concentration than itself‚ the potato chips lost weight. As there was a higher concentration of water molecules inside the potato chip compared to the concentration of water molecules outside the potato chip. It was stated in my prediction that osmosis is the diffusion of water molecules from a high to a low concentration‚ therefore water molecules from inside the potato chip moved out into the solution. Leading to the cytoplasm inside the cells to shrink and become flaccid. As the cells of the potato chip
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Demonstrating osmosis Introduction The movement of water in and out of a system bounded by a membrane permeable to water‚ but not certain other substances‚ can be inferred by either mass changes or volume changes in that system. It is possible to monitor other changes in physical conditions‚ such as texture. Monitoring mass enables quantification of the changes‚ whereas other changes may only be qualitatively measured. Equipment / materials 4 eggs Sugar Distilled water Acetic acid Scales
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Biology Revision summer 2012 1-Characteristics of living organisms Nutrition- taking in of nutrients which are organic substances and mineral ions ‚ containing raw materials or energy for growth and tissue repair ‚ absorbing and assimilating them . Excretion- the removal from organisms of toxic material‚ the waste products of metabolism and substances in excess of requirement . Respiration- the chemical reactions that break down the Sensitivity- The ability to detect or sense changes in the
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one person understood the exercise and communicated that understanding very well. Osmosis and Water Potential in Potato Tissue Melanie Shadish‚ Rob Harris‚ Patricia Tellekamp Water appears to cross the differentially permeable membrane of potato cells by a process called osmosis. The measure of the energy involved in osmosis is called water potential. Since water must lose energy as it moves by osmosis‚ water must move from an area of greater potential to an area of less water potential
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Name________________ Block 4 ______ Pushing the Limits – Strength! For each section: List ONE question that could be answered by the film about each of the different sections and state the answer. Bones Q - How Many bones is your skeleton made up of ? _______________________________________________________________________ A - The Skeleton is made up of 206 bones _______________________________________________________________________ Muscles – Superhuman strength Q- How does
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Biology Lab Report (F.4) * Objective: To study the transpiration of a leafy shoot using the bubble potometer * Materials and apparatus: * Bubble potometer * Leafy shoot * Scissors * Basin with water * A fan * Plumbing tape * Method: Normal Condition: 1. The bubble potometer was filled with water. 2. The stem of a leafy shoot was cut under water. 3. The bottom of the stem was wrapped by plumbing tape. 4. The stem was fitted onto the photometer
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Bio 93 Review Sheet: 1. Understand all the THEMES presented in the introductory lecture (lec 1). 2. What is an open system? Energy in and out‚ comes in and leaves as heat 3. What are the 4 most important elements in the human body? C‚ O‚ N‚ H 4. Draw the periodic square for Helium. How many valence electrons does it have? How do you figure this out using the periodic table? Two valence e-‚ 23He‚ all the way right full shell only holds two electrons 5. What is an isotope? How are they used
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similar that it is hard to distinguish the corresponding difference in phenotype. | D. rerio used for animal development research | 1.) Small Size and can be bred together in high densities- Feasible to breed many D.rerio in a small space. (Research Labs have space constraints for breeding) 2.)Transparent Embryo that develops outside mother’s womb - Observing organ development at various stages is much easier. 3.) Embryo resembles that of higher vertebrates4.) Rapid Development of Embryo- Experimental
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AP Biology Study Guide Chapter 11 1. Categorize chemical signals in terms of the proximity of the communicating cells. Local signaling – a. Paracrine signaling – a secreting cell acts on nearby target cells by discharging molecules of a local regulator (a growth factor‚ for example) into the extracellular fluid. b. Synaptic signaling – a nerve cell releases neurotransmitter molecules into a synapse‚ stimulating the target cell. Long distance signaling- c. Hormonal signaling – specialized
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and Social Change course‚ I had no idea what to expect for our curriculum. Discovering the process of influencing others and group choice has been enlightening for us as a class. Actually‚ Diffusion of Innovation Theory‚ which was developed by Rogers in 1962‚ is one of the oldest social science theories. Diffusion of Innovations seeks to explain how innovations and social changes are taken up with a segmented group of people. Through knowledge and application of research-based theories‚ we have grown
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