introduction to metabolism Flashcards
sum of chemical reactions
governed by principle of mass, all reactions are reversible
What is metabolism
the sum of chemical reactions occuring in a living organism
what does free energy provide
a single criterion as to which direction a reaction will go
what is the enthalpy H of reactants or of products equal to
their total bond energies
first law of thermodynamics
energy cannot be created nor destroyed
second law of thermodynamics
the total entropy (disorder) of a system always increases over time
free energy <0
exergonic, favoured, catabolism
free energy >0
endergonic, unfavoured, anabolism
what must occur for linking reaction to proceed
decrease in free energy must occur elsewhere in the system
what is free energy expressed in
Kcal
what is 1Kcal equal to
1Kcal is mount of energy required to raise temp of 1kg of water by 1deg
when is a reaction more favoured
when the delta naught prime is further in the negatives
what is catabolism
a series of reactions that break down biomolecules into smaller molecules
what is anabolism
growth, cell division, storage
what is ATPase
breakdown of ATP
when is a compound oxidised
gains oxygen atoms or loses hydrogen
when is a compound reduced
loses oxygen or gains hydrogen
NAD = what
AMP + nictotinamide mononucleotide
what compounds serve as oxidants by accepting H from metabolites
NAD+, NADP+, FAD
what compounds serve as reductions, donating H
NADH, NADPH, FADH2
