Introduction In this Lab the students dealt with Osmosis‚ movement of water molecule or solvent from a high concentration to a low concentration‚ through selective permeability‚ a protective barrier that provide some particle the ’direct ’ passage in and out of the plasma membrane ( Lacerda L.2011) Allowing some molecules enter and exit the cell membrane‚ to create a balance in concentration inside and outside of the cell‚ by doing so the cell often become hypotonic‚ where the concentration
Premium Cell membrane Diffusion Molecular diffusion
Using Sucrose Solutions to Determine Osmolarity of Potato Tubers Based on Weight By Thomas Pelikan Biology 200A Section 004 Kimberly Schmidt October 2‚ 2012 Abstract: In this experiment we were trying to determine the osmolarity of potato tubers by weighing them before and after incubating them in solutions of sucrose with varying molarities. To find the osmolarity we took a potato and used a cork borer to obtain seven samples of potato tubers. We then prepared seven beakers with concentrations
Premium Concentration Osmosis Solution
Introduction The purpose of this lab is to find out which osmotic environment the eggs are in while sitting in different liquids. There are three different types of environments: hypotonic‚ isotonic‚ and hypertonic. Hypotonic solution causes the cell to swell until it bursts. Hypertonic solution causes the cell to shrink or to lose weight. Isotonic solution doesn’t cause the egg to shrink or swell‚ it keeps the cell the same it’s just in a different environment. The hypothesis for the egg in
Premium Chemistry Osmosis
perhaps the single most important molecule in any living system (Hayden and McNeil 2012). Since water molecules are so small‚ they are constantly going into and out of the cell. Osmosis is a situation where more water molecules are moving across the membrane in one direction than the other (Hayden and McNeil 2012). During osmosis the net movement of water molecules will be from a solution that has a lower osmotic concentration to a solution that has a higher osmotic concentration. When a solution has
Premium Concentration Osmosis Chemistry
down sucrose is too large of a molecule to diffuse through semi permeable membrane and wouldn’t be able move in and out of cells affectively. Because potatoes have sucrose inside them a concentration gradient is present and if placed in any solution osmosis movement of water through semi permeable membranes would naturally occur. If the concentration of sucrose in the solutions is less than the concentration in the potato then the potato will gain mass and vice versa. In conducting this experiment sucrose
Premium Glucose Solution Concentration
Reverse discrimination Affirmative action is not the source of discrimination‚ but the vehicle for removing the effects of discrimination. The Labor Department report found less than 100 reverse discrimination cases among more than 3‚000 discrimination opinions by the U.S. District Court and the Court of Appeal between 1990 and 1994. Discrimination was established in only six cases. The report found that‚ "Many of the cases were the result of a disappointed applicant . erroneously assuming that
Premium Affirmative action Discrimination Racism
Education 28: 83 – 85. Bland‚ W. and C. B. Tanner (1985) Measurement of the water potential of stored potato tubers. Plant Physiology 79: 891-895. Boyer‚ JS (1969) Measurement of the water status of plants. ARPP 20:351-364. Koning‚ R (1999) Web Site: Osmosis Lab. Kramer‚ P (1983) Water Relations of Plants. Academic Press‚ NY. Meidner‚ H (1984) Class Experiments in Plant Physiology. George Albert Unwin‚ Boston. Reiss‚ Carol (1994) Experiments in Plant Physiology. Prentice-Hall‚ Englewood Cliffs‚ NJ. Ross
Premium Cell wall Tuber Osmosis
PLASMA MEMBRANE SELECTIVE PERMEABILITY= allowing some substance to cross it more easily than others composed of: Phospholipids Proteins Carbohydrates Cholesterol FLUID MOSAIC MODEL Phospholipids are primary lipids(constantly moving‚ fluidly) AMPHIPATHIC-containing hydrophobic and hydrophilic regions Mosaic part=not made of one thing Freeze-fracture studies:way to view what’s inside FLUIDITY OF MEMBRANE Move within bilayer Most of lipids and some proteins‚ drift laterally
Premium Membrane biology Cell membrane Lipid bilayer
DIFFUSION= The movement of atoms or molecules from an area of higher concentration to an area of lower concentration. Atoms and small molecules can move across a cell membrane by diffusion. OSMOSIS= Diffusion of fluid through a semipermeable membrane from a solution with a low solute concentration to a solution with a higher solute concentration until there is an equal concentration of fluid on both sides of the membrane. SELECTIVE PERMEABLE MEMBRANE=a membrane (as a cell membrane) that allows
Premium Cell Osmosis Chromosome
of a substance against its concentration gradient (from low to high concentration). Al2O3 (aluminum oxide) O ------ Al ----- O ------- Al --------- O Alleles: A version of a gene. Alternating current (AC). is electric current that repeatedly reverses its direction; the electric charges vibrate about relatively fixed positions. In the United States‚ the vibrational rate is 60 Hz Amino Acid (Organic or Inorganic?) Organic Amoeba: Eukaryota Amperes: is
Premium Water Osmosis Life