Cell membrane

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  • Tetrahymena Experiment

    the Tetrahymena. The Tetrahymena has a contractile vacuole that protects them from absorbing too much water, causing cytolysis, in which a cell swells up and could result in explosion of the cell. The contractile vacuole expands when water enters it and contracts to release water to maintain equilibrium and to regulate the concentration of water within the cell. The Tetrahymena is placed in different solutions with different concentrations of solute (salt) to see the rate of how fast and how…

    Words: 1363 - Pages: 6
  • The Animal Circulatory System

    In the abdomen, there are series of valves called ostia, which allow hemolymph to enter the heart and get pumped near the hemocoel. In mollusks, the hemolymph uses hemocyanin to carry oxygen. The oxygenated hemocyanin is blue. It is not part of any cell, it just hangs within the…

    Words: 1271 - Pages: 6
  • The Role Of Macromolecules In Eukaryotic Cells

    Eukaryotic cells are cells whose nucleus is bound by a membrane; these cells contain organelles, which are structures each enclosed within its own membrane found only in eukaryotic cells, each organelle has a specific function inside a cell. One type of organelle is a lysosome, which are the organelles that dispose of waste and toxins. Lysosomes are fluid filled sacks which range in size from 0.1 to 1.2 micrometres and contain around fifty degradative enzymes that enable it to effectively…

    Words: 1150 - Pages: 5
  • Potato Lab Report

    placed in concentrations of 0.0 and 0.1M of glucose. At these two concentrations, a hypertonic environment was observed within the segment cells. The percent change in mass of the potato cells is negative when placed in concentrations of over 0.3M to 0.4M, 0.5M, and 0.6M of sucrose. At these three concentrations, a hypotonic environment was observed within the cell. According to the data, a line of best fit crosses the x-axis where an isotonic relative osmotic concentration is achieved. An…

    Words: 1302 - Pages: 6
  • Diffusion In Agar Cubes Experiment

    Diffusion in Agar Cubes Experiment Introduction Diffusion is a paramount process to organisms because molecules enter the body cells and waste products are removed. Diffusion is the movement of particles from regions with dense areas to regions with lower density. Diffusions rate can be determined by many factors this includes, the size, synthetic composition, concentration gradient, surface area to volume ratio. The independent variable in this experiment is the size of the agar, this means…

    Words: 865 - Pages: 4
  • Efflux Research Paper

    cause of multidrug resistance, especially in Gram negative organisms.45 As many of these proteins are not expressed constitutively, it may be hard to predict the effect these complexes have on in-vivo treatment; many are tightly regulated to maintain cell homeostasis, and alterations to the control of these systems can cause drastic changes in resistance. The genes encoding efflux proteins can be both chromosomal and harbored on plasmids, making it possible for horizontal transmission…

    Words: 1114 - Pages: 4
  • Essay On Potato Osmosis

    Destiny Mckenzie Teresa Elam, Emily Meyers,Carlee Brogdon The Replication of Osmosis in Cells Introduction: The differences between osmosis and diffusion is slight, but osmosis is the movement of water molecules from high concentration to low concentration, when diffusion is necessarily the same concept albeit without water molecules.Osmosis and Diffusion occur to achieve equilibrium in the cell; to maintain the cell’s homeostasis.Within the experiment two types of solutions were present:…

    Words: 683 - Pages: 3
  • Membranes

    A membrane is defined as a thin sheet, film, or layer, which works as a selective barrier between two phases that can be liquid or gas.113 In other words, a membrane is an interface between two adjacent phases acting as a selective barrier, regulating the transport between the two components.114 Membranes have gained an important place in chemical technology and are used in a broad range of applications.115,116,117 The key property that is exploited is the ability of a membrane to control the…

    Words: 1540 - Pages: 7
  • Diffusion Across Plasma Membrane Lab Report

    Diffusion Across a Plasma Membrane Lab The purpose of this lab was to learn about the permeability of plasma membranes. In this experiment, dialysis tubing was used to simulate the semipermeable plasma membrane of a caterpillar’s intestine. Cooked starch was prepared and mixed with the enzyme amylase to simulate the mixing of the caterpillar’s saliva with a starch/leaf and then placed in the dialysis tubing to simulate the beginning of the digestive process. The enzyme amylase breaks down…

    Words: 1273 - Pages: 6
  • Compare And Contrast Graded Potentials And Action Potential

    Resting membrane potential is the difference in voltage of the fluids inside a cell and outside a cell and the membrane is said to be polarized. According to the book the value of the resting membrane potential varies from -40 mv to -90 mv in different types of neurons. There are two essential factors that build and generate the resting membrane potential: the differences in the ionic composition of the intracellular and extracellular fluids, and the differential permeability of the plasma…

    Words: 824 - Pages: 4
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