Intro lecture Flashcards
(13 cards)
Rather than consuming energy, what do living organisms do with energy
Convert it from one form to another
Metabolism def.
Science of energy conversion
Caveat 1
Organisms store energy during growth
Caveat 2
Organisms store energy temporarily during activity
First law of thermodynamics
In an isolated system, energy is constant
Most common energy conversion reaction in animals + energy currency of cells
Glucose (chemical energy = ordered) -> CO2 + H2O + heat + ATP
% of organisms genome devoted to metabolism
Approx. 20% of genes
What do organisms really consume
Order
What happens when ice becomes water
Order -> Disorder (difference in entropy– measure of disorder – is positive). High qual. energy -> low qual. Energy
Second law of thermodynamics
Isolated system always tends towards disorder
High qual. energy and low qual energy in Joule’s experiment
HQ: Potential energy of mass on pulley
LQ: Heat (random kinetic energy of water molecules)
Def. of high qual vs low qual energy
High qual energy = order
Low qual energy = disorder
Where do animals take the high qual energy from ?
Complex lipids
Carbohydrates
