Question

Bacteria and yeast are similar in all the following features except that
A. Both are unicellular
B. Both are prokaryotes
C. Both are capable of causing fermentation
D. Both produce spores

Answer 1

Hint:- According to the five kingdom classification bacteria are classified under the prokaryotes and yeast comes under eukaryotes. The classification is based on the fact that eukaryotic cells have a true nucleus containing their DNA, whereas prokaryotic cells do not have a nucleus.

Complete answer:
As we know , from the above discussion that bacteria comes under prokaryotes whereas the yeast comes under eukaryotes. The yeast basically belongs to the kingdom fungi (being the only exception as it is unicellular). All the bacteria are also unicellular.
Both bacteria as well as yeast are capable of causing fermentation. Due to this property many food industries use yeast to fermentation. In animal cells when oxygen supply is not sufficient or due to vigorous exercise the bacteria in the cells produce lactic acid in the muscle , this is also the fermentation process.
Bacteria and yeast both produce spores in unfavorable conditions or for reproduction.

Additional Information: Many types of yeasts are used for making many foods: baker’s yeast in bread production, brewer's yeast in beer fermentation, and yeast in wine fermentation and for xylitol production. Fermentation bacteria are anaerobic, but use organic molecules as their final electron acceptor to produce fermentation end-products. Streptococcus, Lactobacillus, and Bacillus, for example, produce lactic acid, while Escherichia and Salmonella produce ethanol, lactic acid, succinic acid, acetic acid, Carbon dioxide and hydrogen.

Hence, the correct option is (B) Both are prokaryotes.

Note:- Although both are unicellular but yeast have a well defined or true nucleus. Bacteria produces spores in unfavorable conditions for survival where as yeast produces it as a mode of asexual reproduction, but both of them produce spore irrespective of their function.