The undefined nuclear region of prokaryotes is also known as:

Lysosomes arise from:

Name the scientist who discovered cells. List any two single-celled (unicellular) organisms.

List two types of plastids. State one function of each.

Identify and name the following cell structures.
$(a)$ The undefined nuclear region of a prokaryotic cell.
$(b)$ The site of energy release inside the cell.

$(a)$ What are the consequences of the following conditions?
$(i)$ $A$ cell having higher water concentration than the surrounding medium.
$(ii)$ $A$ cell having lower water concentration than the surrounding medium.
$(iii)$ $A$ cell having equal water concentration to its surrounding medium.
$(b)$ Name the materials of which the cell membrane and cell wall are composed.