a. they can't fix atmosphere nitrogen
b. they form a symbiotic relationship with fungi
c. they cause disease
d. they do not have a nucleus
2007-03-05 00:23:16 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Biology
d. they do not have nucleus
Cyanobacteria are prokaryotic organisms, i.e. they lack nuclei. Most of the genetic material is located in the cytoplasm as a single DNA molecule, which is attached to the membrane. There are also smaller molecules, called plasmids, situated again in the cytoplasm. All eukaryotic cells have membrane bound nuclei.
2007-03-05 00:26:23 · answer #1 · answered by Anonymous · 1⤊ 0⤋
d. They do not have a nucleus.
They are prokaryotes and hence have only an incipient nucleus.
2007-03-05 09:01:26 · answer #2 · answered by Tauba 2 · 0⤊ 0⤋
they don't have a nucleus
Prokaryotes are characterised by their under-developed of absent nuclei, apart from other things
2007-03-05 08:45:21 · answer #3 · answered by Malfoy vs Potter 5 · 0⤊ 0⤋
d.
2007-03-05 08:29:15 · answer #4 · answered by Anonymous · 0⤊ 0⤋