UMUC Biology 102/103

    UMUC Biology 102/103Your Full Name:
    UMUC Biology 102/103
    Lab 1: Introduction to Science
    INSTRUCTIONS:
    • On your own and without assistance, complete this Lab 1 Answer Sheet
    electronically 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
    organisms 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). A researcher has found ten bodies of water with incrementally
    increasing dissolved oxygen and decides to use these to examine the effect dissolved oxygen
    has on a certain population of fish. She visits these sites multiple times and records the number
    of fish she observes each time. The data in Table 4 shows the amount of dissolved oxygen
    present and the average number of fish observed. Use this data to 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).
    ©eScience Labs, LLC 2014
    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. coli on four
    ©eScience Labs, LLC 2014
    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 (1-6) are testable. For those that are testable
    answer the following questions:
    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?
    ©eScience Labs, LLC 2014
    How will you present your data (charts, graphs, types)?
    How will you analyze your data?
    Observations
    1. A plant grows 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 a diet of healthy foods, her blood pressure is 10 points lower than when
    she eats a diet of fatty foods.
    4. The Italian restaurant across the street closes at 9 pm but the one two blocks away closes
    at 10 pm.
    ©eScience Labs, LLC 2014
    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. Don’t forget to use the correct
    number of significant digits!
    1. 46,756,790 mg = _______ kg
    2. 5.6 hours = ________ seconds
    3. 13.5 cm = ________ inches
    4. 47 °C = _______ °F
    ©eScience Labs, LLC 2014

                                                                                                                                                                   Order Now