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Osmosis

AP Biology Diffusion and Osmosis Lab Report

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AP BIOLOGY Diffusion and Osmosis Lab Report Lab #4 Amena Nausheenn Anum Raki Ravi Patel . Period 6/7 ? Diffusion and Osmosis Lab Report Lab #4 Ravi Patel Amena Naushin and Anum Raki Purpose:

Ch. 7 Membrane Structure and Function

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Ch. 7 Membrane Structure and Function Plasma membrane separates living cell from its surroundings Controls traffic into and out of the cell it surrounds Selectively permeable: allows some substances to cross easier than others One of the earliest episodes in the evolution of life may have been the formation of a membrane that enclosed a solution different from the surrounding solution while still permitting the uptake of nutrients and elimination of waste products. Ability of cell to discriminate in chemical exchanges with its environment is fundamental to life Lipids and proteins are the staple of membranes; carbohydrates are also important Phospholipid is amphipathic meaning it has hydrophilic and hydrophobic regions

Cellular Transportation Overview

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Cellular Transportation Josey Nelson Introduction Helps in maintaining homeostasis Two types: Passive Transportation No energy required Two main types High to low concentration Active Transportation Uses ATP for transportation Low to high concentration Diffusion The movement of particles from high concentration to low concentration Purpose: to reach equilibrium Osmosis is diffusion of water 3 major types Diffusion of ions Diffusion of molecules Osmosis (diffusion of water) Facilitated Diffusion Uses proteins to transport ions and molecules High to low concentration Requires Carrier Proteins No ATP (energy) Types of Solutions Hypotonic: a solution that contains higher water concentrations in solution

Campbell Biology Ch 7 Study Guide

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CHAPTER 7 MEMBRANE STUCTURE AND FUNCTION Membrane Structure Explain the meaning of the statement that phospholipids and most other membrane constituents are amphipathic molecules. It means that they have both a hydrophilic region and a hydrophobic region. Explain how the fluid mosaic model of a membrane is structured and the evidence that supports the model. The membrane is a fluid structure with a mosaic of various proteins embedded in or attached to a double layer of phospholipids. Using freeze-fracture to study cells under an electron microscope has shown a pattern that appears to agree with the fluid mosaic model. Describe the fluidity of the components of a cell membrane and explain how membrane fluidity is influenced by temperature and membrane composition.

Osmosis

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OSMOSIS PRACTICE THESE!!! Question 1Which diagram shows a cell in a hypotonic solution? A. B. C. Question 2Which diagram shows a cell in a hypertonic solution? A. B. C. Question 3Which diagram shows a cell in a isotonic solution? A. B. C. Question 4 Please answer the following questions regarding if a red blood cell were placed in ocean/sea water. Where is the greatest concentration of water? a.inside the cell b.outside the cell c.equal inside and outside the cell Question 5 Please answer the following questions regarding if a red blood cell were placed in ocean/sea water. Which way is water moving? a.more into than out b.more out than in c.water is not moving d.both directions in equal amounts Question 6

Egg Mystery Lab - Osmosis

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Raw Egg Mystery Lab Purpose: Conduct an experiment in which you quantitatively and qualitatively demonstrate the effects of materials moving into and out of a semi-permeable membrane, an egg. Materials: 1 egg Balance Water Vinegar Beaker String Corn Syrup Ruler Safety: Wash hands after handling eggs. 2) Eggs are very fragile. Write the following: What will happen to an egg (cell model)placed in the following solutions? (Must be stated in ?If/then? format.) Vinegar Solution: __________________________________________________________________. Water:____________________________________________________________________________. Sugar:____________________________________________________________________________. Procedure: Day 1:

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