Introduction Diffusion and osmosis are two types of passive transport. Diffusion is a random movement of molecules from an area of high concentration to an area of low concentration. Osmosis is a type of diffusion that diffuses water through a selectively permeable membrane. There were two parts to the experiment‚ the dialysis tubing lab and the potato lab. In the first experiment‚ the dialysis tubing acted as a semi-permeable membrane. A semi-permeable membrane is a membrane
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Biology Lab #1: Chemical Diffusion Purpose To discover how the size of a cell affects the diffusion of chemicals throughout the cell. Hypothesis I predict that as the cell size increases the diffusion depth and the diffusion rate will decrease. Equipment • Eye protection • 250 mL beaker • Timing device • Scoopula • Ruler • Scalpel • Sodium hydroxide solution • 3 different sized cubes of phenolphthalein agar • Paper towels Purpose
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Lab # 2 Diffusion & Osmosis Introduction Kinetic energy‚ a root of energy stored in cells‚ causes molecules to hit into each other and move in new directions. Diffusion is the result of this contact. Diffusion is the random movement of molecules to an area of lower concentration from an area of higher concentration. Osmosis is a type of diffusion. This is the diffusion of water through a selectively permeable membrane from a region of higher water potential to a region of lower water
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Lipids and Phospholipids The main role of phospholipids is that they can form lipid bilayers. It is an amphipathic molecule. The head which is hydrophilic contains a group of phosphate‚ a diglyceride and a simple molecule e.g. choline. The tail is hydrophobic and is made up of fatty acids. Phospholipids receive and transmit signals across the cell membrane and act as a store room for energy. The main role of phospholipids is that they can form lipid bilayers. It is an amphipathic molecule. The
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Geography – Unit One Notes What is Geography? Geography is the study of the world‚ how it works‚ and how people use and change the world as they live in it. Origins The word “Geography” comes from the Greek word “Geo.” Meaning earth and “graph” meaning writing. Definitions Population Denisty – Figure calculated by dividing the population of a region by the region’s area. Staristical Analysis – Studying collected data for the purposes of summarizing information to make it more usable and
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Similarities and Difference of the Role of Physical Geography in the Shaping of Ancient Egypt and Mesopotamia During the Bronze Age physical geography played many roles in the shaping of Ancient Egypt and Mesopotamia. Ancient Egypt and Mesopotamia had many differences but also had their similarities. Their water sources‚ resources‚ protection‚ and the society all affected how these civilizations lived. Physical geography played an important role in the shaping of the civilizations of Ancient
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St Ivo School Geography Department - GCSE REVISION Solar Output – variations in amount of energy given off by sun – sunspots can affect solar output – e.g. reduction in sunspot activity between 1645-1715 likely cause of Little Ice Age Orbital Geometry – earth’s orbit of the sun varies in shape – when circular glacial periods have occurred‚ when elliptical warmer periods result (Milankovitch Cylces) www.geobytesgcse.wordpress.com Name and describe 2 external factors which affect climate change
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From the first traces of civilization‚ geography has played an immeasurable role in the structure‚ function‚ and culture of the peoples it has affected. It can be accredited with the greatest migrations in history‚ the comities of neighboring countries‚ and the need for civilizations to adapt. Geography has forever molded the actions taken by governments‚ and the policies they have adopted. It is often advantageous‚ but no more can it be rancorous. The geography of East and Southeast Asia specifically
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Geographies of social difference WESTIES‚ SURFIES AND BOGANS: SPACE AND STIGMA IN THE MEDIA DR DALLAS ROGERS SCHOOL OF SOCIAL SCIENCES AND PSYCHOLOGY LECTURE OVERVIEW 1. Textbook reading: • • Post-structuralist thought Analysing geographies of difference 2. Stigma‚ the media and place attachment: • • • Territorial stigma Place attachment Place defending 3. Case studies: • • • Housos The Shire The Bra Boys d.rogers@uws.edu.au EXPLANATIONS CONCERNED WITH DIFFERENCE
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The effect of size on the effectiveness of diffusion Aim: To use agar blocks infused with 0.1 Molar sodium hydroxide (NaOH) and phenolphthalein to investigate the relationship between shape and surface area: volume ratio on the effectiveness of diffusion. Hypothesis: That for a cube of agar‚ the time taken for complete colourisation due to diffusion of HCl is directly proportional to the cubes volume. Materials: |A block of agar (10cm x 5cm x 3cm) with 0.1M NaOH and |1x 250mL
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