Yeast were grown in tubes with different sugars. CO2 production was measured to compare fermentation rates after 30 minutes at 30 deg C.
Why does yeast produce less CO2 with starch than with glucose?
- A
Starch contains no carbon.
- B
Yeast prefer cooler conditions when fermenting starch.
- Ccheck_circle
Yeast lack the enzymes needed to digest starch into fermentable monosaccharides.
- D
Starch inhibits fermentation.
Explanation
Saccharomyces cerevisiae lacks amylases needed to hydrolyze starch, so the starch substrate is inaccessible to fermentation pathways.