anactualmess
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"Yeast can also respire aerobically. The student repeated the investigation with a fresh sample of yeast in glucose solution, but without the oil. All other conditions remained the same.
Explain what would happen to the volume of gas in the syringe if the yeast were only respiring aerobically."

The answer is :
1. (Stays the) same/level/(relatively) constant;
2. Same volume/amount of oxygen uptake and carbon dioxide release;

Why is this?
And how can the volume of oxygen uptake remain the same if anaerobic respiration does not take up oxygen at all?
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sana_a
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is there another part to the question?
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anactualmess
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(Original post by sana_a)
is there another part to the question?
A student investigated the rate of anaerobic respiration in yeast. She put 5 g of yeast into a glucose solution and placed this mixture in the apparatus shown in Figure 4. She then recorded the total volume of gas collected every 10 minutes for 1 hour.

I don't know how to attach the image of figure 4 but basically it's a flask with yeast in glucose solution, with a layer of oil on top, and then a gas syringe attached to the flask.
Last edited by anactualmess; 2 years ago
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username3249896
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(Original post by anactualmess)
only respiring aerobically."

The answer is :
1. (Stays the) same/level/(relatively) constant;
2. Same volume/amount of oxygen uptake and carbon dioxide release;

Why is this?
And how can the volume of oxygen uptake remain the same if anaerobic respiration does not take up oxygen at all?
Question asks if they were respiring aerobically only.
C6H12O6+6O2->6H2O+6CO2
The volume will stay the same as the same amount of CO2 is given out as O2 is taken in

If they were respiring anaerobically, then the volume would increase as CO2 is given out. No gas is taken in.
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