BIO 181 Lab Midterm Grand Canyon University Updated 2025/26 RATED A+

BIO 181 Lab Midterm Grand Canyon
University Updated 2025/26 RATED A+
What is a hypothesis? - Correct Answers - A tentative explanation thetas given and can be tested.
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- Predictions that can be tested by conducting observations or by performing experiments.
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II! What is a null hypothesis? - Correct Answers - Is a default assumption that an explanation or prediction
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II! is false.
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II! What is an alternative hypothesis? - Correct Answers - Is the alternative explanation to the null
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II! hypothesis thetas accepted as a best explanation if the null hypothesis is rejected. II! II! II! II! II! II! II! II! II! II! II! II!




II! What is a dependent variable? - Correct Answers - The elements measured or counted by an
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II! investigator in response to a change in an experiment as a result of a change in the independent variable.
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II! What is an independent variable? - Correct Answers - The variable that drives/manipulates a change in
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II! the dependent variable. the investigator assumes that experimental outcomes can be predicted and even
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II! changed by changing/manipulating an independent variable. II! II! II! II! II!




II! What is an experimental group? - Correct Answers - The section of the experiment involving
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II! manipulation of an independent variable. II! II! II! II!




II! What is the control group? - Correct Answers - The section of the experiment in which an independent
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II! variable is omitted or set a standard value. The control group helps to evaluate how the manipulation of
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II! the independent variable affects the outcome of the experiment.
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II! Why is it important to formulate a hypothesis? - Correct Answers - It involves suggesting possible
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II! answers to proposed scientific questions in a predictive and explanatory form.
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II! What are the five steps in the scientific method? - Correct Answers 1) Making observations
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2) Formulating a hypothesis
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3) designing an experiment to test the hypothesis
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, 4) Presenting and analyzing results
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5) Interpreting and communicating results.
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II! What is the formula to find the % change in weight? - Correct Answers Final weight - Initial weight/
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II! initial weight X 100II! II! II!




II! How do you calculate total magnification? - Correct Answers diameter of high(er) power=Diameter
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II! (lower power) X magnification(low power)/Magnification at higher power
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II! How do you estimate size of an organism? - Correct Answers Object size=% occupied by object in the
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II! FOV X diameter of the FOV
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II! What is the revolving nosepiece? - Correct Answers Changes objective lenses
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II! What is the objective lens? - Correct Answers It magnifies specimen
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II! What is the diaphragm = condenser? - Correct Answers it controls the amount of light that reaches
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II! specimen



II! What is the light source? - Correct Answers It allows the specimen to be seen
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II! What is the ocular lens (eyepiece)? - Correct Answers Lens you look through
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II! What is the coarse-adjustment knob? - Correct Answers Used to focus the image of specimen
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II! What is the Fine adjustment knob? - Correct Answers Bring the image of specimen into sharp focus
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II! What is the stage? - Correct Answers Supports microscope slide
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II! What are the stage clips? - Correct Answers Hold the specimen into place.
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