Umuc biology 102/103 lab 1: introduction to science answer key


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Exercise 1: Postulates Interpretation  (2 pts each)

1. What patterns do you note inveterate on the counsel in Consideration 4?

No fish are introduce when the dissolved oxygen is cipher. When there is over dissolved oxygen in the impart, over fish are introduce. However, the compute of fish tends to ooze or smooth off when the dissolved oxygen is excellent than 12 ppm.

 

2. Develop a supposition touching to the sum of dissolved oxygen measured in the impart case and the compute of fish noted in the association of impart.

Possible Hypotheses:

1.    The sum of dissolved oxygen affects the compute of fish that can speed in a association of impart.

2.    As dissolved oxygen attention increases, over fish can speed in the association of impart.

3.    There is an imaginary dissolved oxygen attention for fish to speed in.

 

The peace of the questions are answered in bountiful version:

1.    What would your trialal appropinquation be to ordeal this supposition?

 

 

2.    What would be the fractions and subject variables?

 

 

3.    What would be your restrain?

 

 

4.    What emblem of graph would be delayhold for this postulates set?  Why?

 

 

5.    Graph the postulates from Consideration 4: Impart Tendency vs. Fish Population (fix at the prelude of this employment).

 

 

6.    Interpret the postulates from the graph made in Question 7.

 

 

 

Exercise 2: Tentative Variables

Determine the variables ordealed in the each of the aftercited trials. If conducive, mention and warrant any actual or indirect restrains.

  

Observations

1.    A consider is entity manufactured to ordeal the goods of habitat capability on the greatness of fish populations. Irrelative greatnessd aquariums are set up delay six goldfish in each one. Over a epoch of six months, the fish are fed the selfselfcorresponding emblem and sum of stay. The aquariums are equal maintained and cleaned throughout the trial. The air of the impart is kept steady. At the end of the trial the compute of surviving fish is surveyed.

A.    Insubject Variable:

 

 

B.    Dependent Variable:

 

 

C.   Controlled Variables/Constants:

 

 

D.   Experimental Controls/Control Groups:

 

 

2.    To mention if the emblem of agar affects bacterial enlargement, a savant cultures E. coli on impure irrelative emblems of agar. Five petri dishes are set up to garner results:

§  One delay nutrient agar and E. coli

§  One delay mannitol-salt agar and E. coli

 

§  One delay MacConkey agar and E. coli

§  One delay LB agar and E. coli

§  One delay nutrient agar but NO E. coli

 

All of the petri dishes current the selfselfcorresponding work of agar, and were the selfselfcorresponding fashion and greatness. During the trial, the air at which the petri dishes were abundanced, and at the air tendency remained the selfsame. After one week the sum of bacterial enlargement was measured.

A.    Insubject Variable:

 

 

B.    Dependent Variable:

 

C.   Controlled Variables/Constants:

 

 

D. Experimental Controls/Control Groups:

Exercise 3: Tesconsideration Observations

Determine which of the aftercited notices are ordealable. For those that are ordealable:

Determine if the notice is accidental or quantitative

Write a supposition and null supposition

What would be your trialal appropinquation?

What are the subject and fractions variables?

What are your restrains - twain actual and indirect?

How obtain you garner your postulates?

How obtain you introduce your postulates (charts, graphs, emblems)?

How obtain you dissect your postulates?

 

Observations

1.    A settle grows three inches faster per day when placed on a window sill than it does when placed on a on a coffee consideration in the middle of the stay capability.

 

 

2.    The teller at the bank delay brown hair and brown eyes is taller than the other tellers.

 

 

 

3.    When Sally eats hearty stays and employments constantly, her rank exigency is 10 points inferior than when she does not employment and eats fatty stays.

 

 

 

4.    The Italian peaceaurant resisting the street closes at 9 pm but the one two blocks abroad closes at 10 pm.

 

 

5.    For the late two days, the clouds enjoy end out at 3 pm and it has launched raining at 3:15 pm.

 

 

 

6.    George did not slumber at all the ignorance aftercited the initiate of daylight savings.

 

 

 

Exercise 4: Conversion

For each of the aftercited, change each compute 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 aftercited, mention whether the counsel is accurate, correct, twain or neither.

 

1.    During gym tabulate, impure wards unwavering to see if they could defeat the law of 45 sit-ups in a diminutive. The earliest ward did 64 sit-ups, the second did 69, the third did 65, and the impureth did 67.

 

 

2.    The middle score for the 5th gait math ordeal is 89.5. The top 5th gaitrs took the ordeal and scored 89, 93, 91 and 87.

 

3.    Yesterday the air was 89 °F, tomorrow it’s deemed to be 88 °F and the proximate day it’s deemed to be 90 °F, level though the middle for September is merely 75 °F degrees!

 

4.    Four friends unwavering to go out and play horseshoes. They took a paint of their results shown to the right:

 

 

 

 

5.    A national grocery abundance was calling a conordeal to see who could most closely suspect the compute of pennies that they had internally a vast jar. The earliest six vulgar suspected the computes 735, 209, 390, 300, 1005 and 689. The grocery clerk said the jar really contains 568 pennies. 

 

 

Exercise 6: Suggestive Digits and Philosophical Notation

Part 1: Mention the compute of suggestive digits in each compute and transcribe out the specific suggestive 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: Transcribe the computes adown in philosophical notation, incorporating what you apprehend about suggestive 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