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Introduction to Science

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Biol103Lab1.docx Download Attachment;Your Full Name;Biology 102/103;Lab 1: Introduction to Science;INSTRUCTIONS;and submit it via the Assignments Folder by the date listed in the Course;Schedule (under Syllabus).;To conduct your laboratory exercises, use the Laboratory Manual located under;Course Content. Read the introduction and the directions for each exercise/experiment;carefully before completing the exercises/experiments and answering the questions.;Save your Lab 1 Answer Sheet in the following format: LastName_Lab1 (e.g.;Smith_Lab1).;You should submit your document as a Word (.doc or.docx) or Rich Text Format;(.rtf) file for best compatibility.;eScience Labs, LLC 2014;Exercise 1: Data Interpretation;Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many living organism;requires oxygen to survive, it is a necessary component of water systems such as streams;lakes and rivers in order to support aquatic life. The dissolved oxygen is measured in units of;ppm (parts per million). Examine the data in Table 4 showing the amount of dissolved oxygen;present and the number of fish observed in the body of water the sample was taken from, finally;answer the questions below.;Post-Lab Questions;1. What patterns do you observe based on the information in Table 4?;2. Develop a hypothesis relating to the amount of dissolved oxygen measured in the water;sample and the number of fish observed in the body of water.;3. What would your experimental approach be to test this hypothesis?;4. What would be the independent and dependent variables?;5. What would be your control?;6. What type of graph would be appropriate for this data set? Why?;eScience Labs, LLC 2014;7. Graph the data from Table 4: Water Quality vs. Fish Population (found at the beginning of;this exercise).;8. Interpret the data from the graph made in Question 7.;Exercise 2: Experimental Variables;Determine the variables tested in the each of the following experiments. If applicable, determine;and identify any positive or negative controls.;Observations;1. A study is being done to test the effects of habitat space on the size of fish populations.;Different sized aquariums are set up with six goldfish in each one. Over a period of six;months, the fish are fed the same type and amount of food. The aquariums are equally;maintained and cleaned throughout the experiment. The temperature of the water is kept;constant. At the end of the experiment the number of surviving fish is surveyed.;A. Independent Variable;B. Dependent Variable;C. Controlled Variables/Constants;eScience Labs, LLC 2014;D. Experimental Controls/Control Groups;2. To determine if the type of agar affects bacterial growth, a scientist cultures E. coli on four;different types of agar. Five petri dishes are set up to collect results;One with nutrient agar and E. coli;One with mannitol-salt agar and E. coli;One with MacConkey agar and E. coli;One with LB agar and E. coli;One with nutrient agar but NO E. coli;All of the petri dishes received the same volume of agar, and were the same shape and size.;During the experiment, the temperature at which the petri dishes were stored, and at the air;quality remained the same. After one week the amount of bacterial growth was measured.;A. Independent Variable;B. Dependent Variable;C. Controlled Variables/Constants;eScience Labs, LLC 2014;D. Experimental Controls/Control Groups;Exercise 3: Testable Observations;Determine which of the following observations are testable. For those that are testable;Determine if the observation is qualitative or quantitative;Write a hypothesis and null hypothesis;What would be your experimental approach?;What are the dependent and independent variables?;What are your controls - both positive and negative?;How will you collect your data?;How will you present your data (charts, graphs, types)?;How will you analyze your data?;Observations;1. A plant grows three inches faster per day when placed on a window sill than it does;when placed on a on a coffee table in the middle of the living room.;eScience Labs, LLC 2014;2. The teller at the bank with brown hair and brown eyes is taller than the other tellers.;3. When Sally eats healthy foods and exercises regularly, her blood pressure is 10 points;lower than when she does not exercise and eats fatty foods.;eScience Labs, LLC 2014;4. The Italian restaurant across the street closes at 9 pm but the one two blocks away;closes at 10 pm.;5. For the past two days, the clouds have come out at 3 pm and it has started raining at;3:15 pm.;eScience Labs, LLC 2014;6. George did not sleep at all the night following the start of daylight savings.;Exercise 4: Conversion;For each of the following, convert each value into the;designated units.;1. 46,756,790 mg = _______ kg;2. 5.6 hours = ________ seconds;3. 13.5 cm = ________ inches;4. 