razor blade Medicinal dropper epidermal tissue of rhoeo-discolor
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