There are two kinds of cell on the basis of Nuclear Structure :
Ø Prokaryotie cell : Nucleus is not well
organized in these cells;nuclear membrane and nucleolus are absent here. In
these cells Chromosomecontains only DNA. Generally no other organelles are
present except Ribosome. Cell division happens here through Amitosis process.
Ø Eukaryotic cell: There
are well-organised nucleus in these cells with membrane and nucleolus.
Chromosome contains DNA, proteins Chloroplasts, Mitochondria and other
organelles. Cell division happens throughmitosis process.
There are two kinds of cell on the basis of Function:
Ø Somatic cell : These cells construct the
living body but do not take part in reproduction. In the lower group of living
objects they are haploid i.e. only one set of chromosomes are present, but in
higher groups they are diploid i.e. there are two sets of chromosome in the
nucleus.
Ø Reproductive cell: These cells take part in
sexual reproduction but do not construct the main body. These cells are also
haploid. Sperm and ovum are examples of reproductive cell.
Size, shape and Structure of Living cell: It is
normal to have some diversity in size, shape and structure of cells. The size,
shape and structure of a eukaryotic cell (eucell) are described below in brief.
Ø Size : A cell
may be 0.1 ì (micron)
to 55cm (centimeter) or even more.[1 Millimeter = 1000 Micron]
Ø Shape: Cells are of different
shapes. Mainly they are spherical, oval, rectangular, barrel shaped or
polygonal.
Ø Structure of typical cell :Structurally cells are of
various types. For that in a certain cell all the organelles or structural
ingredients may not be present. For that reason, considering the presence of
all the organelles in a certain cell, it may be termed as a Generalized Cell. A
generalized cell has mainly two parts- Cell wall and protoplasm.
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