Which one of the following statements are correct?

(i) In some prokaryotes, glycocalyx could be loose sheath called slime layer and sometime it may be thin and tough called capsule.

(ii) In bacteria, cell wall determines the shape of cell and provides structural support.

(iii) In cyanobacteria, the membranous extensions into cytoplasm called chromatophores contains pigments.

(iv) Motile bacteria have thick filamentous extension from their cell wall called flagella, which is composed of three parts filament, hook and basal body. Filament is the lingest portion and extend from cell surface to the outside.

(v) Surface structure present in bacteria are flagella, pili and fimbriae.

(vi) Ribosome are about 15-20 nm size and are made up of two subunits- 50S and 30S, which form 70S prokaryotic ribosome.

(vii) Several ribosome may attach to a single rRNA and form a chain called polyribosomes (or) polysome.

(viii) Reserve material in prokaryotic cells are stored in cytoplasm in the form of inclusion bodies.

(ix) The cell membrane is composed of lipids that are arranged in a bilayer.

(x) In humans, the membrane of the erythrocyte has approximately 52% lipids and 40% proteins.

(xi) According to fluid mosaic model, the quasi-fluid nature of lipid enables lateral movement of protein within the overall bilayer. This model was given by singer and Nicolson in 1971.

(xii) Movement of water by diffusion across plasma membrane is called osmosis.