TYPES OF CELLS
TYPES OF CELLS
➡️There are two types of cells
(on the basis of structural form )
I) Prokaryotic Cells
II) Eukaryotic Cells
I) Prokaryotic cells
➡️It is primitive(साधारण) and incomplete cells.
➡️It is small in size (1 - 10mm).
➡️Nucleus is absent.
➡️Nuclear region or nucleiod is not surrounded by a nuclear membrane.
➡️It has single chromosome*.
➡️Nucleolus* is absent.
➡️Membrane bound cell organelles are absent.
➡️Cell division takes place by fission or budding (no mitosis).
➡️It consists of a single membrane -
a. The plasma membrane or
Cell membrane
➡️It is Unicellular organisms.
➡️DNA* is not associated (रिश्तेदार/जुड़ा हुआ ) with protein.
Note point :-
➡️*Nucleoid - The undefined nuclear region in cytoplasm is called nucleoid().
➡️DNA- Deoxyribonucleic acid
➡️A polymeric nucleic acid.
➡️RNA - Ribonucleic acid ; polymeric nucleic acid.
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| Fig. No-1 |
II) Eukaryotic Cells
➡️Eukaryotic (Eu= good or well ;karyon=nucleus)
➡️It is large in size(5 - 100 micrometer).
➡️It is a advanced and complete cell.
➡️This type of cells are found unicellular and multicellular plants and animals.
(except bacteria and blue - green algae)
➡️It has a defined nuclear membrane surrounding the genetic material.
➡️Its DNA is bounded with protein.
➡️Nucleas is present.
➡️It has more than one chromosome.
➡️Nucleous is present.
➡️In it, mitochondria, plastids, endoplasmic reticulum, Golgi aparatus, lysosomes, peroxisomes, etc. are present.
➡️Cell division occurs by mitotic or meiotic cell division.
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