A) DNA without histone
B) nuclear membrane absent
C) 70S ribosome
D) all of the above
Correct Answer: D
Solution :
Blue-green algae (Cyanophyceae) shows prokaryotic cell organization which is characterised by the presence of DNA without histones (but some basic proteins present) 70S ribosomes, absence of nuclear membrane and membrane bound organelles. Many species like Nostoc, Anabaena contain heterocyst which is specialized for nitrogen fixation.
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