QI: Bacterial Potassium Channel Properties:(Selective Filter) l) Conserved AA sequence II) A A 's produce five O -atom rings III) Channel size is large enough for hydrated- K + IV) One K + ion per eight O -atom interactions V) Four ions are capable of being in channel at a given moment A) I + I V B) I + II + I V C) A II QII: Ca2+ Transport Protein (Purified)(Protein = Only membrane transporter) *Increasing [ATP] internally doesn't affect exterior [Ca2+] * Increasing [Ca2+] internally increases [Ca2+] exteriorly - Determine the transporter type: A) Na + / Ca 2 + (Coupled Symporter) B) Ion C) Active Transporter (Primary) QIII: Which has a change in affinity? A) Voltage-Gated K + Channel B) Na + Channel C) Glucose/Na+ (Coupled Antiporter).