BIO 181 LAB MIDTERM EXPERT VERIFIED ACTUAL
QUESTIONS & ANSWERS FOR GUARANTEED PASS
RECENT SOLUTION
Alka Setzer Lab procedure - ANSWER ✔ - 1. Once Alka Seltzer interacts with water it releases carbon
dioxide causing it to dissolve.
2. Dissolve half a tablet of Alka-Seltzer in cold, hot, and room temperature water
Alka Seltzer Lab variables - ANSWER ✔ - -Dependent variable: Time (seconds)
-Independent variable: Water Temperature (Celsius)
-Controls: Room temperature water and the half tab of Alka-Seltzer.
Alka Seltzer Hypothesis - ANSWER ✔ - As the water temperature increases, the time it takes to dissolve a
half tab of Alka-Seltzer will decrease because heat breaks down substances faster than any other
temperature.
Alka Seltzer Bar Graph - ANSWER ✔ - Y axis: Time
X axis: temperature
Which temperature caused the Alka-Seltzer to dissolve quickest? - ANSWER ✔ - Hot water
What is the relationship between temperature and speed at which Alka-Seltzer dissolves? - ANSWER ✔ -
The relationship between temperature and speed is the higher the temperature, the less time it takes
for Alka-Seltzer to dissolve.
Hypothesis - ANSWER ✔ - •A tentative explanation that can be tested scientifically
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, •Once proven by rigorous scientific investigation, hypothesis becomes a theory or a law
Why is it important to formulate a hypothesis? - ANSWER ✔ - scientists circle closer and closer to their
best estimation of the laws governing nature.
Scientific method steps - ANSWER ✔ - 1. Observation: a piece of the natural world
2. Question: What? Why? How?
3. Hypothesis: Testable, Reproducible & Falsifiable (STATEMENT!! Because)
4. Prediction: "If - Then" reasoning
5. Experimental & Observational Tests: Analyze results
6. Conclusion: What do the results mean?
What types of statements can be supported or rejected using the scientific method - ANSWER ✔ -
Difference between hypothesis and theory - ANSWER ✔ - When one person thinks of an idea, it is a
hypothesis. When the entire scientific community agrees on an idea, it is a theory.
Know the difference between hypothesis-based science and observation-based science - ANSWER ✔ -
observation based science is about describing nature, whereas hypothesis-driven science tries to explain
nature
Microscopy and Cell Staining Lab; how to calculate total magnification - ANSWER ✔ - 1. Line up the edge
of the ruler with the left edge of the FOV
2. Count the number of marks seen in the FOV. Mark is a mm.
3. Using Equation Diameter of high(er) power=Diameter (low power) × Magnification (low power divided
by Magnification at high(er) power, estimate the FOV with the 10X lens.
4. Calculate the diameter of the FOV for each magnification.
5. Divide the diameter of each magnification by 2—this is the radius of the FOV.
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QUESTIONS & ANSWERS FOR GUARANTEED PASS
RECENT SOLUTION
Alka Setzer Lab procedure - ANSWER ✔ - 1. Once Alka Seltzer interacts with water it releases carbon
dioxide causing it to dissolve.
2. Dissolve half a tablet of Alka-Seltzer in cold, hot, and room temperature water
Alka Seltzer Lab variables - ANSWER ✔ - -Dependent variable: Time (seconds)
-Independent variable: Water Temperature (Celsius)
-Controls: Room temperature water and the half tab of Alka-Seltzer.
Alka Seltzer Hypothesis - ANSWER ✔ - As the water temperature increases, the time it takes to dissolve a
half tab of Alka-Seltzer will decrease because heat breaks down substances faster than any other
temperature.
Alka Seltzer Bar Graph - ANSWER ✔ - Y axis: Time
X axis: temperature
Which temperature caused the Alka-Seltzer to dissolve quickest? - ANSWER ✔ - Hot water
What is the relationship between temperature and speed at which Alka-Seltzer dissolves? - ANSWER ✔ -
The relationship between temperature and speed is the higher the temperature, the less time it takes
for Alka-Seltzer to dissolve.
Hypothesis - ANSWER ✔ - •A tentative explanation that can be tested scientifically
Page 1 of 15
©™
, •Once proven by rigorous scientific investigation, hypothesis becomes a theory or a law
Why is it important to formulate a hypothesis? - ANSWER ✔ - scientists circle closer and closer to their
best estimation of the laws governing nature.
Scientific method steps - ANSWER ✔ - 1. Observation: a piece of the natural world
2. Question: What? Why? How?
3. Hypothesis: Testable, Reproducible & Falsifiable (STATEMENT!! Because)
4. Prediction: "If - Then" reasoning
5. Experimental & Observational Tests: Analyze results
6. Conclusion: What do the results mean?
What types of statements can be supported or rejected using the scientific method - ANSWER ✔ -
Difference between hypothesis and theory - ANSWER ✔ - When one person thinks of an idea, it is a
hypothesis. When the entire scientific community agrees on an idea, it is a theory.
Know the difference between hypothesis-based science and observation-based science - ANSWER ✔ -
observation based science is about describing nature, whereas hypothesis-driven science tries to explain
nature
Microscopy and Cell Staining Lab; how to calculate total magnification - ANSWER ✔ - 1. Line up the edge
of the ruler with the left edge of the FOV
2. Count the number of marks seen in the FOV. Mark is a mm.
3. Using Equation Diameter of high(er) power=Diameter (low power) × Magnification (low power divided
by Magnification at high(er) power, estimate the FOV with the 10X lens.
4. Calculate the diameter of the FOV for each magnification.
5. Divide the diameter of each magnification by 2—this is the radius of the FOV.
Page 2 of 15
©™
