short time‚ the final results showed that the more water the potatoes were placed in‚ the more hypotonic the potato becomes. Tonicity is stated to be the state of a solution in respect of osmotic pressure. Types of tonicity used in this lab are osmosis and diffusion. In a way these two solutions are somewhat similar but differ in the way that diffusion refers to the movement of any chemical from one place to another‚
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Overview: Life at the Edge The plasma membrane separates the living cell from its nonliving surroundings. This thin barrier‚ 8 nm thick‚ controls traffic into and out of the cell. Like all biological membranes‚ the plasma membrane is selectively permeable‚ allowing some substances to cross more easily than others. Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins The main macromolecules in membranes are lipids and proteins‚ but carbohydrates are also important. The
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Lab 6: Enzymes . header Purpose: The purpose of this lab is to test for enzyme activity‚ look at enzyme specificity‚ and how temperature affects enzyme activity. Time need to perform this lab: approximately 3 hours Preparation FIRST: Read the lab in its entirety TWICE before you begin. You will perform the experiment‚ write your lab report and include the answers to the additional 4 questions within the text for full credit on this experiment. Materials: •3% hydrogen peroxide •a
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in weight indicates that there has been no net gain or loss of water. This is a means of indirectly finding the osmolarity of the cells themselves. Apparatus 1 large potato Petri dish 7 x 250 ml beakers (disposable cups may be substituted) sucrose solutions: 0.1‚ 0.2‚ 0.3‚ 0.4‚ 0.5‚ 0.6 molar marker razor blade/scalpel forceps cork borer balance (2dp) distilled water paper towels ruler (30 cm) Method 1. Get 100 ml of each of the solutions including distilled water. Place
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Carbon‚ Hydrogen and Oxygen. These three simple elements make up one of the most useful substances for many living organisms: Carbohydrates. Carbohydrates are used for numerous processes in organisms from acting in important roles of cellular recognition in the human body to storing chemical energy in plants in the form or starch. The roles of carbohydrates in the human body alone are numerous; providing energy for working muscles‚ providing energy for the regulation of blood glucose‚ preventing
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[pic] Inorganic ions ➢ Inorganic ions are important for the structures and metabolism of all living organism ➢ An ion is an atom or a group of atom which has overall electric charge. ➢ Inorganic ion are water soluble |Ions |Roles/Functions | |Calcium (Ca2+) |Make teeth and bones | |
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related to each other at the same time. Such methods are crucial for seawater reverse osmosis for what they bring from cost and residence time reductions to the increase in the production quality. 6.1. Pretreatment Various pretreatment methods are used and they include: biofilter‚ subsurface intake systems‚ conventional treatment‚ biological activated carbon‚ and chlorine injection. 6.1.1. Biofilter In reverse osmosis‚ various problems might arise; however‚ the major problem that could be faced is
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Instructions You must SHOW WORK AND PROBLEM SET-UP for CREDIT. You have to SUPPORT your answers by calculations and/or reasoning. If you do not understand something in the assignment or are not sure how to approach a question - EMAIL me before you submit. This assignment must be submitted no later than November 22nd‚ 2011. 1. What is a true solution? Explain why the solute does not settle out of a solution. Is it possible to have one solid dissolved in another? Explain. In metals it would
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Chapters 1-2 Summary and Analysis Sultana was the daughter of a prince of Saudi Arabia. Sultana’s father was the son of Abdul Aziz‚ the first king of Saudi Arabia and the brother of the current king. Sultana grew up in the palace belonging to her father and lived in by her ten siblings and her mother‚ the prince’s first of four wives. Sultana‚ who was not allowed by Saudi culture to write a book of her own‚ told her story to the author of this book who presented it to readers in the first person
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9.2 Maintaining a Balance Contextual Outline Multicellular organisms have specialized organ systems that are adapted for the uptake and transport of essential nutrients from the environment‚ the utilisation or production of energy and the removal of waste products arising from cellular activities. The basis of healthy body functioning in all organisms is the health of their cells. The physical and chemical factors of the environment surrounding these cells must
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