What is the free energy change for the inward movement of calcium ions into the bacterial cell?

A cell biologist interested in the transport of calcium ions (Ca2+) across the plasma membrane of bacterial cells made the following measurements on bacterial cells at 25°C:

Vm = ?150 mV [Ca2+] outside = 20 mM [Ca2+] inside = 0.4 mM

A) +4.6 kcal/mol; an endergonic reaction
B) +4.6 kcal/mol; an exergonic reaction
C) ?9.2 kcal/mol; an endergonic reaction
D) ?9.2 kcal/mol; an exergonic reaction
E) +9.2 kcal/mol; an exergonic reaction


Answer: D

Biology & Microbiology

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