Question

You identify a new species of microorganism in an undersea thermal vent. The microbe is a single cell organism that lacks a nucleus. Which Domain would you classify your new species as belonging to?

domain archae

none

domain bacteria

domain eukarya

Answer 1

Answer : domain archae

According to Carl Woese their are 3 domains of life -

1) Domain bacteria :

• They are unicellular,colonial or filamaentous,prokaryotic organisms with no nuclear membrane.
• They lack a well defined nucleus,nucleolus is absent.
• Membrane bound organelles are absent.
• They contain 70 S Ribosome.
• Cell wall is made up of peptidoglycan called murein.
• They live in normal habitats.

2) Domain archae :

• These are actually a type of bacteria.
• These are special since they live in some harsh habitats such as hot undersea thermal vents,extreme salty areas, marshy areas and highly acidic areas.
• Cell wall is made up of peptidoglycan called pseudomurein.
• They also lack a well defined nucleus i.e. they are prokaryotes.

3) Domain eukarya :

• They are unicellular ,colonial or multicellular,Eukaryotic organisms.
• These organisms may or may not have cell wall.
• They have a well defined nucleus.
• They contain 80 S Ribosome ,in addition to 70 S in Mitochondria and Chlorophyll.
• Membrane bound organelles are present.

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