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LS23L Spring 2023 Final (compilation of the pre-lab and post-lab questions) Answered!!
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LS23L Spring 2023 Final (compilation of the pre-lab and post-lab questions) Answered!!
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LS23L Spring 202 3 Final (compilation of the pre-lab and post-lab questions ) Answered!!According to the syllabus, how many hours are you expected to spend on LS23L per
week?
Select one:
a. 8
b. 6
c. 9
d. 10 Answer- c. 9
What percentage of your grade is based on the final exam?
Select one:
a. 25%
b. 10%
c. 50%
d. 20% Answer- d. 20%
True or False: According to the syllabus, you are required to buy a textbook for the remote LS23L lab course.
Select one:
True False Answer- False
What is the conventional (most common) p-value used to signify statistical significance?
a. 0.01 (1%)
b. 0.09 (9%)
c. 0.05 (5%)
d. 0.1 (10%) Answer- c. 0.05 (5%)
A good statistical hypothesis is both specific and:
a. Correct
b. Informed
c. Testable
d. Persuasive Answer- c. Testable
The Experimental Design lab simulation introduces you to compound X, a compound
that may be harmful to kidney cells. What do you expect to happen to the cells that are exposed to compound X?
Select one:
a. Cells start multiplying b. Cells die
c. Cells differentiate
d. No effect Answer- b. Cells die
The Experimental Design lab module introduces you to compound X, a compound that may be harmful to kidney cells. What would the independent variable in your experiment be?
Select one:
a. Experimental control
b. Number of cells
c. Number of dead cells
d. Compound concentration Answer- d. Compound concentration
The Experimental Design lab module introduces you to compound X, a compound that may be harmful to kidney cells. Along with your experimental cells, you run a negative control. What would be your conclusion if most of the cells in the negative control died?
Select one:
a. Your experimental setup is flawed
b. The cells died as expected
c. No conclusion can be made
d. The negative control confirms the validity of the experiment Answer- a. Your experimental setup is flawed
What is a hypothesis?
a. Uncertain prediction
b. New theory
c. Testable explanation
d. Prediction statement Answer- c. Testable explanation
Why do we need to have experimental controls?
a. Ensure that changes in the dependent variable depend on the independent variable
b. Reduce variability in the results
c. Ensure that biological variability will not influence the results
d. Reduce the number of controlled variables to ensure the dependent variable is predictable Answer- a. Ensure that changes in the dependent variable depend on the independent variable
The maximum volume for a pipetter can be found on the pushbutton.
True
False Answer- True
What is the maximum volume you can safely and accurately pipet with a p1000 pipetter?
Select one:
a. 2 ul
b. 20 ul
c. 100 ul
d. 200 ul e. 1000 ul Answer- e. 1000 ul
1000 pg (picograms) is equal to how many ng (nanograms)?
Select one:
a. 0.1
b. 1
c. 10
d. 100
e. 1000 Answer- b. 1
Which of the following factors is mentioned as contributing to the spread of a disease?
Select one:
a. Cultural and social practices
b. Genetic background of a population
c. Infrastructure present in a nation
d. Natural environment of a region
e. All of these are factors Answer- e. All of these are factors
In epidemiology, a population that has never been exposed to a virus of interest and is not vaccinated for it is known as a(n)...
a. Fresh population
b. Healthy population
c. Naïve population
d. Immunocompromised population Answer- c. Naïve population
What part of the pipetter is indicated by the label "C" in the diagram below?
Select one:
a. A disposable tip
b. The volume adjustment ring
c. The shaft
d. The pushbutton
e. The ejector Answer- c. The shaft
The picture below shows the volumeter window for a p200 pipetter. What volume will
be pipetted with these settings? (0/2/5)
Select one:
a. 25 milliters (ml)
b. 25 microliters (ul)
c. 2.5 microliters (ul)
d. 2.5 milliliters (ml)
e. 0.25 millileters (ml) Answer- b. 25 microliters (ul)
How would you set the volume to pipette 20 µL with the P20?
Select one:
a. 2
b. 20
c. 2000
d. 200 Answer- d. 200
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