47 C = _______ F;eScience Labs, LLC 2014;Exercise 5: Accuracy vs. Precision;For the following, determine whether the information is accurate, precise, both or neither.;1. During gym class, four students decided to see if they could beat the norm of 45 sit-ups;in a minute. The first student did 64 sit-ups, the second did 69, the third did 65, and the;fourth did 67.;2. The average score for the 5th grade math test is 89.5. The top 5th graders took the test;and scored 89, 93, 91 and 87.;3. Yesterday the temperature was 89 F, tomorrow its supposed to be 88 F and the next;day its supposed to be 90 F, even though the average for September is only 75 F;degrees!;4. Four friends decided to go out and play horseshoes. They;took a picture of their results shown to the right;5. A local grocery store was holding a contest to see who could most closely guess the;number of pennies that they had inside a large jar. The first six people guessed the numbers;735, 209, 390, 300, 1005 and 689. The grocery clerk said the jar actually contains 568;pennies.;eScience Labs, LLC 2014;Exercise 6: Significant Digits and Scientific Notation;Part 1: Determine the number of significant digits in each number and write out the specific;significant digits.;1. 405000;2. 0.0098;3. 39.999999;4. 13.00;5. 80,000,089;6. 55,430.00;7. 0.000033;eScience Labs, LLC 2014;8. 620.03080;Part 2: Write the numbers below in scientific notation, incorporating what you know about;significant digits.;1. 70,000,000,000;2. 0.000000048;3. 67,890,000;4. 70,500;5. 450,900,800;6. 0.009045;7. 0.023;eScience Labs, LLC 2014;Part 2;Show table or graph or pictures of your lab work.;Biology 102/103;Lab 2: The Chemistry of Life;INSTRUCTIONS;and submit it via the Assignments Folder by the date listed in the Course;Schedule (under Syllabus).;To conduct your laboratory exercises, use the Laboratory Manual located under;Course Content. Read the introduction and the directions for each exercise/experiment;carefully before completing the exercises/experiments and answering the questions.;Save your Lab 2 Answer Sheet in the following format: LastName_Lab2 (e.g.;Smith_Lab2).;You should submit your document as a Word (.doc or.docx) or Rich Text Format;(.rtf) file for best compatibility.;eScience Labs, LLC 2014;Pre-Lab Questions;1. Nitrogen fixation is a natural process by which inert or unreactive forms of nitrogen are;transformed into usable nitrogen. Why is this process important to life?;2. Given what you have learned about the hydrogen bonding shared between nucleic acids in;DNA, which pair is more stable under increasing heat: adenine and thymine, or cytosine and;guanine? Explain why.;3. Which of the following is not an organic molecule, Methane (CH 4), Fructose(C6H12O6);Rosane (C20H36), or Ammonia (NH3)? How do you know?;eScience Labs, LLC 2014;eScience Labs, LLC 2014;Experiment 1: Testing for Proteins;Data Tables and Post-Lab Assessment;Table 1: A Priori Predictions;Sample;Initial Color;Final Color;Is Protein Present?;Initial Color;Final Color;Is Protein Present?;1. Albumin;Solution;2. Gelatin;Solution;3. Glucose;4. Water;5. Unknown;Sample;1. Albumin;Solution;2. Gelatin;Solution;3. Glucose;4. Water;eScience Labs, LLC 2014;5. Unknown;Table 2: Testing for Proteins Results;Post-Lab Questions;1. Write a statement to explain the molecular composition of the unknown solution based on;the results obtained during testing with each reagent.;2. How did your a priori predictions from Table 1 compare to your actual results in Table 2? If;there were any inconsistencies, explain why this occurred.;eScience Labs, LLC 2014;3. Identify the positive and negative controls used in this experiment. Explain how each of;these controls are used, and why they are necessary to validate the experimental results.;4. Identify two regions which proteins are vital components in the human body. Why are they;important to these regions?;eScience Labs, LLC 2014;5. Diet and nutrition are closely linked to the study of biomolecules. Describe one method by;which you could monitor your food intake to ensure the cells in your body have the materials;necessary to function.;eScience Labs, LLC 2014;Experiment 2: Testing for Reducing Sugars;Data Tables and Post-Lab Assessment;Table 3: Testing for Reducing Sugars Results;Sample;Initial Color;Final Color;Reducing Sugar;Present;1 - Potato;2 - Onion;3 - Glucose Solution;4 - Water;5 - Unknown;Post-Lab Questions;1. What can you conclude about the molecular make-up of potatoes and onions based on the;test you performed? Why might these foods contain these substance(s)?;eScience Labs, LLC 2014;2. What results would you expect if you tested ribose, a monosaccharide, with Benedicts;solution? Biuret solution?;Experiment 3: What Household Substances are Acidic or;Basic?;Data Tables and Post-Lab Assessment;Table 4: pH Values of Common Household Substances;Substance;pH Prediction;pH Test Strip Color;Acetic Acid (Vinegar);eScience Labs, LLC 2014;Sodium Bicarbonate Solution;(Baking Soda);Post-Lab Questions;1. What is the purpose of determining the pH of the acetic acid and the sodium bicarbonate;solution before testing the other household substances?;2. Compare and contrast acids and bases in terms of their H+ ion and OH- ion concentrations.;eScience Labs, LLC 2014;3. Name two acids and two bases you often use.;eScience Labs, LLC 2014

 

Paper#15411 | Written in 18-Jul-2015

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