Question

Different types of cells are functionally isolated in which grade of organization.
a) Tissue level b) Cellular level
c) Organ level d) Organ-system level

Answer 1

Different types of cells are functionally isolated at the cellular level of organization. (Option b)

The cells are functionally isolated by the following layers;

Cell membrane (Plasma membrane)

• It is the barrier that separates the cell's interior from the external environment.
• It is a semi-permeable membrane.
• This membrane ensures that all the chemicals of the cell remain safely within it.
• They are made of lipids.

Cell wall

• It is the cell's layer just outside the cell membrane.
• Its main role is to protect the cell membrane and thus, it is situated very close to it.
• It also provides support and gives shape to the cell and its organelles.
• Animals lack a cell wall and this is the reason behind the irregular shape of their cell.