1What can you investigate using yeast?
factors affecting respiration
2What type of organism is yeast?
single-celled
3What does yeast respire both aerobically and anaerobically?
sugars
4What indicator shows aerobic respiration rate?
redox indicator dye
5What color does the dye change to?
colorless
6What is the first step in aerobic respiration experiments?
put yeast in a test tube
7What temperature should you set the water bath to?
40°C, 70°C, or 25°C
8What substance is added to start aerobic respiration?
glucose
9How do you measure the rate of respiration?
time for dye to turn colorless
10What does the mean rate of respiration equal?
1 ÷ mean time for color change
11What gas does yeast produce during anaerobic respiration?
carbon dioxide
12What apparatus is used for anaerobic respiration?
syringe or gas syringe
13What is used to exclude oxygen in anaerobic experiments?
liquid paraffin
14What is measured during anaerobic respiration experiments?
volume of CO₂ released
15What is a respirometer used to measure?
rate of oxygen consumption
16What solution absorbs CO₂ in respirometers?
potassium hydroxide
17What happens to the manometer fluid if oxygen is used?
moves toward the test tube
18What is the equation for the rate of respiration in respirometers?
volume of O₂ ÷ time
19What variables should be controlled in respiration experiments?
temperature, pH, substrate concentration
20What should be changed one at a time?
independent variable