anaerobic respiration in yeast

Question 1

a way to investigate anaerobic respiration is to

Answer 1

study the production of carbon dioxide under diff conditions

Question 2

if you bubble carbon dioxide through limewater

Answer 2

it turns cloudy white (milky)

Question 3

in the presence if carbon dioxide the hydrogen carbonate indicator changes

Answer 3

from yellow to purple

yellow = high CO2
purple = low CO2

Question 4

describe a practical for studying production of carbon dioxide

Answer 4

get 2 boiling tubes
dissolve sugar in boiled water
add yeast and mix to form suspension
pour into test tube 1
add vegetable oil into tube 1
connect delivery tube to boiling tube 2
tube 2 contains limewater or hydrogen carbonate indicator

the veggie oil prevents oxygen - no aerobic respiration only anaerobic

the conditions that can be investigated include:
temperature, concentration of sugar & type of sugar