ANA 442 Cumulative Quizzes Spring 2022 with complete solutions

ANA 442 Cumulative Quizzes Spring 2022 with complete solutions Which of the following statements about action potentials is FALSE? X The magnitude of the AP is proportional to the magnitude of the stimulus that evoked it - APs are initiated only when the membrane potential rises above a threshold. - APs can be propagated along neuronal processes with little or no decay. - APs can sometimes propagate in dendrites, in addition to axons. Actin filaments: - Can cause membrane protrusions responsible for cell shape changes and cell movement - Interact with other scaffolding proteins in the synpase active zones - Are concentrated at peripheral sites near the plasma membrane, including at pre- and postsynaptic sites. X All of the above - None of the above Calcium ions (Ca2+) entering the presynaptic terminal binds to: - Synapsin X Synaptotagmin - SNAP-25 - Rab3 Which of the types of proteins synthesized on free ribosomes (rather than ribosomes associated with the endoplasmic reticulum)? X Nuclear and cytoplasmic proteins - Secreted proteins - Transmembrane proteins - All of the above - None of the above Each odorant activates many ORNs, and each ORN is activated by multiple odorants. What does this suggest about the detection of odor? - Each odorant is identified by activating a receptor unique to that specific chemical X Each odorant activates a unique set of ORNs and this combination results in identification of the specific chemical - Odorant identification is dependent on the volume of chemical available to receptors The heteromeric T1R2 + T1R3 re