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How the nut rients that we are ingest ing
daily become part o f our body and allowgrowth to occur (what is the f at e of thesugar, f at , prot ein and nucleic acids that
ent er our body along with the food ?)
Why do we become f at by only eat ingsugar?
What is the molecular nat ure of the large
number of genet ic diseases? How can we f ind ways to prevent and t reat them?
What does O2 do for us?
How do the various living organisms
´produceµ and ´consumeµ energy? «
Did you ever ask these questions?Did you ever ask these questions?
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Met abolismThe tot alit y of the
t ransformat ion of biomolecules (matt er) and energy
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Definition of Metabolism
The ent ire highly int egrat ed andregulat ed network of chemicalt ransformat ions (as st epwise met abolicpathways cat alyzed by many enzymes)
occurring in a living organism (through
which cells ext ract energy and reducingpower f rom its environment , as well as
synthesize the building blocks of its
macromolecules and then themacromolecules themselves).
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Metabolism is categorized into two types
Cat abolism (degradat ion): larger
molecules (nut rients and cell
const it uents) are broken down (oft en via
exergonic react ions) to salvage (reuse)their components or/and to generat e
energy.
Anab
oli
sm(bi
osyn
the
sis
):Th
e generat io
nof biomolecules f rom simpler
components (oft en via endergonic
react ions).
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Major Roles of Metabolism
Ext ract energy and reducing power(oxidat ive degradat ion of nut rients).
Generat ion (int erconversion) of all
the biomolecules for a livingorganism.
Thus comes the t erm
´Dynamic Biochemist ryµ
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(Fuels)
Extract energy and reducing power
ATP: Energy currency
Generate all biomolecules
The role of Metabolism
Also for mobility,transport of nutrients
and so on.
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General Features of Metabolism
Occurs in speci f ic cellular (t issue and organ)locat ions as a series of enzyme-cat alyzed linear,branched or circular react ions, or pathways.
Highly coupled and int erconnect ed.
Highly regulat ed (oft en reciprocally) to achievethe best economy (´Balanced supply anddemandµ).
The number of react ions is large (over 1000),
however, the number of t ypes of react ions is relat ively small.
Well conserved during evolut ion: re f lect ing theunit y of the li f e phenomena (´what happens in
bact eria
happen
sin
hu
man beingµ).
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