Diffusion and Osmosis Diffusion The exchange of substances between cells and the environment occur in ways that require metabolic energy (active transport) and in ways that do not (passive transport-Energy from natural‚ inbuilt motion of particles). Diffusion is an example of passive transport. Diffusion is the net movement of molecules or ions from a region where they are more highly concentrated to one where their concentration is lower. Figure 1 Figure 2 Diffusion is only
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therefore bound a membrane that acts the selective controller of the movement of different substances to and from the cell. This is especially when dealing with the solutes both to and from the cell. Some solutes must be allowed to move into and out of the cell depending on the need and urgency of the very solutes. This membrane is considered to selectively permeable to different solutes and thus will only allow the passage of specific solutes to and from the cell. This implies that the membrane to most cells
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type of passive transport is diffusion. Diffusion is the movement of molecule across the membrane from high to low concentration. Diffusion naturally occurs until equilibrium is reached. Only very small molecules can cross the membrane in diffusion. These include ions‚ gases‚ alcohols‚ and small lipids. The next type of passive transport is osmosis. Osmosis is the diffusion of water across the cell membrane. Three examples of osmosis are hypertonic‚ hypotonic‚ and isotonic solutions. A hypertonic
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Chapter 2 IB Biology 2.1 Cell Theory 2.1.1 Outline the cell theory (2). • All organisms are composed of one or more cells • Cells are the smallest units of life • All cells come from preexisting cells • TOK: cell theory replaces the former ideas of spontaneous generation or abiogenesis in which inanimate matter assembles itself into living forms • Exception: muscle cells- more than 1 nucleus‚ very long; (fungal cells) hyphae roots- not a single unit; protoctista- not specialized to single
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why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your prediction? Your answer: If extracellular K+ is increased then the intracellular K+ will decrease. Fewer intracellular K+ ions would result in the membrane potential being less negative. This is what I predicted to happen. 3. Explain why a change in extracellular Na+ did not significantly alter the membrane potential in the resting neuron? Your answer:
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The first lab will investigate the movement of glucose and starch across a selectively permeable membrane through a process of diffusion. The movement of a solute through this membrane is called dialysis . Diffusion is a form of passive transport. It is the movement of molecules from areas of higher concentration to those of lower concentration‚ until there is an even concentration. This movement is random because it is a result of kinetic energy. Diffusion is a slow process‚ but there are many factors
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its plasma membrane is affected and may change in structure resulting in the leaking of betacyanin. If the temperature changes‚ then I would expect to observe that there would be a change in the concentration of betacyanin that has leaked from a beetroot cell. In specific‚ at high temperatures‚ the phospholipids that make up the plasma membrane of the beet root cell become progressively more destabilized causing them to transform into a liquid state. As this occurs‚ the plasma membrane ruptures allowing
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Each main component has its own‚ individual function which helps a cell to function and maintains the cell membrane. The components that I will be describing include the cell membrane‚ nucleus‚ cytoplasm‚ mitochondria‚ lysosomes‚ Golgi bodies‚ centrioles‚ endoplasmic reticulum (both smooth and rough) and ribosomes. The cell membrane - The cell membrane is also known as the plasma membrane and is located on the surface of all typical animal cells‚ it is covered by a double layer of phospholipid
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unwanted vegetation like weeds‚ grasses‚ and broad leaf plants (http://onlinelibrary.wiley.com/doi/10.1111/j.1399-3054.1982.tb04545.x/full). The purpose of this lab is to look at different effects of paraquat toxicity which causes changes in the lipid membrane bilayer of chlorosplasts (makes it leaky) and the formation of malondialdhyde in the bean Phaseolus vulgaris‚ by isolating the choloroplast‚ determining the chlorophyll concentration‚ determinating the protein amount by making a standard curve
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has stopped‚ what cellular processes and membrane functions are going to be affected by the loss of oxygen‚ blood glucose‚ and waste removal? Without the heart pumping‚ oxygen and blood glucose won’t reach the vital organs of the body that need them for sustenance. Eventually without the ability to produce ATP the body’s cells will die. C. Which intracellular organelles have membranes as part of their structure? How would the breakdown of the membranes of these structures affect the function
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