Dictionary » P » Precursors



Something that precedes.

1. (Science: biochemistry) In biological processes, a substance from which another, usually more active or mature substance is formed.

2. In clinical medicine, a sign or symptom that heralds another.

Origin: L. Praecursor = a forerunner

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Re: adult stem cells, differentiated cells and proliferation

Hi cathbr, 1) Yes they are Somatic cells, the definition of a somatic cell is - Any cell in a multicellular organism except gametes and their precursors. As to your second set of questions if you are talking about replicating, then yes differentiated cells do proliferate in vivo, generally via ...

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by Amphibitile
Sun Jun 23, 2013 1:11 am
Forum: Cell Biology
Topic: adult stem cells, differentiated cells and proliferation
Replies: 2
Views: 2321

Re: How Genes/expression Determine Organism Shape

... interactions leading to cell differentiation and/or cell death. I will try giving the most simplistic embryo example. You have 3 layers of cells (precursors that can become anything). Cells in layer 1 and 3 sense another cell layer on one side only and "environment" on the other side. ...

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by Cat
Mon May 20, 2013 1:41 pm
Forum: Genetics
Topic: How Genes/expression Determine Organism Shape
Replies: 2
Views: 5341


Hello I am studying to be a vet and have just done an experiment on Gluconeogenesis looking at the different precursors. I am a bit stuck on why lactate and alanine might be of different efficiency as gluconeogenic substrates, because they are both converted into pyruvate?? Lactate ...

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by beckyacoles
Tue Nov 13, 2012 4:01 pm
Forum: Cell Biology
Topic: Gluconeogenesis
Replies: 8
Views: 7100

Re: Do the simplest bacteria have ribosomes and helicase?

Some chemical reactions were likely producing biochemical precursors and replicating the molecules needed to catalyze the precursor-building reactions prior to their capture within a cell membrane. These reactions that build the parts of the system which ...

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by jonmoulton
Wed May 23, 2012 9:00 pm
Forum: Molecular Biology
Topic: Do the simplest bacteria have ribosomes and helicase?
Replies: 27
Views: 13996

Mitosis vs. Meiosis in animals spec. Humans also

... go down to the gametogenesis and that's because you cannot just divine your current cells with meiosis, but you still need to keep some precursors for futher gamete production

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by JackBean
Fri Nov 25, 2011 4:09 pm
Forum: General Discussion
Topic: Mitosis vs. Meiosis in animals spec. Humans also
Replies: 2
Views: 2963
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