"Facilitated diffusion" Essays and Research Papers

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    Bio lab report osmosis

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    pressure required to maintain an equilibrium‚ with no nett movement of solvent. Osmotic pressure is a colligative property‚ meaning that the osmotic pressure depends on the molar concentration of the solute but not on its identity. Osmosis‚ unlike diffusion‚ requires a force to work. This force is supplied by the solute’s interaction with the membrane. Solute particles move randomly due to Brownian

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    lab 3 a&p 1

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    edition” Elaine N. Marieb; Katja Hoehn Methods: 1. Read entire file twice 2. Read each set of directions 3. Complete each activity Data/Analysis: Activity 1: Review Sheet Results
1. Describe two variables that affect the rate of diffusion.
Your answer:
Increasing the number of membrane carriers and the concentration. 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction?
Your answer:
Because Urea was

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    BIOLOGY – TRANSPORT ACROSS MEMBRANE  define diffusion and describe its role in nutrient uptake and gaseous exchange in plants and humans  define osmosis and describe the effects of osmosis on plant and animal tissues  define active transport and discuss its importance as an energy-consuming process by which substances are transported against a concentration gradient‚ as in ion uptake by root hairs and uptake of glucose by cells in the villi . A cell is surrounded by a layer of cell surface membrane

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    experiments were conducted. These tests were done over simple diffusionfacilitated diffusion‚ osmosis‚ filtration‚ and active transport by changing and observing different variables and how they affect transport through the membrane. Obtained was the understanding of the changing of the molecular weight cut off in a membrane‚ and how it does not play a part directly in changing the rate of diffusion‚ but instead determined if diffusion was accomplishable at all. Knowledge on the size of molecules

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    aiming to witness osmosis in 5  different concentrations of sucrose. I will use 5 varying  concentrations so that I have a wider spread to compare the results‚  and check that I don’t have any anomalies  Prediction  Osmosis is the process of diffusion of water molecules from a weaker  solution into a stronger solution‚ through a semi permeable membrane.  The tiny pores in the membrane of the potatoes will allow the water  molecules to go in and out of the potato cell‚ depending on the  concentration

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    higher the concentration of water in the potato the quicker osmosis will happen because less water will have to diffuse into the potato to even the amounts of water inside and outside the potato. So Osmosis is basically a special kind of diffusion involving water molecules‚ which occurs when two solutions are separated by a partially permeable membrane. The water diffuses from the weaker solution to the stronger solution. Tiny holes in the membrane allow small water molecules to pass

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    Potato Osmosis Lab

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    The purpose of the lab was to investigate osmosis‚ which was successfully achieved because there was a change in the potato’s mass which was due to the net movement of water either into the potato cells or out of the potato cells. In the 0.400M solution‚ the potato decreased in mass‚ this was due to the reason that the solution was hypertonic. There was a higher concentration of solute and lower concentration of water in the solution than there was in the potato cells. This led the water to travel

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    Bio Lab Manuel

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    Exercise 1: Correct Use of the Scientific Method and an Experiment with Macromolecules I. Objectives In this lab‚ students will: a.) Learn how to utilize the Scientific Method to develop a testable hypothesis b.) Generate an effective experimental design from a hypothesis c.) Understand the chemical differences between different macromolecules and how these differences can be used to design tests for each molecule. d.) Identify macromolecules in solutions using chemical analyses. e.) Practice

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    Diffusion of Molecules

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    LAB EXERCISE: Diffusion and Osmosis Laboratory Objectives After completing this lab topic‚ you should be able to: 1. Describe the mechanism of diffusion at the molecular level. 2. List several factors that influence the rate of diffusion. 3. Explain why diffusion is important to cells. 4. Describe a selectively permeable membrane‚ and explain its role in osmosis. 5. Define hypotonic‚ hypertonic‚ and isotonic in terms of relative concentrations of osmotically active substances. 6. Discuss

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    phisiology lab

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    Cell Transport Mechanisms and Permeability: Activity 2: Simulated Facilitated Diffusion Lab Report Pre-lab Quiz Results
You scored 50% by answering 2 out of 4 questions correctly. 1. Molecules need a carrier protein to help them move across a membrane because Your answer : a. they are not lipid soluble.
Correct answer: d. they are lipid insoluble or they are too large. 2. Which of the following is true of facilitated diffusion?
You correctly answered: c. Movement is passive and down a concentration

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