Membrane is absent in
Nucleus
Nucleolus
Vacuole
Lysosome
B.
Nucleolus
Nucleolus is a darkly stained granular, naked organelle with no limiting membrane. It is formed of proteinaceous part pars amorpha, fibrillar zone and granular zone of ribonucleoprotein and granules.
In prokaryotes, chromatophores are
Specialised granules responsible for the colouration of cells
Structures responsible for organising the shape of the organism
Inclusion bodies lying free inside the cells for carrying out various metabolic activities
Internal membrane systems that may become extensive and complex in photosynthetic bacteria
Who for the first time developed electron microscope?
Knoll and Ruska
Rudolf and Kolliker
Robert Hooke
Swanson