Biology 107 Section 1 11/4/13 Diffusion & Osmosis Introduction The purpose in this experiment was to estimate the osmolarity of potato tuber and celery cells by change of weight.Pieces of potato tuber and celery would be incubated in different sucrose solutions to find out the molarity at which weight of potato and celery tissues do not change. My hypothesis was that the Table 1: Group Data for Experiment:Estimating Osmolarity by Change in Weight Table
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w w w e tr .X m eP e ap .c rs om International General Certificate of Secondary Education CAMBRIDGE INTERNATIONAL EXAMINATIONS BIOLOGY PAPER 1 Multiple Choice 0610/1 OCTOBER/NOVEMBER SESSION 2002 45 minutes Additional materials: Multiple Choice answer sheet Soft clean eraser Soft pencil (type B or HB is recommended) TIME 45 minutes INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write your name‚ Centre number and candidate number on the answer
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Biology has been the most interesting and appealing subject I have taken. Taking the course as a freshman‚ and the AP course as a junior‚ has really influenced my choice of a potential major. The course taught me how to be more studious and efficient with the information I retain. It is a puzzle‚ in which you piece together process by process‚ step by step. AP Biology also enhanced my collaboration skills. The course is very rigorous and challenging‚ and I struggled often trying to do it all by myself
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a semi-permeable membrane is the process of osmosis. If there is a solute and a solvent‚ each containing different concentration levels‚ then the water would move along its concentration gradient until each side of the membrane are equal. The water moves because the membrane is impermeable to the solute and the solute concentrations may differ on either side of the membrane. Water molecules may move in and out of the cell‚ but there is no net diffusion of water. Water will move in one direction or
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Adapted from L. Miriello by S. Sharp AP Biology Guided Reading Chapter 23 Evolution Name __________________________ 1. What is the smallest using of evolution and why is this important to understand? 2. Define the following terms: a. Microevolution b. Population c. Population genetics d. Gene pool 3. What is the Hardy-Weinberg Theorem and why does it appear to be an apparent contradiction to evolution? 4. What is Hardy-Weinberg equilibrium? What are the five conditions for H-W
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AP biology FRQ Courtney DeMane 1.22.13 block 7 A). The chemical composition and structure of proteins seems quite confusing at first but one it is broken down into levels it is much more understandable. Amino acids are the basic building blocks of proteins and they contain amino‚ carboxyl and R groups. These R groups that are in the amino acids are what determine the properties of the specific amino acids. For structure‚ there are 4 levels. The first one being the primary level. These are made
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As discussed in the intro‚ the purpose of this lab is to observe principles of homeostasis and osmosis in action. The results of this experiment showed that eggs placed in a 4 M sucrose solution lost mass over time and had the greatest percent difference in mass compared to the eggs in other solutions‚ with the 4 M egg having an average of -25.13% difference in mass. The 0.0 M solution egg only had a 12.28 average percent difference in mass‚ the 0.5 M egg with 10.39%‚ and the 1 M egg with the least
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AP Biology Summer Assignment Chapter 50.1: An Introduction to Ecology and the Biosphere Ecology is the scientific study of how organisms interact with the environment. When studying Ecology scientists want to know‚ where organisms live‚ why they live there‚ and how many are there. Ecology and environmental biology both stem from Darwin’s interest and observations upon the distribution of organisms and how they adapted to their specific environment. Darwin concluded that the environment interacting
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Biology Open – Ended Investigation Assessment Task 1 Weighing: 20% Due Date: • Part A – Term 4‚ Week 7 Monday‚ 19th November‚ 2012 • Part B – Term 4‚ Week 7 Friday‚ 23rd November‚ 2012 Shamiran Khamis Part 1 – Scientific Report Title: Factors Affecting Enzyme Action Introduction: Enzymes are catalysts‚ because they control the rate of the reaction that helps chemical reactions work properly within living organisms. They are specialised proteins that have a unique shape and chemical
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feasibility of extracts from the adelfa plant as pesticide. The leaves were cut from the stem and then subjected to steam bath. Soxhlet apparatus was used for extraction; methanol was used as solvent. The extract was then distilled‚ and diluted into 4 containers to obtain concentrations of 100%‚ 75%‚ 50% and 25%. There were 6 set-ups‚ each with 10 cockroaches‚ one positive control set-up‚ in which the group used commercial pesticide‚ one negative control set-up‚ containing water‚ and one each
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