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Membrane

Definition

noun, plural: membranes

(1) (biology) A thin layer of tissue covering a surface or lining a cavity, space or organ.

(2) (biology) A cell membrane.

(3) (chemistry) A thin pliable sheet of material that is permeable to substances in solution.


Supplement

A biological membrane functions by protecting the surface or bodily organ. It acts as a barrier against injurious substances. It also acts as a film or covering separating two regions. It may also connect structures or organs of an animal or a plant.


Word origin: Latin membrāna, skin, from membrum, member of the body.

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Totipotent Stem Cell From Molecular Components

... to make an animal cell from DNA, RNA, Protein, and Fatty Acids as well as Glucose and other sugars. I am wondering. Should I start with the cell membrane or the nucleus and nucleolus(both are very important)? Q2 The pace of DNA replication is 8 2/3 hours for every chromosome and 2097152 of each ...

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by caters
Sun Feb 02, 2014 10:58 pm
 
Forum: Cell Biology
Topic: Totipotent Stem Cell From Molecular Components
Replies: 0
Views: 571

Multicellular prokaryote

Yes,it makes perfect sense. Here, another question arises. Does absence of endomembrane system have to mean that it can't be multicellular?? Since prokaryotes have lot of unevenings in their plasma membrane(invaginations and outgrowths)and because of their small ...

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by Sumanth001
Sat Nov 30, 2013 5:08 pm
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 24
Views: 17563

Re: Multicellular prokaryote

... of a eukaryote was a nucleus, and there is reason to believe that these other important characteristics are related to that and to each other: endomembrane system, membrane bound organelles, sexual reproduction (associated with diploid or more), and endocytosis. Quite literally, eukaryotic cells ...

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by thirdprometheus
Fri Nov 15, 2013 7:45 pm
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 24
Views: 17563

Re: Re:

... pumping muck into the river at a faster rate than the detoxifying agent, the muck should being accumulating . But natural selection is more like a membrane, only allowing a set amount of the muck to pass through. The more muck there is spilling into the river, the more filtering the membrane does.

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by wildfunguy
Sat Oct 19, 2013 9:18 pm
 
Forum: Evolution
Topic: Beneficial mutations vs harmful
Replies: 12
Views: 3809

Bacterial Taxonomy

... Bacteria The major phyla of the deeply branching bacteria are Chlorflexi, Deinococcus-Thermus, and Aquificae. What are their cell walls and membranes like? Deinococcus has an outer membrane similar to that of Gram-negatives, but it stains as Gram-positive, so it somehow retains the crystal ...

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by wildfunguy
Sat Oct 19, 2013 6:12 pm
 
Forum: Microbiology
Topic: Bacterial Taxonomy
Replies: 3
Views: 1530
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