Lab Report #1 Introduction A cell’s plasma membrane is known to be selectively permeable. This implies that the membrane is selective on what substances can pass in and out of the cell. There are two methods of transport that occur through the plasma membrane. One method of transport is called active process which uses ATP energy to transport substances through the membrane. The other method is called passive process which does not require the use of ATP energy. During passive processes
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Bella Nelson 11/25/12 Regents Biology 3BCD Osmosis and Plasmolysis Problem: What is the effect of Osmosis on a chicken egg? What is the effect of different solutions with various concentrations on plant cells? Hypothesis: 1. In an animal cell in a hypertonic solution the egg will swell‚ in a hypotonic solution the egg will swell. 2. In a plant cell in a hypertonic solution it will shrink‚ and in a hypotonic solution
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Analysis During the experiment‚ a dialysis bag was used to mimic a cell membrane. Two ways why this model realistically represents a cell is because the dialysis bag is semi-permeable‚ like a cell. The bag was able to allow water in‚ as the size of the water molecule was small enough to be able to fit through the pores of the bag. Sucrose was not able to pass through as the molecules were too big to enter. This is similar to a cell because the size of a molecule can determine whether or not the
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Results The objectives of this experiment were to investigate diffusion of molecules across a membrane and the factors that affect the rate of diffusion. The hemolysis time of sheep erythrocytes was measured for each of eight different nonelectrolyte solutions by eleven groups in BI 108 Section D2. These eight nonelectrolytes were urea‚ thiourea‚ methanol‚ ethanol‚ propanol‚ ethylene glycol‚ diethylene glycol‚ and triethylene glycol‚ and the mean hemolysis times can be seen below in Figure 1. The
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Osmosis of Sucrose Solutions of Different Molarities Through Dialysis Tubing (a Semi-Permeable Membrane) I. DESIGN A. PROBLEM/RESEARCH QUESTION 1. How does increasing molarity of sucrose affect osmosis through dialysis tubing? B. VARIABLES 1. The independent variable in this lab is the molarity of sucrose each dialysis bag is filled with. The time (30 minutes)‚ the temperature (23C) and the type of dialysis tubing used are all constants. 2. The dependent
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References: Hogness‚ T. R. et. Al. Qualitative Analysis and Chemical Equilibrium. 1966. Holt‚ Renehart and Winston‚ Inc. Collander‚ R. 1937. The permeability of plant protoplasts to non-electrolytes. Transactions of the Faraday Society‚ 33:985–990. Zubay‚ Geoffrey L. Biochemistry 4th ed. 1996. Wm
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Introduction: Predation is an interaction between two species in which one of them uses the other species as food. The Great Blue Heron is a majestic sight‚ which has subtle blue-gray plumage and lives in aquatic habitats. It often stands as it scans for prey or wades really slowly‚ but then‚ they can be as fast as a lightning to grab their food(fish‚ frogs‚ salamanders‚ lizarts‚ small snakes‚ and dragonflies). In this lab‚ we are going to model predation and the effects of changes in the environment
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cells. Reactions vital to life occur under aqueous conditions in the body and cells of all organisms‚ and the concentrations of reactants necessary for these reactions depend upon the amount of water present (Pough et al. 2004). By the process of osmosis‚ water moves from areas of lower to areas higher concentration across a water- permeable membrane‚ like a cell membrane (Nybakken and Bertness 2005). In order to maintain the proper concentrations of reactants and ions within the body‚ organisms
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Priming Affect Crop Stand of Mung Bean Sarhad J. Agric. Vol. 21‚ No. 4‚ 2005 PRIMING AFFECT CROP STAND OF MUNG BEAN Ahmad Khan‚ Shad Khan Khalil*‚ Shakirullah Khan** and Ashfaq Afzal * Department of Agronomy‚ NWFP Agricultural University‚ Peshawar- Pakistan. ** Department of Extension Education and Commutation‚ NWFP Agricultural University‚ Peshawar- Pakistan. ABSTRACT Seed priming had increased germination of several plants particularly vegetables. The effect of PEG 8000 concentrations
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Jhoselyn Adames June/12/2012 Scientific Critique of "_Osmosis Jones_" SYNOPSIS The 2001 film‚ _"Osmosis Jones"_‚ focuses on the representation of the human organism and the daily conflicts a body faces in order to maintain function. The film _"Osmosis Jones"_ is a film that tries to capture the attention of children ages eight to fourteen‚ by exposing the mechanisms of the human body. It is able to reveal the dangers of maintaining an unhealthy diet and some of the consequences that are associated
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