Simple diffusion The term simple diffusion refers to a process whereby a substance passes through a membrane without the aid of an intermediary such as a integral membrane protein. The force that drives the substance from one side of the membrane to the other is the force of diffusion. In order for substances to pass through a cell membrane by simple diffusion it must penetrate the hydrophobic core of the phospholipid bilayer. The types of molecules that can do this are themselves substantially
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Discuss the structure of the plasma membrane and explain the process of active and passive transport through the membrane. 2. Explain your observations in detail in terms of concentration gradient‚ diffusion‚ osmosis‚ osmotic pressure‚ passive transport‚ and active transport. Explain what happened to the blood cells at the various levels of concentration. Be sure to refer to the solutions as being hypotonic‚ hypertonic and isotonic. The plasma membranes are made up of proteins that form pores
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Joseph’s Story Jalisa Cason A&P 1 Unit 2 case study B. Cellular processes and membrane functions that will be affected if Joseph’s heart stopped would be as follows. Oxygen‚ glucose‚ and essential ions that are required for the heart to pump will slow down. Each of his cells will have to work harder and faster which uses up his energy supply. Carbon dioxide levels inside the cells will rise‚ which causes his PH to drop. The mitochondria will run out of oxygen and glucose to make essential ATP
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Choice 1. a. b. c. d. e. 2. a. b. c. d. e. 3. a. b. c. d. Cellular Level of Organization What are the three main parts of a eukaryotic cell? Plasma membrane‚ organelles‚ cytoplasm Plasma membrane‚ organelles‚ nucleus Plasma membrane‚ cytoplasm‚ organelles Plasma membrane‚ cytoplasm‚ nucleus Plasma membrane‚ cytosol‚ organelles Plasma membranes consist of what three components? Phospholipids‚ glycoproteins‚ water Proteins‚ cholesterol‚ fatty acids Cholesterol‚ fatty acids‚ glycolipids Proteins
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BRIEF INTRODUCTION: Beetroot cells contain a red pigment stored in the cell vacuole in the membrane to prevent leaking out from the cell. In this experiment we used several solvents to calculate which one made the cell release more pigment. RESULTS: A table showing the results of the intensity of the color and the absorbance of the liquids with the different solvents. Solvent Results from colorimeter 0.001 Acid (Hydrochloric) 0.358 Ethanol 0.132 Hot water 0.984 Cold water-distilled
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cytoplasm‚ plasma membrane‚ ribosomes‚ nucleoid‚ flagellum‚ lacks organelles)‚ DNA is circular and single chromosome. (ex.= bacteria) Eukaryotes: multicellular (protists‚ fungi‚ animals‚ plants) use compartmentalization of cellular functions and transport systems (cytoskeleton) to accommodate size. ** Similarities btwn eukaryote and prokaryote: plasma membrane‚ electron transport chain‚ transcription/ translation machinery (relies on ribosomes) Organelles Cytoskeleton (non membrane bound) Support/shape
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Introduction: The purpose of the laboratory investigation was to observe the diffusion of water across a semi-permeable membrane. In this lab‚ dialysis tubing was used to represent the semi-permeable cell membrane. Three dialysis tubes were prepared with 5% sucrose solution and were soaked in solutions of different concentrations. The diffusion of water across a semi-permeable membrane is called osmosis. When water diffuses‚ the water molecules move from a hypotonic environment to a hypertonic environment
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against a high to low concentration gradient through the visking tubing which is not osmosis as it is the movement of particles rather than as the molecules were able to move through the semipermeable membrane whereas the sucrose solution particles are too large to diffuse through the semipermeable membrane of the visking tubing so they remain within the tubing. This causes the dye to move from within the tubing and out to the water and stain it with the dye colour while as the water moves into the tubing
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Abstract: Osmosis is the transport of water across a selectively permeable membrane from a region of a higher water chemical potential to a region of lower water chemical potential. (Tzahi 2006) To demonstrate osmosis lab‚ artificial cells were made with various sucrose concentrations and were placed into beakers of different sucrose solutions. Overall the results showed that the higher percentage of concentration gradient of sucrose‚ the more the artificial cells absorbed. Introduction: The
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individuals with the severe form have short stature‚ delayed sexual development‚ and skeletal abnormalities. Mutations in at least five genes can cause spherocytosis. These genes provide instructions for producing proteins that are found on the membranes of red blood cells. These proteins transport molecules into and out of
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