Question

Fission yeast are
A) Archaebacteria
B) Eubacteria
C) Prokaryotes
D) Eukaryotes

Answer 1

Yeasts are organisms that belong to the kingdom Fungi. Unlike prokaryotes, they have a well-defined nucleus that holds the genetic material.

Complete answer:
After the introduction of the six kingdom classification or three-domain system of classification by Carl Woose, the kingdom monera was divided into two domains and remaining other groups (Protista, Fungi, Plantae and Animalia) were placed in one domain called Eukarya. Therefore, yeasts were classified under eukaryotes since their genetic material was present inside the nucleus. Yeasts are used as a model organism to study various cellular processes. Carl Woose classified the monera into two domains on the basis of 16s rRNA.

1. Archea: They are considered as one of the primitive prokaryotes. They generally differ from bacteria. They can survive in extreme environmental conditions and they lack peptidoglycan layers in their cell wall. Examples of extremophiles:
   a) Halophiles: Live in high saline environment like
   b) Thermophiles: They live in an extremely hot environment.
   c) Acidophiles: They live in an acidic environment.
   d) Methanogens: They live under anaerobic condition and produce methane gas which is used to produce bioenergy.
2. Eubacteria: They are also prokaryotes, a single-cell organism, containing no cell organelles. They contain peptidoglycan layers in their cell wall. Example: Cyanobacteria.
   Hence, the correct answer is option C.

Note: Archaebacteria is also known as a living fossil because they remained unchanged over geological periods. Yeasts are also used in baking industries to carry out the process of fermentation.