BIO 151 FINAL Exam Study Quiz Questions with Correct Answers

BIO 151 FINAL Exam Study Quiz Questions with Correct Answers A) binding with only one type of neurotransmitter. B) permitting passage by positive but not negative ions. C) permitting passage by negative but not positive ions. D) ability to change its size depending on the ion needing transport. E) permitting passage only to a specific ion. - Answer-E) permitting passage only to a specific ion. The following steps refer to various stages in transmission at a chemical synapse. 1. Neurotransmitter binds with receptors associated with the postsynaptic membrane. 2. Calcium ions rush into neuron's cytoplasm. 3. An action potential depolarizes the membrane of the axon terminal. 4. The ligand-gated ion channels open. 5. The synaptic vesicles release neurotransmitter into the synaptic cleft. Which sequence of events is correct? A) 4 → 3 → 1 → 2 → 5 B) 1 → 2 → 3 → 4 → 5 C) 5 → 1 → 2 → 4 → 3 D) 2 → 3 → 5 → 4 → 1 E) 3 → 2 → 5 → 1 → 4 - Answer-E) 3 → 2 → 5 → 1 → 4 The nucleus and most of the organelles in a neuron are located in the A) axon hillock. B) axon terminals. C) axon. D) dendritic region. E) cell body. - Answer-E) cell body. The operation of the sodium-potassium "pump" moves A) sodium and potassium ions into the mitochondria. B) sodium and potassium ions out of the cell. C) sodium ions out of the cell and potassium ions into the cell. D) sodium ions into the cell and potassium ions out of the cell. E) sodium and potassium ions into the cell. - Answer-C) sodium ions out of the cell and potassium ions into the cell. Two fundamental concepts about the ion channels of a "resting" neuron are that the channels A) are always open, but the concentration gradients of ions frequently change. B) are always closed, but ions move closer to the channels during excitation. C) open and close depending on chemical messengers, and are nonspecific as to which ion can traverse them. D) open in response to stimuli, and then close simultaneously, in unison. E) open and close depending on stimuli, and are specific as to which ion can traverse them. - Answer-E) open and close depending on stimuli, and are specific as to which ion can traverse them.