Posted: November 29th, 2017

UMUC Biology, First Assignment help

Question description

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.

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.
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:
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?
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, her blood pressure is 10 points lower than when she
eats unhealthy 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

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