Question

During anaerobic respiration in yeast :

• A. $H _{2} O$ and $CO _{2}$ are end products
• B. $CO _{2}$, ethanol and energy are end products
• C. $CO _{2}$ and $H _{2} O$ are end products
• D. $ CO_{2} $ , acetic acid and energy are end products

Answer 1

Answer: (B)

When oxygen is not available, yeast or some other microbes respire anaerobically. In case of anaerobic respiration the value of respiratory quotient is much more than unity as oxygen is not utilized, e.g.,
$\underset{\text { Glucose }}{ C _{6} H _{12} O _{6}} \xrightarrow[{\text{ethylalcohol}}]{\text { zymase }} \underset{\text{ethylalcohol}}{3 C _{2} H _{5} OH} +2 CO _{2}+$ energy
$RQ =\frac{2 CO _{2}}{ O _{2}}=2$ or $\alpha$