(a) (i) ● the concentrated sucrose solution in X has a lower water potential than the water in flask A (1)-water from flask A moved into X by osmosis (1) ● generated a hydrostatic pressure that forced the contents in X (with the dye) to move into Y (1) via the tubing L (ii) ● tubing M channelled water from flask B to flask A (1) ● this resulted in a continual supply of water for mass flow (1) ● M = *Xylem (1) (iii) X‚ sucrose formed by the photosynthetic
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one result of this molecular movement. Diffusion is the random movement of molecules from an area of higher concentration to areas of lower concentration. Osmosis is a special kind of diffusion where water moves through a selectively permeable membrane (a membrane that only allows certain molecules to diffuse though). Diffusion or osmosis occurs until dynamic equilibrium has been reached. This is the point where the concentrations in both areas are equal and no net movement will occur from one
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TABLE OF CONTENT Task C1 C2 C4 C5 C6 C7 C8 E3 Title Osmosis in Living Tissue Catalytic Activity of Enzyme Action of Electricity on Substances Encountered in Daily Life Do All Conductors Obey Ohm’s Law? Composting Bioreactor Sunglasses’ Protection from Ultraviolet (UV) Radiation Extracting DNA from Fruits How Cross-linking Changes the Properties of a Polymer Integrated Science Sample SBA Task Practical Related Task – C1 Osmosis in Living Tissue Student Handout (Version 1) Purpose To determine
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control after 24 hours. Part B ( Effect of osmotic pressure on growth) 1) Label four plates of glucose agar containing varying concentrations of NaCl (0.5%‚ 5%‚ 15%‚ and 25%) and three plates of glucose agar containing varying concentrations of sucrose (0.5%‚ 15%‚ and 30%). 2) Escherichia coli‚ Pseudomonas fluorescens‚ Micrococcus luteus‚ and Saccharomyces cerevisiae were inoculated into each plate. 3) The petri plates were then incubated at 37°C 24 hours. RESULTS: Part A) Effect of
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Diffusion & Osmosis: Introduction: This experiment was performed to demonstrate the process of osmosis and to show visible as well as quantitative evidence proving that osmosis occurred. Through the tasks of determining the percent concentrations in two different solutions‚ we were studying the process of osmosis. Osmosis is the best way to perform this experiment because as we went through the experiment‚ the weight of the beaker/dialysis tubing changed and the only logical explanation was
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Big Idea 2 Biological systems utilize free energy and molecular building blocks to grow‚ to reproduce and to maintain dynamic homeostasis. Living systems require both free energy and matter to maintain order‚ grow and reproduce. Organisms employ various strategies to capture‚ use and store free energy and other vital resources. Energy deficiencies are not only detrimental to individual organisms; they also can cause disruptions at the population and ecosystem levels. Biological systems must both
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Honors Biology January 13 – 17‚ 2014 day do in class complete as homework 13 _ continue lab: Investigating Osmosis _ determine molarity of unknown solutions _ plot % change in mass by sucrose molarity _ use a best-fit line to determine the molarity of a russet potato _ write discussion of results · use CER · use vocabulary appropriately! _ due on January 15th _ pick up copy of graphic organizer: the Cell Cycle _ write NEWS assignment _ due tomorrow
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separated by a selectively permeable membrane from a solution of 0.2M fructose and 0.7M sucrose. The membrane is not permeable to the sugar molecules. Indicate which side is initially hypertonic and which is hypotonic. Show‚ using an arrow‚ the direction of osmosis. 4. Red blood cells are placed in three beakers
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(peptide bonds or tyrosine groups)‚ glucose‚ sucrose‚ starch or lipids. You should know the chemicals/reagents in each test and the results that would indicate a positive or negative for each biochemical. 7. Define and understand the concepts behind common processes including diffusion‚ osmosis‚ active transport‚ Brownian movement and plasmolysis. 8. Understand the methods by which materials move through plasma membranes including diffusion and osmosis. 9. Be ready to define concentration gradient
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Cell Membranes and Transport Hands-On Labs‚ Inc. Version 42-0033-00-01 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing
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