Bioenergetics

Question 1

What is the First Law of Thermodynamics?

Answer 1

Energy can neither be created nor destroyed

Question 2

What sign does an exothermic reaction have?

For enthalpy

Answer 2

Negative

Question 3

What is the Second Law of Thermodynamics?

Answer 3

Universe always tends towards increasing disorder-Entropy

Question 4

What makes a spontaneous chemical reaction

Answer 4

Delta G= Delta H (enthalpy)-T X delta S (entropy)

Gibbs Free Energy

Question 5

What type of reaction is endergonic?

Answer 5

One where the products free energy is more than the reactants

Does not occur spontaneously

Question 6

Delta G naught (standard change in free energy)

Answer 6

Energy change when reactants and products are at a conc. of 1mol/L-useful in comparing the energy changes from different reactions

Question 7

Negative Delta G

Answer 7

1. Exergonic
2. Spontaneously

Question 8

Positive Delta G

Answer 8

1. Endergonic
2. Not spontaneous

Question 9

Delta G is zero

Answer 9

Reaction is at equilibrium

Question 10

Are delta G pathways additive?

Answer 10

Yes-as long as the sum of delta G of the individual reactions are negative

Question 11

Keq >1

Answer 11

Forward direction: Negative #

Question 12

Keq <1

Answer 12

Reverse, positive #

Question 13

Keq=1

Answer 13

Equilibrium, G=0