Which of the following organisms have cell membrane but never have cell wall?
Cyanobacteria
Virus
Mycoplasma
Eubacteria
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.
(c) In prokaryotes, there are no membrane bound organelles.
(d) Cells are formed de novo from abiotic materials.