Q. Beer and butter milk are products of fermentation by

A) Rhizopus stolonifer
B) Caedobacter taeniospiralis
C) Bacillus subtilis
D) Saccharomyces cerevisiae
Explanation

Saccharomyces cerevisiae is a species of budding yeast. It is commonly known as ‘baker’s yeast’ or ‘brewer’s yeast’. The yeast ferments sugars present in the flour or added to the dough, giving off carbon dioxide ($CO_{2}$) and alcohol (ethanol). The carbon dioxide is trapped as tiny bubbles in the dough, which rises.

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.