Briefly describe the cell structure of blue-green algae.

1.	Briefly describe the cell structure of blue-green algae.
Answer» (i) Cyanobacteria or blue-green algae are gram(+) photosynthetic prokaryotes which perform oxygenic photosynthesis (ii) Cell structure is typically prokaryotic-one envelope organisation with peptidoglycan wall naked DNA, 70S ribosomes, devoid of membrane bound cell organelles. (iii) The outer part of the protoplast contains a number of photosynthetic thylakoids. It is called as chromoplasm. (iv) Their membranes contain chlorophyll a, carotenes and xanthophylls. Chlorophyll b is absent. (v) DNA lies coiled generally in central part of the cytoplasm known as centroplasm. (vi) Small circular DNA segments may also occur in nucleoid, known as plasmid or transposons.

Answer»

(i) Cyanobacteria or blue-green algae are gram(+) photosynthetic prokaryotes which perform oxygenic photosynthesis

(ii) Cell structure is typically prokaryotic-one envelope organisation with peptidoglycan wall naked DNA, 70S ribosomes, devoid of membrane bound cell organelles.

(iii) The outer part of the protoplast contains a number of photosynthetic thylakoids. It is called as chromoplasm.

(iv) Their membranes contain chlorophyll a, carotenes and xanthophylls. Chlorophyll b is absent.

(v) DNA lies coiled generally in central part of the cytoplasm known as centroplasm.

(vi) Small circular DNA segments may also occur in nucleoid, known as plasmid or transposons.

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