lecture 5

Question 1

free energy and metabolis

Answer 1

• exergonic = net release of free energy (spontaneous)
• endergonic = absorbs free energy from surroundings (nonspontaneous)

Question 2

eqm ad metabolism

Answer 2

• metabolism never at eqm
• rxn closed system = do no work
• cells not eqm = open systems

Question 3

ATP power

Answer 3

• kinds of work: Transport; chemical; mechanical (pumping; endergonic rxn; movment)
• energy coupling = use exergonic to drive endergonic
• ATP = exergonic rxn of ATP hydrolysis used to drive endergonic rxn by transferring phosphate group to another molecule (phosphorylated)
• coupled rxn become exergonic
• regeneration = constantly cycled; energy to phosphorylate ADP to ATP come from catabolic rxns in cell