what is prokaryotes.?

Answer 1

a prokaryote is a bacteria and other types of early cells. This type of cell has no nucleus.

Answer 2

A prokaryote is a simple one celled life form that does not have a true nucleus. The nucleus of a cell is a separate, membrane bound structure with the genetic instructions (DNA) on the inside, along with all the material involved in processing the DNA and "expressing" it. Life-forms with nuclei, either one celled or multi-celled are termed EUKARYOTES. Those that do not have nuclei are termed PROKARYOTES. Prokaryotes are much smaller than eukaryotes and have much simpler biochemistry. Bacteria are prokaryotes and are only about 1 to 5 microns in size. Most one celled eukaryotes are at least 10 times larger than that.

Answer 3

Based on the complexity of organisation the cells are categorised into two types:prokaryotic and eukaryotic cells. prokaryotic cells lack a nuclear membrane. Nuclear material consist a single chromosome which is directly in contact with cytoplasm. other membrane bound organelles are also absent. The prokaryotes include bacteria and cyanobacteria..it use to be called as 'blue-green algae......I explained the answer.

Answer 4

pro·kar·y·ote also pro·car·y·ote audio (pr-kr-t) KEY

NOUN:

An organism of the kingdom Monera (or Prokaryotae), comprising the bacteria and cyanobacteria, characterized by the absence of a distinct, membrane-bound nucleus or membrane-bound organelles, and by DNA that is not organized into chromosomes. Also called moneran .

ETYMOLOGY:

French procaryote : Greek pro-, before ; see pro- 2 + Greek karutos, having nuts (from karuon, nut; see karyo- )

OTHER FORMS:
pro·kary·otic (-tk) KEY (Adjective)




The Basic Structure Of A Prokaryote
Prokaryotes are the single-celled organisms, such as bacteria, and are roughly one micrometer in diameter. Unlike Eukoryotes, prokaryotes do not have a nucleus that houses its genetic material. Rather, the genetic material of a prokaryote cell consists of a large DNA molecule compacted in an area of cytoplasm called the nucleiod region. The nucleoid region is protected and encased by the cell wall, or cell membrane, the outer layering of the cell (similar to human's skin). Finally, a flagellum (flagetta - plural), a rudder-like device, affords the prokaryote the luxury of mobility. Refer below to the figure for an illustration of the Prokaryote's structure.

General Characteristics

One differentiating characteristic is that prokaryotes are asexual, meaning their offspring nearly always bear the exact characterisitcs of the parent cell. (In fact, the cell essentially replicates itself according to its own DNA and then divides itself from the newly created cell.) Since the Prokaryotes exhibit this asexual behavior as opposed to sexual behavior, where a recombination of chromosones occur to form unique entities (as with humans), evolution of the prokaryotic cell has been fairly stagnant over its two billion year lifespan. Additionally, at the time of Symbiosis, prokaryotes were anaerobic, that is, they did not respirate oxygen as a fundamental necessity to live. As far as nutrition distribution, the small size of prokaryotes provides a high ratio of surface area to volume, making diffusion an adequate means for distributing nutrients throughout the cell.

Abundance

Prokaryotic cells and fossils have have been found in almost every conceivable environment on the earth, from hot sulfur springs to beneath the ocean floor and within larger cells. Overall, Prokaryotes account for a significant portion of the past and present biomass on earth.

Answer 5

Prokaryotes are unicellular organisms, found in all environments. Prokaryotes are the largest group of organisms, mostly due to the vast array of bacteria which comprise the bulk of the prokaryote classification.

Characteristics:

* No nuclear membrane (genetic material dispersed throughout cytoplasm)
* No membrane-bound organelles
* Simple internal structure
* Most primitive type of cell (appeared about four billion years ago)

Examples:

* Staphylococcus
* Escherichia coli (E. coli)
* Streptococcus

Answer 6

Prokaryotes are unicellular organisms who do not have an organized nuclear membrane.They have nuclear material DNA or RNA in the cytoplasm but not in side a nucleus.Prokaryotes comes before the Eukaryotes in the process of evolution Prokaryotes are inferior to Eukaryotes when consider the cellular organization.Because procaryotes do not have a nucleus but Eukaryotes have one.

Answer 7

Prokaryotes are the cells which do not have a proper nucleus as they lack a well defined nuclear membrane. The genetic material of the cell lies scattered in the cytoplasm. For example-Bacteria, fungi etc.

Answer 8

Prokaryotes are organisms without a cell nucleus or indeed any other membrane-bound organelles, in most cases unicellular (in rare cases, multicellular).

Answer 9

Prokaryotes (from Old Greek pro- before + karyon nut or kernel, referring to the cell nucleus, + suffix -otos, pl. -otes; also spelled "procaryotes") are organisms without a cell nucleus (= karyon), or indeed any other membrane-bound organelles, in most cases unicellular (in rare cases, multicellular).

Answer 10

PROKARYOTES are micro oraganisan wich do not have a nucleus their cells contain protoplasm and genetic material


prokarytoes do not have chromosomes , nuclear membrane and a nucleolus


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