after being soaked in water Aim: The effect of salt concentrations on the mass of the pear ‘Pyrus’ pieces shaped as cubes of 1cm. Background: Osmosis is the net movement of water molecules through a semi-permeable membrane from an area of higher water potential to an area of lower water potential. Water makes up to 70-90% of living cells and cell membranes are partially permeable membranes. Dissolved substances attract a ‘cloud’ of polar water molecules around them. The cloud is held by weak
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plant physiologist‚ Wilhelm Pfeffer. Ten years prior‚ Moritz Traube prepared the first recorded synthetic membrane that was made from a precipitated film of copper ferrocyanide. It was not until almost two hundred years later that the process of osmosis was revisited and extensively reviewed by researchers from the University of California at Los Angeles. In 1959‚ Sidney Loeb and Srinivasa Sourirajan developed a membrane made from cellulose acetate‚ which removed at least ninety percent of salts
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Introduction: In this experiment‚ you will study osmosis. Your task is to design an experiment that will determine what concentration of solute is isotonic with the specimen cells. (Design) Procedure: You will be provided with the following materials: Potato‚ potato corer‚ scalpel‚ forceps‚ electronic balance 10 % salt solution‚ distilled water‚ 50 mL beakers‚ graduated cylinder‚ paper towel You must design a procedure that will enable you to determine the concentration
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SBI4U Exam Review Topic 1 1. The table below shows the level of hemoglobin measured in two different groups of athletes. Hemoglobin / grams per 100 cm3 Number of athletes tested Standard deviation / grams per 100 cm3 Group A 12.6 200 0.8 Group B 11.9 220 3.2 Which of the following statements is correct? A. Results from group B are more accurate because more athletes were tested. B. Results from group B are more reliable because it has a higher standard deviation. C.
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Science Lab Report INTRODUCTION |NAME: LORRAINE |LAB PARTNER: KAREN HO | |LAB EXPERIMENT: TESTING OSMOSIS WITH A POTATO |LAB DATE: NOV. 23rd / 2012 | |CLASS: Y-11-C |PERIOD:C | OBJECTIVE The weight of the potato slices will increase‚ decrease‚ or remain
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physical‚ behavioral or other attributes survived over those who didn’t (Natural Selection) What evidence is there to support the theory of evolution through natural selection? - Fossil- are preserved remains‚ tracks‚ or traces of once-living organisms o Most direct evidence of macroevolution o By dating the rock we can get an accurate idea of how old the fossil is (history of evolutionary change) - Anatomical- reveals similarities between structures of species
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Rice|38| Baker’s Yeast|42| Candida Yeast|48| Neurospora|50| Reflection Questions: Summarize your amino acid comparison in paragraph form. To guide your summary‚ reflect on the following questions. What does it mean when scientists say that living organisms share a universal genetic code? It means that all extinct organisms have all the same genetic code. How does a universal genetic code relate to the hypotheses about the origin of life on Earth? the near-universal genetic code is that
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KULIT – Living with Psoriasis PDM Campaign 2007 (Article 6 – ‘T’ – Treatment) Yes‚ psoriasis can be treated This six-part KULIT article series by the Persatuan Dermatologi Malaysia aims to raise awareness of psoriasis. In this final article‚ PDM President Dr Allan K C Yee highlights an important message for people with psoriasis – there is no cure yet for psoriasis‚ but its symptoms can be effectively treated and managed. Be open-minded and willing to work with your doctor to find a treatment
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2. Draw and completely label a cell membrane. [pic] 4. List and briefly discuss the 5 components of cellular membranes. 1. Phospholipids layer- 2 layers ‚ polar and non polar ‚ polar facing the extracellular fluid and cytoplasm 2. Transmembrane proteins-integral membrane proteins are proteins that expand the membrane 3. Interior protein network-peripheral proteins are in the interior side of the membrane 4. Cell surface markers are glycolipids‚ carbohydrates/lipid
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amount of sucrose concentrations. The higher molarity concentrations increased the movement of water to balance out the inside of the tube and the beaker. The greater amount of concentration gradient‚ in each tube‚ increased the rate of osmosis. This rate of osmosis is due to the net movement of water from an area of low concentration to an area of high concentration. Because the tubes had different concentrations‚ certain tubes gained more mass than others. Solution A had 0.6 molarity which increased
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