BIO 101 WITH 50 TEST QUESTION WITH ACTUAL SOLUTION ALREADY GRADED A+

BIO 101 WITH 50 TEST QUESTION WITH ACTUAL SOLUTION ALREADY GRADED A+ . What is a typical resting potential for neurons? A) +30 mV B) +15 mV C) -55 mV D) -70 mV - ANSWER D: -70 mV . What is the absolute refractory period? A) Sodium channels have returned to their original state B) Sodium and potassium channels are returning to their original state C) Sodium channels are open but potassium channels are closed D) Sodium and potassium channels are open - ANSWER B: Sodium and potassium channels are returning to their original state During normal resting condition, the levels of which positive ions are higher outside the neuron than inside? A) sodium ions B) chloride ions C) potassium ions D) proteins - ANSWER A: sodium ions . Depolarization of a membrane begins with the A) opening of chlorine channels B) opening of sodium channels C) opening of potassium channels D) closing of potassium channels - ANSWER B: opening of sodium channels