Consider the Transport of K⁺ from the Blood (Where Its

question 54

Multiple Choice

Consider the transport of K⁺ from the blood (where its concentration is about 4 mM) into an erythrocyte that contains 150 mM K⁺. The transmembrane potential is about 60 mV, inside negative relative to outside. What is the free-energy change for this transport process? (These values may be of use to you: R = 8.315 J/mol ^. K; T = 298 K; (Faraday constant) = 96,480 J/V; N = 6.022 × 10²³/mol.)

• A) about 5 J/mol
• B) about 15 J/mol
• C) about 5 kJ/mol
• D) about 15 kJ/mol
• E) It is impossible to calculate with the information given.

---

Definitions:

Diving

The activity of plunging into water from a platform or springboard, often performed competitively to demonstrate skillful acrobatics.

Lagoon

A shallow body of water separated from a larger sea by barrier islands or reefs.

Past Participle

A grammatical form of a verb used to form perfect tenses and passive voice, typically ending in -ed, -en, or an irregular form.

Backup Generator

A secondary power source that automatically provides electricity to a building or facility during a power outage.