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Cell

Definition

noun

(Science: Cell Biology)

1. The structural, functional and biological unit of all organisms.

2. An autonomous self-replicating unit that may exist as functional independent unit of life (as in the case of unicellular organism), or as sub-unit in a multicellular organism (such as in plants and animals) that is specialized into carrying out particular functions towards the cause of the organism as a whole.

3. A membrane bound structure containing biomolecules, such as nucleic acids, proteins, and polysaccharides.


Supplement

There are two distinct types of cells: prokaryotic cells (e.g. bacterial cells) and eukaryotic cells (e.g. plant or animal cell). The main difference between the two is a well-defined nucleus surrounded by a membranous nuclear envelope present only in eukaryotic cells. Despite this difference they share a number of common features: the genetic information is stored in genes, proteins serve as their main structural material, ribosomes are used to synthesize proteins, adenosine triphosphate is the main source of metabolic energy to sustain various cellular processes, and a cell membrane that controls the flow of substances into and out of the cell.


Word origin: From Latin cella.
Related forms: cellular (adjective)
See also: cell biology, cytology, stem cell.


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Need some help with a question

In the cell cycle, at which stages do two chromatids make up one chromosome? (Can be multiple answers) a. beginning of mitosis b. end of G1 phase c. beginning of S (Synthesis) d. end of mitosis e. beginning of G2 phase

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by nillkill
Sat Mar 22, 2014 5:49 pm
 
Forum: Cell Biology
Topic: Need some help with a question
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Views: 137

genetic

) A diploid cell contains three pairs of homologous chromosomes designated C1 and C2, M1 and M2, and S1 and S2. No crossing over occurs. a. What combination(s) of chromosomes are possible in daughter cells following mitosis? b. ...

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by lachatausa
Fri Mar 21, 2014 2:55 am
 
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Transpiration and Photosynthesis.

Seriously? Do you have any idea, what is the concentration of water? Even if we assume that the cell is crowded, I'm sure the metabolism doesn't significantly influence concentration of water. Shouldn't be the question the other way - how does transpiration affect photosynthesis?

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by JackBean
Fri Mar 14, 2014 10:34 am
 
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Re: are biological mushrooms with virus combinable?

The ovum can be considered as single-cell fungi. And sperm - as a virus. ....... In the human body arise other ovum-like cells. They can give rise to cancer, but to cause hermaphroditism if they meet with the "viruses".

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by enarees
Thu Mar 06, 2014 3:14 am
 
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Who made the theory about how the first cell came to be?

I'm wondering if anyone knows who made the theory about how the first cell or mitochondria came to be? I mean the theory that the first cell or mitochondria was made by chemical processes and other natural phenomenon. Does anyone has his or her name, and perhaps ...

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by Anonymous99
Wed Mar 05, 2014 10:42 pm
 
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Topic: Who made the theory about how the first cell came to be?
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