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Multicellular organism - Wikipedia

en.wikipedia.org/wiki/Multicellular_organism

Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms. .... In other groups, generally parasites, a reduction of multicellularity occurred, i...

Why do multicellular organisms generally live longer then unicellular ...

www.answers.com/Q/Why_do_multicellular_organisms_generally_live_longer_then_unicellular_organisms

A multicellular organism usually lives longer than a one-celled organism; one- celled organism is limited to the life span of a multicellular organism, however, ...

Unicellular and Multicellular Organisms | Biology@TutorVista.com

biology.tutorvista.com/cell/unicellular-and-multicellular-organisms.html

Unicellular organisms are made up of a single cell like most bacteria, while the ... They live together and all the cells of the colony is the same. ... Nutrition is usually by the process of phagocytosis, where the food particle is engulfed and ... Organisms that consist of more than one cell are known as multicellular organisms.

Telomerase activity coevolves with body mass, not lifespan - NCBI

www.ncbi.nlm.nih.gov/pmc/articles/PMC2693359/

Dec 14, 2006 ... In multicellular organisms, telomerase is required to maintain ... These results suggest that large body mass presents a greater risk of cancer than long lifespan, and ... Longer-lived organisms experience more cell divisions and thus a ... Most of the farm animals are relatively large and long lived, and do not .....

Giardia: A Missing Link between Prokaryotes and Eukaryotes

www2.nau.edu/~gaud/bio372/class/readings/giard.htm

For their first three billion years on earth, living creatures were no larger than a single cell. ... Not only do eukaryotic cells allow larger and more complex organisms to be ... Whether eukaryotic cells live singly or as part of a multicellular organism, their .... Generally, the DNA in a eukaryotic cell looks like a loose tangle of...

How Single-Cell Organisms Evolve Into Multicellular Ones

www.science20.com/adaptive_complexity/how_singlecell_organisms_evolve_multicellular_ones

Feb 20, 2009 ... The evolution of multicellular organisms is a major evolutionary step. ..... You do realize that the scientists grew colonies of unicellular yeast from several .... In some ways Volvox is more like a multicellular organism than a simple colony. ... The reproductive cells are usually confined to one end of the colony, ...

Why do we age? : Article : Nature

www.nature.com/nature/journal/v408/n6809/full/408233a0.html

Nov 9, 2000 ... As a rule, wild animals simply do not live long enough to grow old (Fig. ... For example, because more than 90% of wild mice die in their first year, any ... At a unicellular level, it is therefore unsurprising that ageing is generally not seen ... In multicellular organisms, the need for age structure also applies and ...

The Gates of Immortality | The Scientist Magazine®

www.the-scientist.com/?articles.view/articleNo/29265/title/The-Gates-of-Immortality/

Oct 1, 2010 ... Unicellular organisms were thought to be capable of dividing forever, as long .... I was curious about whether septins might do more than squeeze off a new ... delayed live longer, whereas cells with increased ERC formation die sooner. .... that links aging from molecular to cell and to multicellular organism.

Some Animals Age, Others May Not: What Nature Tells Us About ...

www.senescence.info/aging_animals.html

Bacteria, for instance, are unicellular organisms that reproduce by cell ... progenitor and offspring it was thought that these organisms do not age. .... species like humans that can reproduce more than once during their lifetime. ..... Typically, animals in northern or mountain regions tend to live longer and, usually , mature later, ...

Why are sponges sometimes not considered multicellular?

biology.stackexchange.com/questions/46144/why-are-sponges-sometimes-not-considered-multicellular

May 13, 2016 ... Sponges are generally considered as colonial organisms because there is ... All cells do pretty much the same thing; it looks more like a pile of individual cells than an actual multicellular organism. In reality it is a little bit in between. In any case, what one wants to call multicellular or unicellular is a matter ...

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Why do multicellular organisms generally live longer than unicellular ...

www.answers.com

A multicellular organism usually lives longer than a one cell organism. A one celled organism is ...

Diffusion and the Problem of Size

www.biologymad.com

Jun 18, 2004 ... All organisms need to exchange substances such as food, waste, gases and heat with their surroundings. ... As organisms get bigger their volume and surface area both get bigger, ... So how do organisms larger than 100 mm exists? ... Multicellular organisms have another difference from unicellular ones: ...

Principles of alternative gerontology

www.ncbi.nlm.nih.gov

Mar 25, 2016 ... This is a result of more than one giga-year of evolution of cellular ... In multicellular organisms, damage leading to senescence ... These premature cases of death have, therefore, nothing to do with senescence or aging generally, and .... These mechanisms could not have evolved in unicellular organisms ...