BIO 108 LAB MIDTERM EXAM
QUESTIONS AND ANSWERS GRADED A+
2026
Hypothesis - ANS Must be testable and falsifiable
Prediction - ANS Must come before experiment, if hypothesis then prediction. Can reject or
fail to reject, never "prove" or "confirm"
What are the variables? - ANS Independent, dependent, and controlled
What is a independent variable? - ANS variable being tested, the variable being manipulated.
What is a dependent variable? - ANS variable that is measured/counted
What is a controlled variable? - ANS variable that stays the same, consistent between groups,
not the control group
What are the groups? - ANS Experimental and Control
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
1
, What is the experimental group? - ANS the group that receives the NEW treatment
What is the control group? - ANS The group that does not receive the experimental
treatment in an experiment. Gets standard or no treatment.
Breakdown the hypothesis, prediction, variables, and groups of the butterfly experiment -
ANS Hypothesis: Infected female butterflies preferentially lay their eggs on anti-parasitic
milkweed
Prediction: Infected female butterflies will lay MORE eggs on the anti parasitic part (not all their
eggs), Uninfected will evenly lay their eggs
Variables:
-Control: Number of plants, time exposed, time of day, etc
- Dependent: Number of eggs (counted)
- Independent: Presence of infection (manipulated)
Groups:
- Experimental: Infected females
Control: Uninfected females
How many lenses does a compound microscope have? - ANS 2 or more
What are the objective lens'? - ANS low power, medium power, high power, and oil
immersion
What is the power of the low objective? - ANS 4x
What is the power of the medium objective? - ANS 10x
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
2
QUESTIONS AND ANSWERS GRADED A+
2026
Hypothesis - ANS Must be testable and falsifiable
Prediction - ANS Must come before experiment, if hypothesis then prediction. Can reject or
fail to reject, never "prove" or "confirm"
What are the variables? - ANS Independent, dependent, and controlled
What is a independent variable? - ANS variable being tested, the variable being manipulated.
What is a dependent variable? - ANS variable that is measured/counted
What is a controlled variable? - ANS variable that stays the same, consistent between groups,
not the control group
What are the groups? - ANS Experimental and Control
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
1
, What is the experimental group? - ANS the group that receives the NEW treatment
What is the control group? - ANS The group that does not receive the experimental
treatment in an experiment. Gets standard or no treatment.
Breakdown the hypothesis, prediction, variables, and groups of the butterfly experiment -
ANS Hypothesis: Infected female butterflies preferentially lay their eggs on anti-parasitic
milkweed
Prediction: Infected female butterflies will lay MORE eggs on the anti parasitic part (not all their
eggs), Uninfected will evenly lay their eggs
Variables:
-Control: Number of plants, time exposed, time of day, etc
- Dependent: Number of eggs (counted)
- Independent: Presence of infection (manipulated)
Groups:
- Experimental: Infected females
Control: Uninfected females
How many lenses does a compound microscope have? - ANS 2 or more
What are the objective lens'? - ANS low power, medium power, high power, and oil
immersion
What is the power of the low objective? - ANS 4x
What is the power of the medium objective? - ANS 10x
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
2
