The chemical reaction equation for respiration of glucose is:

C$6$H$12$O$6+6$O$26$ CO$2$

$+6$ H$2$O

Candida utilis cells convert glucose to CO$2$ and H$2$O during

growth. The cell composition is CH$1\mathrm{.}84$O$0\mathrm{.}55$N$0\mathrm{.}2$ plus $5\%$ ash. The

yield of biomass from substrate is $0\mathrm{.}5$ g$/$g$.$ Ammonia is used as

the nitrogen source.

a$)$ What is the oxygen demand with growth compared to that

without?

b$)$ C$.$ utilis is also able to grow with ethanol as substrate,

producing cells of the same composition as above. On a mass

basis, how does the maximum possible biomass yield from

ethanol compare with the maximum possible yield from

glucose?