Biology Lab Report - Movement in and out of cells (4A) Shiang Chen Ting (24) Sec 313 Introduction The aim of this experiment is to explore the factors which affect the movement of materials in and out of the cells. The dark red or purple colour of Beetroots is caused by a pigment called betalain that is found within the vacuole of the beetroot cells. The pigment remains intact within the cell if the cells are not “stressed” by the external environment. In this exploration‚ two factors that affect
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against the gradient‚ it is active and requires energy. Passive transport describes the movement of substances down a concentration gradient and does not require energy consumption. There are many types of passive transport‚ for example: Diffusion‚ diffusion is the net movement of substances from an area of higher concentration to an area of lower concentration. This movement occurs as a result of the random and constant motion characteristic of all molecules‚ atoms‚ or ions (due to kinetic energy)
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down its concentration gradient from the air to the blood‚ while at the same time carbon dioxide can diffuse down its concentration gradient from the blood to the air. The sheer number of alveoli inside the lungs means that the surface area for diffusion to take place is huge. In humans‚ carbon dioxide waste is breathed out through the lungs. Ammonia produced from cells is converted to urea as it is much less toxic and is excreted through the kidneys. Fish: Gas exchange is more difficult
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*Passive processes Diffusion: The Principle Diffusion – When molecules and ions level out concentration. Equilibrium – When the substance is evenly spread out through the substance and the concentration gradient disappears. Simple Diffusion – Substances diffuse across the membrane in one of two ways: Lipid-soluble substances diffuse through the lipid bilayer. Ions diffuse through the pores of ion channels formed by integral proteins. Facilitated Diffusion – When substances that cannot
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Using dialysis tubing to model diffusion of a cell membrane and investigating the influence of solute concentration on osmosis Purpose * Discover how dialysis tubing diffuses the cell membrane * Explore the effect of solute concentration on osmosis Background A cell membrane is a very significant function in the human body. In one sense‚ it is used as a barrier to keep the enzymes‚ DNA‚ and metabolic pathways that bundles everything together. Cell membranes are also used as a gateway
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Lab Activity No. __ Diffusion and Osmosis I. Introduction Diffusion is the transfer of molecules (or ions) from an area of higher concentration to a lower concentration‚ while osmosis is the transfer of water from a higher concentration to a lower concentration. II. Objectives 1. Demonstrate diffusion and osmosis across membrane. 2. Examine the relation of membrane permeability to diffusion and osmosis. III. Materials 2 thistle tubes‚ 2 big beakers‚ 4 tube clamps to fit iron stands
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experiment was to observe the process of diffusion of substances across a semipermeable membrane to gain a better understanding of how cells move materials across cell membranes. The experiment was designed to exhibit Brownian Motion; the random movement and tendency of particles of a substance to move from an area of greater concentration to lower concentration via diffusion until equilibrium has been attained. In addition to observing the passive process of diffusion‚ the experiment demonstrated how a
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basic facts. We define diffusion as movement of materials from a region of higher concentration to a region of lower concentration. This movement is due to kinetic energy of particles. An example of this can be observed by opening a bottle of perfume. Soon you will smell the perfume in distant parts of the room. It diffuses from the high concentration of molecules in the bottle to a lower concentration of molecules in the air. Osmosis is a type of diffusion. It involves movement of
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in determining what they eat. 3.) What is the significance of a membranes being selectively permeable? It allows the cells to control its internal environment. Check and Challenge p 85 1. What is a concentration gradient? How does it affect diffusion? Concentration gradient is a difference in the concentration of molecules across a membrane or a distance. Diffision is a basic process that allows molecules to movr into and out of the cell‚ which is possible with the concentration gradient.
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Aim: To observe and describe an example of osmosis. Hypothesis: I predict that the water level will rise as the iodine stained water moves through the cellulose bag due to osmosis. The iodine is there so we can see this happening. Materials: * Dialysis(cellulose) tubing * Thistle funnel * Gas jar * Retort clamp and stand * Rubber bands * 50mL beaker * Iodine/potassium iodine solution * 5% starch solution Method: 1) Fill the gas jar to 3 quarters full with
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