2011年2月17日 星期四

The differences between Prokaryotic and Eukaryotic cells


The differences between Prokaryotic and Eukaryotic cells

Prokaryotic cell is much smaller than Eukaryotic cell.
Eukaryotic cell-, where eu means true (true), karyon means nuclear, that is a complete nuclear envelope as the boundary of the nucleus
Prokaryotic cells -, where pro means before (before), which evolved before the complete nucleus. Its nucleus is not complete, that no nuclear membrane as the cytoplasm and the nucleus of the sub-boundaries.
Eukaryotic cells have a true nucleus but Prokaryotic cells have no nucleus.
DNA of prokaryotic cells with little protein but the organization of eukaryotic cells whose DNA contains a lot of complex structure of protein and both are used for the synthesis of ribosomal proteins are not the same size and composition.
Prokaryotic cells have a single strand of DNA, Eukaryotic cells are double-stranded DNA. Some of prokaryotic cells genetic information stored in the RNA, the genetic information of eukaryotic cells all stored in the DNA.






Eukaryotic Cell
  Prokaryotic Cell

Mitochondria
Present
Absent

Chloroplasts
Present (in plants)
Absent

Plasma membrane with steriod
Yes
Usually no

Flagella
Microscopic in size; membrane bound; usually arranged as nine doublets surrounding two singlets
Submicroscopic in size, composed of only one fiber

Lysosomes and peroxisomes
Present
Absent

Microtubules
Present
Absent or rare

Nucleolus
Present
Absent

Mitosis Occurs
Yes
No

Gentic Recombination
Meitosis and fusion gametes
Partial, undirectional transfers DNA

Number of chromozones
More than one
One

DNA complexed histones
Yes
No

True Membrane bound Nucluas
Present
Absent

Cell wall
Chemically simpler
Usually chemically complexed

Golgi apparatus
Present
Absent

Endoplasmi reticulum
Present
Absent

Differentation
Tissue and organs
Radimentary

Ribosomes
80S expecially in Mitchindia and chloroplast
70S

Cytoskeleton
Present
May be absent


From:
http://www.diffen.com/difference/Eukaryotic_Cell_vs_Prokaryotic_Cell




 

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