normal flaccid plasmolysed Cell gains water and become turgid (stiff and hard)‚ does not explode because of the rigid cell wall. Cells lose water and become flaccid (floppy). If it keeps loosing water‚ water leaves the vacuole and membrane pulls away from wall. Becomes plasmolysed. Excytosis adds to the cell membrane while endocytosis removes part of the cell membrane. Paramecium Osmoregulation. This is the control of water inside a cell or organism. It is very important if
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TOPIC 1- INTRO TO CELL BIOLOGY Cell Theory: 1) all organisms consist of one or more cells 2) the cell is the basic unit of structure for all organisms (Theodor Schwann) 3) all cells arise only from pre-existing cells (i.e cell= basic unit of reproduction) (Rudolf Virchow) Cells have enormous diversity (function and size)‚ but have unity (similar basic chemistry i.e DNA‚ ATP‚ metabolism‚ etc.) ** units: 1µm= 10-6m‚ 1nm= 10-9 m (typical prokaryote is 1-5µm‚ typical eukaryote is 10-30 µm)
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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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Discussion: Osmosis is a passive process by which water molecules move through a partially permeable membrane from a region of high concentration to a region of low concentration‚ creating an equal amount of molecules from both regions on each side of the membrane. This process is the result of a downhill energy system known as water potential. Water potential is the potential energy of water (per unit volume) that allows it to move from one area to another by osmosis. This system causes the water
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Write-up Part 1- Purpose: Why did we do the experiment? The purpose of this experiment was to understand how osmosis works and that the cell membrane is selectively permeable. Osmosis is the diffusion of water molecules through a selectively permeable membrane. Many cells cannot function without adequate water‚ so cells depend on osmosis. When a cell is selectively permeable‚ it means some substances can pass through while others can’t. Many examples of these were shown throughout the experiment
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Worksheet 2 1. a) Define a cell. b) What is a unicellular organism? c) Can a cell be multicellular? a) Cell: Smallest unit that displays the properties of life; always contains cytoplasm surrounded by a plasma membrane. b) Unicellular Organism: An organism that consists of only one cell‚ unlike a multicellular organism that consists of multiple cells. c) No single cell is multicellular; however‚ it has been noted that a cell can evolve and become multicellular. 2
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Active and passive transport are the ways in which cells allow things to move into and out of the cell through the cell membrane. They include many different ways to transport things. Passive transport requires no expenditure of energy by the cell. However‚ Active transport requires ATPs which have energy in order for it to move something through the cell membrane. There are different types of transport to suit the sizes of molecules as well. Passive transport includes diffusion‚ osmosis‚ and
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concerned‚ they are all made up of cells whereas‚ the membrane surrounds all those cells. The cell membrane has the key responsibility to maintain a stable interval environment. Even though‚ Cell membrane is made up of phospholipids bilayer and has that great amount flexibility making it unbreakable while transportation of substances. However‚ certain substances such as‚ dissolved gases‚ sugars‚ salt and liquid find it difficult to pass through the cell membrane and‚ Substances like Oxygen and‚ Carbon
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Definition integral membrane protein Term If the direction of the net flux of an ion is against its electrochemical gradient‚ then that transport is passive. Definition False Term Of the gradients listed below‚ which is the most accurate description of the force that ultimately determines the movement of ions across the membrane? Definition Electrochemical gradient Term Which of the following pairs of characteristics is more likely to make a substance diffuse through the cell membrane? Definition
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Chemotaxis‚ the guided movement of cells by chemical gradients created by chemoattractant proteins‚ such as chemokines and bacterial products produced at the site of inflammation‚ probably emerged early in eukaryotic evolution {Kay‚ 2008 #3289}. Neutrophils are highly mobile cells that readily undergo chemotaxis. Neutrophils can detect as low as 1/100th of a chemokine gradient. They polarize their migration towards bacterial peptides over a pool of other chemical gradients to reach sites of inflammation
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