Cellular Respiration Experiment Procedures

Mr. Anderson guides viewers through a cellular respiration lab. The video covers the preparation of materials, including germinating peas, glass beads, and non-germinating peas, and the assembly of a respirometer. The experiment involves measuring respiration by observing changes in water levels in pipets, with precautions for handling potassium hydroxide. The video emphasizes the importance of maintaining consistent conditions and using glass beads as a control for environmental changes.

What is the first step in preparing for the cellular respiration lab?

• Fill a graduated cylinder with water

• Add germinating peas to a beaker

• Obtain three vials with steel washers

• Prepare paper towels

How many milliliters of germinating peas should be measured?

• 5 mL

• 10 mL

• 7 mL

• 15 mL

Why are glass beads used in the experiment?

• To absorb excess water

• To ensure equal volume and correct for temperature changes

• To act as a control for light exposure

• To provide nutrients for the peas

What is the purpose of potassium hydroxide in the respirometer?

• To act as a nutrient source

• To absorb carbon dioxide

• To provide oxygen

• To maintain temperature

What type of cotton is placed on top of the absorbent cotton in the respirometer?

• Absorbent cotton

• Non-absorbent polyester cotton

• Wool cotton

• Synthetic cotton

What is the main reason for sealing the respirometers tightly?

• To prevent water from entering

• To ensure accurate measurement of gas exchange

• To keep the peas from falling out

• To avoid breaking the glass

What is the purpose of the equilibration period in the experiment?

• To allow the peas to germinate

• To let the temperature inside the respirometers match the water temperature

• To ensure the potassium hydroxide is fully absorbed

• To allow the glass beads to settle

At what intervals should the measurements be recorded during the experiment?

• Every 15 minutes

• Every 10 minutes

• Every 5 minutes

• Every 2 minutes

What happens to the carbon dioxide produced during respiration in the experiment?

• It is absorbed by the peas

• It escapes into the air

• It is converted into oxygen

• It is captured by potassium hydroxide

Why is it important to measure the pipets before submerging them in water?

• To understand the scale for accurate measurement

• To check for any leaks

• To ensure they are clean

• To confirm they are the correct size