[Biology] Nucleus

Nucleus serves as a centre for controlling all the activities of the cell

DISCOVERY:

  • Robert Brown in 1831 was the first individual to observe nucleus.
  • The discovery of nucleus was a revolutionary step which disregarded the concept of cell being an empty compartment bound by thick walls

PLACEMENT:

  • In animal cell, the nucleus occupies a central position.
  • In plant cell, the nucleus is pushed towards the periphery by the central vacuole.

NUCLEI PER CELL:

  • Generally, cells contain a single nucleus and are termed as mono-nucleate cells.
  • Cells containing two or more nuclei are termed as multi-nucleate cells.

VISIBILITY:

  • Nucleus is only visible under the microscope when cell is in non-dividing stage. It contains chromatin material and soluble sap called nucleoplasm.
  • In dividing cell, the nucleus disappears and the chromatin material in it is replaced by chromosomes.

This content is for members only!

JOIN NOW

0 Comments
Inline Feedbacks
View all comments