are different types of transport to suit the sizes of molecules as well. Passive transport includes diffusion‚ osmosis‚ and facilitated diffusion. Diffusion is a net of movement of molecules from an area of high concentration to an area of low concentration that doesn’t require energy. It moves molecules such as oxygen into the cells and carbon dioxide out of the cell. Osmosis is the diffusion of water across a semipermeable membrane. It occurs because of the concentration of a solute in a solution
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Passive Transport- Diffusion‚ from high to low concentration‚ small non-polar particles fit between phospholipids 2. Facilitated Transport (a.k.a facilitated diffusion)- Diffusion‚ uses a channel protein‚ large or charged particles a. Ex: Fructose‚ amino acids 3. Active Transport- Pushing particles from low to high concentration (against the gradient)‚ uses a carrier protein 4. Vesicle Formation or Membrane assisted transport- Compounds enter/exit in vesicles A. Diffusion- any small and not
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D. concentrate During diffusion molecules tend to move _____________________ A. up the concentration gradient B. down the concentration gradient C. from an area of lower concentration to an area of higher concentration D. in a direction that doesn’t depend on concentration When the concentration of a solute inside and outside a cell is the same‚ the cell has reached___________. A. maximum concentration B. homeostasis C. osmotic pressure D. equilibrium The diffusion of water across a selectively
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Name: Yvette Exercise 1: Cell Transport Mechanisms and Permeability: Activity 3: Simulating Osmotic Pressure Lab Report Pre-lab Quiz Results You scored 50% by answering 2 out of 4 questions correctly. 1. Which of the following is true of osmosis? Your answer : b. Movement is against the concentration gradient of water. Correct answer: c. It is a type of diffusion. 2. Which of the following occurs when a hypertonic solution is added to cells? You correctly answered: d. The cells shrink. 3. The variable
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the cell membrane depending on the arrangement and features of the membrane lipids and proteins. Simple diffusion is the movement from area of higher concentration to areas of lower concentration. This is an example of passive transport. Osmosis and facilitated diffusion are known to be other examples of passive transport. Osmosis occurs when water molecules are diffused and facilitated diffusion is when a molecule can’t pass freely across the cell membrane with requiring one of the two proteins: carrier
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channel down middle. – ions and small polar molecules. Gated Non-Gated Carrier Proteins: pass molecule through by combining with it; shape specific -Sugars/amino acids -Depending on ion concentration -Movement of molecules if facilitated -Diffusion work facilitated: moving molecules from high concentration to low concentration. Cell Recognition Proteins: glycoproteins Receptor Proteins: shape specific; specific molecule binds‚ shape changes‚ triggering cellular response. -Cause the sodium to
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gradient and electrical effect move it into the cell. 10 PASSIVE: Facilitated diffusion Polar organic solutes (glucose‚ amino acids) are hydrophilic: diffuse through membrane with the help of carrier proteins: • In direction of electrochemical gradient • Facilitated because faster than simple diffusion • Reversible and non-covalent binding PASSIVE SOLUTE TRANSPORT - SUMMARY • Passive transport moves towards the electrochemical
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result. Activity 2 1. Neither way requires ATP but facilitated diffusion requires carrier protein molecules for diffusion to occur. 2. By increasing the number of carriers more glucose can pass at a time increasing the rate‚ as predicted. 3. It won’t change since the concentrations are the same and the transport proteins are glucose carriers. The rate did not change because sodium chloride doesn’t help nor hinder the diffusion of glucose. Activity 3 1. The pressure will increase
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Diffusion to the cell membrane Cells must acquire needed ions and molecules from their surrounded extracellular fluid meaning that they must be transported through the cell membrane. This happens by diffusion‚ which is movement of substances from a high concentration to a lower one through a partially permeable membrane. As ethanol would also be surrounding the cell in a high concentration‚ it would also be diffused therefore destroying the permeability of the cell membrane. Diffusion is also
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AP Reading Guide Fred and Theresa Holtzclaw Chapter 7: Membrane Structure and Function Name_______________________Period___________ Chapter 7: Membrane Structure and Function Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins 1. The large molecules of all living things fall into just four main classes. Name them. 2. Explain what is meant when we say a molecule is amphipathic. 3. In the 1960s‚ the Davson-Danielli model of membrane structure was widely
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