WorksheetsBiol lab exam 1
Total questions: 61
Worksheet time: 41mins
What is the first step in the scientific method?
Form a hypothesis
Conduct an experiment
Make an observation
Analyze the results
Which of the following is a characteristic of a hypothesis?
Must be complex
Must be testable
Must be proven
Must be lengthy
In a controlled experiment, what is the role of the control treatment group?
To receive the experimental treatment
To serve as a baseline comparison
To manipulate the independent variable
To record the dependent variable
What is the independent variable in the termite experiment described?
The percentage of termites showing taxis
Different brands of black ink
The same trail shape and size
The response to the independent variable
What is the purpose of repeating an experiment and reporting the results?
To form a hypothesis
To ensure the results are consistent
To make an observation
To ask a question
What is the null hypothesis regarding termites exposed to black ink?
Termites exposed to black ink will show taxis
Termites exposed to black ink will not show taxis
Termites will be unaffected by any ink
Termites will show taxis to any color ink
Convert the number 5,462 into scientific notation.
5.462x103
54.62x102
0.5462 x 10^4
546.2 x 10^1
What is the first step in converting a decimal number to scientific notation?
Count the number of spaces the decimal moved
Write the coefficient to a value between 1 and 10
Indicate the direction the decimal moved
Keep all integers
Convert the number 0.007218 into scientific notation.
7.218 x 10^{-3}
0.7218 x 10^{-2}
72.18 x 10^{-4}
0.07218 x 10^{-1}
What does "non-polar" mean in terms of hydrophobicity?
Hydrophilic
Hydrophobic
Neutral
Amphipathic
What is the base unit for measuring mass in the metric system?
Meter
Gram
Liter
Celsius
Which metric prefix represents 1,000,000,000?
Mega
Kilo
Giga
Nano
How many milliliters are there in one liter?
100 mL
1,000 mL
10,000 mL
100,000 mL
What is the conversion factor from meters to nanometers?
103
106
109
1012
What color indicates a positive result when using Benedict's reagent?
Blue
Green
Purple
Pink
What is the formula for calculating density?
Density = mass + volume
Density = mass/volume
Density = volume/mass
Density = mass x volume
Which of the following substances has a pH of 7?
Sea water
Distilled water
Baking soda
Milk
What is the pH level of stomach acid?
1
3
5
7
How does KOH behave in water?
It forms a precipitate
It dissociates completely to give OH- ions
It remains undissolved
It forms a weak acid
What is the difference between accuracy and precision?
Accuracy is about closeness to the correct number, precision is about closeness of measurements to each other
Accuracy is about speed, precision is about accuracy
Accuracy is about precision, precision is about speed
Accuracy and precision are the same
Which of the following best describes a hydrophilic molecule?
It is amphipathic
It dissolves easily in water
It repels water
It is non-polar
Which variable is measured as the outcome in an experiment?
Control variable
Random variable
Dependent variable
Independent variable
What is the metric prefix for one thousandth (0.001)?
Micro
Milli
Kilo
Centi
Add 1 mL Lipid solution to 2 mL RO water
positive
negative
unknown
3 mL RO water (lipid)
positive
negative
unknown
1 mL unknown 2 mL RO water (lipid)
positive
negative
unknown
Add __ drops of _____ __ into each tube; mix gently (lipids)
(a)
The color and appearance when the lipid is (a) :
No layer and light pink throughout
The color and appearance when lipid is (a) :
Two layers with top layer dark red
5 drops of protein solution into
positive control tube
negative control tube
unknown control tube
Add 5 drops of RO water into the (protein)
positive
negative
unknown
Add 5 drops of the unknown solution into the (protein)
positive
negative
unknown
(protein) add _ drops of (a) to all tubes
Biuret's reagent appears ____ in the absence of proteins
blue
purple
Biuret's reagent appears ______ when it is reduced
blue
purple
5 drops glucose into
positive
neagtive
unknown
(glucose) 5 drops RO water into
positive
negative
unknown
(glucose) 5 drops of the unknown solution into
positive
negative
unknown
Add _ drops of (a) to each tube, record color of each solution immediately (before heating)
When heating the test tubes, remove them from the heat once the (a) changes color. Once it has changed color, remove all the tubes.
Add 5 drops of starch solution into the
positive
negative
unknown
(starch) add 5 drops of RO water into the
positive
negative
unknown
(starch) Add 5 drops of the unknown solution into the
positive
negative
unknown
(starch) Add _ drops of (a) to all tubes and mix gently
Your experiment requires that you have at least 0.85 g of NaOH. Inventory shows that you have 1500 mg of NaOH in stock. Do you have enough NaOH to complete the experiment? How much NaOH would you have?
(a)
A graduated cylinder measures out 80.6, 80.4, 80.1, and 80.5 mL when 100.0 mL was required. The measurements obtained are:
Precise and accurate
Not precise, accurate
Precise, inaccurate
Not precise, inaccurate
You weigh a 100 g object multiple times and receive the following data: 85.2, 101.5, 105.8, and 90.9 g. The measurements obtained are:
Precise and accurate
Not precise, accurate
Precise, inaccurate
Not precise, inaccurate
A pipette measures out 8.5, 8.9, 8.8, and 7.6 mL when 8 mL was required. The measurements obtained are:
precise and accurate
not precise and accure
precise and inaccurate
not precise and inaccurate
What is a meniscus and how should it be read?
Curved surface of a liquid
align the bottom of the curve with the nearest measurement line at eye level
read standing up with align the top of the curve with the nearest measurement line
What is 0.647 L in decimal notation?
(a)
What is the Scientific Notation for 0.647 L?
(a)
What is 28.3 g in decimal notation
(a)
what is 28.3 g in scientific notation
(a)
Convert 80.91 um into decimal notation
(a)
Convert 80.91 um into scientific notation
(a)
Convert 0.073 cm into Decimal notation
(a)
Convert 0.073 cm to Scientific Notation
(a)
Convert 4530 kg to Decimal Notation
(a)
Convert 4530 kg to Scientific Notation
(a)
Convert 0.55 nL to Decimal Notation
(a)
Convert 0.55 nL to Scientific Notation
(a)
