1. Biology12
Metabolism

2. the totality of an organisms chemical processes
METABOLISM
the totality of an organisms chemical processes
CATABOLIC PATHWAYS
“Breaking down”
ANABOLIC PATHWAYS
“Building up”

3. Thermodynamics 1st Law of Thermodynamics
energy can be transferred or transformed, but it can be neither created or destroyed

4. Thermodynamics example: you earned $10 babysitting
that $10 was paid to you by the child’s parents who got it from their employer
you use the $10 to buy a snack that costs $2, receiving $8 back in change
of this, $5 goes into the bank and you spend the rest
what has happened to that original $10? has it disappeared?
no, it still exists, but in different forms and belonging to different people

5. Chemical Reactions classified based on free-energy changes exergonic
proceeds with a net release of free energy
energy of products is less than energy of reactants
endergonic
absorbs free energy from its surroundings to proceed
energy of the products is more than energy of the reactants

6. Types of Work a cell does three main types of work:
mechanical – beating of cilia, muscle contraction, chromosome movement
transport – crossing a membrane against the concentration gradient
chemical – building of polymers

7. Questions
page 68 #2, 3, and 4