Ch 4: Biochemistry

Question 1

Thermodynamics: ∆ G= ∆H - T ∆S. Therefore,, a reaction is more thermodynamically favorable when a reaction is (exo/endothermic) and the entropy (increases/decreases)

Answer 1

Exothermic (heat EXits the system); increases

Question 2

Thermodynamics: -∆G means (exer/endogornic)

Answer 2

Exergonic (energy EXits the system)

Question 3

Thermodynamics: The difference between K’eq and Q:

Answer 3

K’eq is the ratio of the concentration of products and reactants at equilibrium, and is one number for a set condition;
Q is the same ratio at the start of the reaction, and can be any one number

Question 4

Thermodynamics: When K’eq is large, the (reactant/product) has lower ∆G;
when Q is large, the (reactant/product) has lower ∆G

Answer 4

product;

can’t tell b/c Q does not say anything about equilibrium

Question 5

Thermodynamics: Spontaneous reaction is determined by two factors, which are:

Answer 5

1. Intrinsic properties of reactant and product (∆G)

2. Concentration of reactant and product

Question 6

Enzymes: What does it effect? Not effect?

Ea; ∆G; reaction rate; concentration of reagent and products;

Answer 6

Lowers Ea and therefore the reaction rate

Cannot effect ∆G or concentration

Question 7

Enzymes: (T/F) Increases the speed of reaction regardless of ∆G

Answer 7

T.

Question 8

Enzymes: Reactions with +∆G is driven with ___, which utilizes _____ with the unfavorable reaction. Therefore, the overall ∆G is (negative/positive/net zero)

Answer 8

reaction coupling; ATP hydrolysis;

negative