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9 Bioenergetics
(a) Which of these reactions are endergonic?
(b) In your cells, what is the equilibrium constant for p-kinase reaction?
(c) How much free energy is available in reaction 2?
(d) After sufficient time, why do not the enzymes in these reactions affect the
resultant product concentrations?
9.15 Suppose a developing egg has a net outflow of heat of 280 cal/h into the
environment at an incubation temperature of 39 ◦ C. What is the average rate of
entropy drop in the egg?
9.16 If a cell with a salinity concentration of 1.5 mmolar is placed in pure water at
37 ◦ C, estimate the osmotic pressure that builds in the cell?
9.17 The water vapor in our lung alveoli is close to saturation. On expiration, the air
from our lung expands, and its pressure drops. It may also be cooled by the outside
air. To see the effect of cooling, take an expiration volume of 0.5 L. If this volume
is cooled from 37 to 0 ◦ C, how much water condenses (to tiny droplets)?
9 Bioenergetics
(a) Which of these reactions are endergonic?
(b) In your cells, what is the equilibrium constant for p-kinase reaction?
(c) How much free energy is available in reaction 2?
(d) After sufficient time, why do not the enzymes in these reactions affect the
resultant product concentrations?
9.15 Suppose a developing egg has a net outflow of heat of 280 cal/h into the
environment at an incubation temperature of 39 ◦ C. What is the average rate of
entropy drop in the egg?
9.16 If a cell with a salinity concentration of 1.5 mmolar is placed in pure water at
37 ◦ C, estimate the osmotic pressure that builds in the cell?
9.17 The water vapor in our lung alveoli is close to saturation. On expiration, the air
from our lung expands, and its pressure drops. It may also be cooled by the outside
air. To see the effect of cooling, take an expiration volume of 0.5 L. If this volume
is cooled from 37 to 0 ◦ C, how much water condenses (to tiny droplets)?