Tuition Center Singapore Biology Tuition – Cell Structure and Organisation 

Common Error 1

Since cell walls are rigid, they should be impermeable.

Correct Concept 1

The rigidity of a structure is not indicative of its permeability. The rigidity of cell walls is useful in maintaining the turgidity of plants and preventing the bursting of the cell.

Common Error 2

Cells are the same as molecules

Correct Concept 2

Cells are not the same as molecules. In fact, cells (living) are made up of non-living molecules. The relative sizes of cells range from 1-100 pm (10^-6 m) while molecules are much smaller, in the range of picometers (10^– ‘²m) for those like water and in nanometers (10^-9m) for some like haemoglobin.

Common Error 3

Living things contain cells

Correct Concept 3

Living things are actually made up of cells

Please contact Mr Ong @ 9863 9633 or Angie @ 96790479 if you need help in O level Pure or combined Biology