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UMUC BIOL103 lab 1




Question;UMUC;Biology 102/103;Lab 1;Introduction to Science;INSTRUCTIONS;?;On your own and without assistance, complete;thisLab;1AnswerSheet electronically;and submit it via theAssignments;Folder by the date listedintheCourse Schedule (underSyllabus).;?;To conduct your laboratory exercises, use the;Laboratory Manuallocated 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 1AnswerSheet in the;following format: LastName_Lab1 (e.g.;Smith_Lab1).;?;You should submit your documentas a Word (.doc or.docx) or Rich;Text Format (.rtf) file for best compatibility.;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?;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;D. Experimental;Controls/Control Groups;2. To;determine if the type of agar affects bacterial growth, a scientist cultures E.;colion 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;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.;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.;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.;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;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 it?s supposed to be 88 ?F and the next day;it?s 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.;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;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


Paper#62809 | Written in 18-Jul-2015

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