membrane reuis whih of the through which peirs) of pro (al dy nemin and cltin ic
ID: 280812 • Letter: M
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membrane reuis whih of the through which peirs) of pro (al dy nemin and cltin ict V-sNARE and T-SNARE idi a and b 12. The Na-pump is an example of which of the followin (a) antipont c) unipon id) none ef the aboNe 13. The glucoNG-Napump is an example of shich of the following (a) antiport (b) sympon idi none of the ahove 14. The Nar channel is an example of which of the following types of ion channels? (a) voltage-psted (c) Stress-gated b) ligand-gated (d) none of the above 15. Propagation of an action potential along an ason requires which of the following? (a) release of neurotransmitters (b) activation of the Car channel (c) activation of the Na channel (d) formation of synaptic vesicles 16 Conversion of an electrical signal to a chemical signal at the nerve terminus does not require which of the following? (a) depolarization of the membrane (b) activation of the Car channel (c) activation of the Nar channel (d) formation of synaptic vesicles 17. The Acetylcholine receptor is an example of which of the following types of ion channels (a) voltage-gated (h) ligand-gated (c)Stress-gated (d) none of the above 18. Propagation of an action potential along ana is bi-directional (a) true 19. Where does most membrane synthesis take place in cukaryotic cells? (c) false (a) lysosome (b) ribosome (c) smooth ER (d) Golgi apparauExplanation / Answer
12. c. uniport
Explanation- Uniport proteins (ion channels or carrier proteins) are involved in facilitated diffusion. Voltage-gated sodium pumps are a perfect example of uniport which helps in the propagation of a nerve impulse across the neuron.
13. b. symport
Explanation- Symport is a type of membrane protein which transports two substances in the same direction at the same time. Na+ transporter transport Na+ ions and glucose.
14. a. voltage gated
Explanation- Voltage gated channels are a specific type of ion channels which are activated by the alteration of membrane protein conformation with the change of membrane potential in the vicinity of the ion channel. Na+ channels are highly active in neurons to raise the action potentials. So they are classified as voltage gated ion channels.
15. c. activation of the Na+ channel
Explanation- Na+ ion channels are voltage gated and largely present in neurons to raise the action potential across the membrane. They change their conformation in 3 forms- resting, active and inactive states. Among them the active phase is the working phase.
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