____ are characterised by their lack of well-defined nucleus and membrane bound organelles.

Bacteria

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Blue green algae

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Both of these

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None of these

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Solution

The correct option is A
Bacteria

All living cells can be divided into two groups - prokaryotes and eukaryotes. Prokaryotes are characterised by their lack of well-defined nucleus and membrane bound organelles. All bacteria such as E. coli, Salmonella typhi, etc. are prokaryotes. Amoeba has a well-defined nucleus. Therefore, it is an unicellular, eukaryotic organism.

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Similar questions

Which kingdom lacks a well-defined nucleus and membrane-bound cell organelles?

Which of the following is correct:

(a) Cells of all living organisms have a nucleus.

(b) Both animal and plant cells have a well defined cell wall.

(d) Cells are formed de novo from abiotic materials.

Name two cell-organelles that are double membrane bound. What are the

characteristics of these two organelles? State their functions and draw labelled

diagrams of both.

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