Handout2_91409

Handout2_91409 - BIO 1A General Biology GSI: Diana Nguyen...

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BIO 1A General Biology GSI: Diana Nguyen UCBDiana@gmail.com OH: W 1-2, F 10-12 2084 VLSB 1 Handout #2 Metabolism Metabolism – is the summation of an organism’s chemical reactions 1. Metabolism involves 2 pathways: 2. Catabolic pathway – breaks down complex molecules to simpler compounds in order to release energy ( exergonic ) Example: Break down glucose in order to form CO 2 , H 2 O, and release ATP 3. Anabolic pathway – absorbs energy ( endergonic ) to build complex molecules from simpler molecules Example: Use energy to form large proteins from amino acids **** How to differentiate between catabolic and anabolic: CATApults destroy or break things down; anabolic steroids build up muscle Gibbs Free Energy (ΔG) o Δ G is the change in free energy between reactants and products o Δ G<0 Exergonic reaction, energy is released When Δ G<0 (or when it is negative), the reaction will be favored and will released energy. The energy released equals the maximum amount of work that can be performed as a result of the chemical energy. o Δ G>0 Endergonic reaction, energy is required When Δ G>0, energy would have to be added to the system to make the reaction go o Δ G=0 Equilibrium *Cells would die if they had Gibbs free energy because they’re always expending energy to do various reactions C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O + Energy (Released as ATP + Heat) ΔG = 686kcal **Know this equation!** Enzymes
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Handout2_91409 - BIO 1A General Biology GSI: Diana Nguyen...

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