why do prokaryotes does need membrane bound?

Answer 1

The answer is absolutely logical:every cell that exists needs a membrane because the plasma inside it(I don't know if it's correct:citoplasme),would spread ouside the cell,and the nucleotid(in case of the prokaryot,the most important part just because it contains the genetical information)would be lost.This way the cell would be dead and without any genetical information,it could not multiplicate.This is valide for absolutely any tipe of existing cell.

Answer 2

Do you mean "Why do prokaryotes NOT need membrane bound organelles?" These cells still need to carry on all kinds of processes and activities. Some processes happen in the cytoplasm, but those that need a membrane usually use the plasma membrane (outer cell membrane) for those processes. For instance, respiration usually uses the inner membrane of the mitochondrion, but prokaryotes use the plasma membrane for the same purpose.

Answer 3

Cell membrane is required for prokaroytes serve the same purpose of that of a eukaryote. The cell membrane regulates movement of molecules into the cell. If there is no regulation, things can go in and out at any time at any rate that they want. There must be some kind of a control mechanism.

Answer 4

Since your question makes no sense, try reading this...

Prokaryotes are very distinct from eukaryotes (meaning true kernel, also spelled "eucaryotes") because eukaryotes have true nuclei, while prokaryotes have nuclear material without being membrane bound. Eukaryotes are organisms that have cell nuclei and may be variously unicellular or multicellular. An example of an eukaryote would be a human. The difference between the structure of prokaryotes and eukaryotes is so great that it is considered to be the most important distinction among groups of organisms. Most prokaryotes are bacteria, and the two terms are often treated as synonyms. In 1977, Carl Woese proposed dividing prokaryotes into the Bacteria and Archaea (originally Eubacteria and Archaebacteria) because of the significant genetic differences between the two. This arrangement of Eukaryota (also called "Eukarya"), Bacteria, and Archaea is called the three-domain system replacing the traditional two-empire system.

The cell structure of prokaryotes differs greatly from eukaryotes in many ways. The defining characteristic is the absence of a nucleus or nuclear envelope. Prokaryotes also were previously considered to lack cytoskeletons and do lack membrane-bound cell compartments such as vacuoles, endoplasmic reticulum/endoplasmic reticula, mitochondria, Golgi apparatus, and chloroplasts. In eukaryotes, the latter two perform various metabolic processes and are believed to have been derived from endosymbiotic bacteria. In prokaryotes similar processes occur across the cell membrane; endosymbionts are extremely rare. Prokaryotes also have cell walls, while some eukaryotes, particularly animals, do not. Both eukaryotes and prokaryotes have structures called ribosomes, which produce protein. Prokaryotes are usually much smaller than eukaryotic cells.

Taking into account membrane bound organelles, prokaryotes also differ from eukaryotes in that they contain only a single loop of DNA stored in an area named the nucleoid. The DNA of the eukaryote is found on chromosomes. Prokaryotic DNA also lacks the proteins found in eukaryotic DNA. Prokaryotes have a larger surface area to volume ratio. This gives the Prokaryotes a higher metabolic rate, a higher growth rate and thus a smaller generation time as compared to the Eukaryotes.


[edit] Genes
Prokaryotes have a single circular (only exception is linear, as in Borrelia burgdorferi or the Streptomyces) chromosome, contained within a region called the nucleoid rather than in a membrane-bound nucleus, but may also have various small circular pieces of DNA called plasmids spread throughout the cell. Reproduction is most often asexual, through binary fission, where the chromosome is duplicated and attaches to the cell membrane, and then the cell divides in two. However, they show a variety of parasexual processes where DNA is transferred between cells, such as transformation and transduction.

Another difference is in the amount of junk DNA. Human genomes are described as having 95% or more of junk DNA while the figure is much smaller for prokaryotes (5-25%).


[edit] Colonies
While prokaryotes are nearly always unicellular, some are capable of forming groups of cells called colonies. Unlike many eukaryotic multicellular organisms, each member of the colony is undifferentiated and capable of free-living (but consider cyanobacteria, a very successful prokaryotic group which does exhibit definite cell differentiation). Individuals that make up such bacterial colonies most often still act independent of one another. Colonies are formed by organisms that remain attached following cell division, sometimes through the help of a secreted slimy layer.