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i i am looking for nonexamples of organell?

2007-09-25 11:47:59 · 5 answers · asked by Beatriz 1 in Science & Mathematics Biology

5 answers

i dont remember but i think i learned it

2007-09-25 11:50:14 · answer #1 · answered by ***KREEM YUNG*** 1 · 0 0

In cell biology, an organelle is a discrete structure of a cell having specialized functions, and is separately enclosed in its own lipid membrane. There are many types of organelles, particularly in the eukaryotic cells of higher organisms. Prokaryotes were once thought not to have any organelles, but some examples have now been identified, although these are not widespread.

The name organelle comes from the idea that these structures are to cells what an organ is to the body (hence the name organelle, the suffix -elle being a diminutive). Organelles are identified through the use of microscopy, and can also be identified by cell fractionation.

Examples and disputes
Some cell biologists consider the term organelle to be synonymous with "cell compartment", other cell biologists strictly limit the term's definition to DNA-containing, formerly autonomous organisms acquired via primary, secondary, or tertiary endosymbiosis. A few of such large organelles having originated from endosymbiont bacteria:

mitochondria (in almost all eukaryotes)
plastids (in plants, algae and protists)
chloroplasts (mature forms of etioplasts)
chromoplasts
leucoplasts
amyloplasts
statoliths
elaioplasts
proteinoplasts
rhodoplasts (in red algae)
apicoplasts (in the malaria parasite, Plasmodium falciparum)
Other organelles are also suggested to have endosymbiotic origins (notably the flagellum; see evolution of flagella), but these hypotheses are not widely accepted nor phylogenetically verified.

Not all parts of the cell qualify as organelles, and the use of the term to refer to some structures is disputed. These structures are large assemblies of macromolecules that carry out particular and specialised functions, but they lack membranes boundaries. Such cell structures, which are likely not organelles, include:

ribosome
cytoskeleton
flagellum

2007-09-25 18:54:14 · answer #2 · answered by kathy y 2 · 1 0

ORGANELLES mean little organs. Basically this means that organelles have specific roles to play in how cells work just like organs help the body to function properly as a whole. Some organelles are separated from the rest of the cell by lipid bi-layers similar in structure to the cell membrane.

2007-09-25 18:52:17 · answer #3 · answered by Destruction 2 · 1 0

What do you mean by nonexamples?
I know that an organelle would be the nucleus, endoplasmic reticulum, the Golgi apparatus and a lot more...
But a nonexample? Im not sure.

2007-09-25 18:52:01 · answer #4 · answered by |m|(>.<)|m| MeganManic 3 · 0 1

These are not organelles:
nucleus, nucleolus, ribosomes, plasma membrane, cell wall, microtubules, microfilaments

2007-09-25 18:52:13 · answer #5 · answered by ecolink 7 · 0 1

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