Anthony Bryant Human Biology September 23‚ 2011 Tracing the Scientific Method 1. While the hypothesis is never explicitly stated‚ it is safe to assume that the researchers’ hypothesis is that coffee does in fact‚ prevent the development of high blood sugar. The question used to form this hypothesis was‚ does the ingestion of coffee prevent the development of hyperglycemia in mice? 2. The control group in this study would be the 11 mice that were given the water. They would be considered the
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in a leaf and interpret the chromatogram. Hypothesis If I am to put a chromatography paper into a solvent‚ then it would separate the pigments depending on their Rf value. I think the pigments will separate in this order: Chlorophyll A‚ Chlorophyll B‚ Carotene‚ and Xanthophyll. Introduction Chlorophyll is the molecule that absorbs sunlight and uses its energy to synthesize carbohydrates from CO2 and water. This process is known as photosynthesis and is the basis for sustaining the life processes
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Introduction The purpose of this lab is to determine which pigments in a plant support or effect photosynthesis‚ based on starch production‚ which wavelengths of light are involved in photosynthesis‚ and identify plant pigments found in a plant leaf by means of paper chromatography. Life on Earth is dependent entirely on the energy from the Sun‚ not only to keep the planet at a suitable temperature but also to provide the energy required to sustain life. The energy of the Sun‚ in the form of
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are made when they are needed in the exact amount. An enzyme lowers the activation energy of a reaction so its easier to proceed. Enzymes are specific to which substrates it binds with to the active site.(AS biology‚ 2008). There is a lock and key hypothesis‚ as shown in diagram 1: (http://www.skinnersbiology.co.uk/enzyme.htm) the aim of this practical is to determine the activation energy of hydrolysis of
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Through this experiment‚ Egeria densa was observed using a microscope. The task was to observe and identify the different types of cell‚ cytoplasmic streaming‚ and plasmolysis of Egeria densa. First‚ the microscope was examined and investigated to master the use of the equipment. A microscope slide grid which was on the slide glass was required to be seen clearly using 4x‚ 10x and 30x. During the latter part of the experiment‚ the Egeria densa was observed using the microscope to understand the
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BIOLOGY DCN PHOTOSYNTHESIS LAB # 6 Effect of varying coloured filters on the photosynthetic rate of spinach chloroplasts The data below is just representative of what trends and relationships you were supposed to see. Numbers can vary. Absorbance at 620 nm for each treatment DCPIP + chloroplasts t=0 min. 0.93 0.945 0.905 0.915 t=3 min. 0.95 0.731 0.83 0.816 change in A620 -0.02 0.214 0.075 0.099 t=0 min. t=3 min. change in A620 t=0 min. t=3 min. change
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The majority of the experimentation in this project relied on the idea that there is a relationship between concentration and absorbance of a solution. This is easy to understand if you can visualize the particles in the solution; and this is especially true if the particles in solution portray a distinct color. The more particles there are in the solution‚ the more they will obstruct the path of the light. This occurs the most at the analytical wavelength‚ where the most light is absorbed by
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AP Biology Photosynthesis Lab Bethany Boyer Due 11/12/14 Lab Write-Up Questions First Experiment 1) The independent variable in this experiment was the presence of CO2 (carbon dioxide). The dependent variable was the speed at which the leaf disks started to float. 2) In the leaf tissue‚ the bicarbonate and light are combining to carry out photosynthesis. This will cause oxygen to collect in the leaf tissue‚ causing it to rise. 3) If we were to boil the leaf disks‚ the reaction would most likely
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Based off the results from this lab the student was able to determine and have an overall better understanding of the variables that affect the rate of photosynthesis in a plant. The first variable the student tested in the lab was 30cm of light with CO2 present. The student started this trial with all 10-leaf disks and timed how many leaf disks came up every minute for 15 minutes. One minute into the trial and the student recorded that no leaf disks had yet to rise to the top of the solution. At
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PHOTOSYNTHESIS & CELLUAR RESPIRATION LAB REPORT % Absorption 400 425 450 475 500 525 550 575 600 625 650 675 700 Average 47 44 37 27 14 10 8 9 9 10 15 17 14 Use the graph of Average % Absorption for Grass Pigments to answer the following questions. ANSWER ONLY THE QUESTIONS BELOW. YOU WILL LOSE POINTS IF YOUR ANSWER INCLUDES UNRELATED INFORMATION. 1. What specific range of wavelengths explains why grass is green? The absorption of all wavelengths outside approximately
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