Homework Answers
The gated channels are the Ion channels which are generally transmembrane proteins. They are opened in response to a stimulus. The gated channels are of three types:- voltage gated Ion channels, ligand gated Ion channels and mechanically gated Ion channels.
Voltage gated Ion channels open in response to change in the potential of membrane. Example Ion channels used in generation of action potential.
Ligand gated ion channels are the channels which are opened in response to a specific ligand or a neurotransmitter binding to the receptor. Example muscarinic receptors on binding with Acetylcholine.
Mechanically gated ion channels open in response to the physical the formation of the receptor as in the case of pain and touch.
Potassium leak channels are not gated channels
Answers are options a b c.
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QUESTION 18 Gated ion channels include each of the following except O A. voltage-gated channels. OB....
determine whether each term or phrase describes ligand-gated ion channels, voltage-gated ion channels, or both.
determine whether each term or phrase describes ligand-gated ion channels, voltage-gated ion channels, or both.
choices for A: Na+/K+ pumps, voltage gated K+ channels, voltage gated Ca+ channels, voltage gated Na+...
choices for A: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
choices for B: bidirectionally, unidirectionally
choices for C: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
choices for D: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
Consider this graph illustrating the generation of an action potential across the plasma membrane of a stimulated neuron. +40 ACTION POTENTIAL plasma membrane potential...
An action potential does not move back wards in the axon because.. a.Voltage-gated sodium channels behind...
An action potential does not move back wards in the axon because.. a.Voltage-gated sodium channels behind the action potential are inactivated. b. Potassium leak channels no longer let potassium ions through c. Voltage-gated sodium channels are open d. Mechanically-gated channels prevent outflow of sodium e. Voltage-gated potassium channels are closed
An ion channel inhibitor is discovered which selectively targets potassium ion voltage-gated channels. Which of the...
An ion channel inhibitor is discovered which selectively targets potassium ion voltage-gated channels. Which of the following effects would this inhibitor most likely have on neurons? and here are the answer choices, A. Decrease in the sensitivity of action potential generation B. Increase of the resting potential of the cell to 0 mV C. Inhibition of repolarization after an action potential D. Inhibition of action potential depolarization
Which choice represents transport proteins in a neuron? a. Voltage-gated channels and passive transporters b. Passive...
Which choice represents transport proteins in a neuron? a. Voltage-gated channels and passive transporters b. Passive transporters and sodium-potassium cotransporters c. Sodium-potassium cotransporters, passive transporters, and voltage-gated channels d. Voltage-gated channels and passive transporters e. Sodium-potassium cotransporters and voltage-gated channels
(what type of Voltage sensors in the Nav channels are thought to be a run of...
(what type of Voltage sensors in the Nav channels are thought to be a run of amino acids) O positive o negative O neutral What are 4 major types of potassium channels (classified based on activation)(choose ALL that apply) Voltage gated Potassium activated Leak channels (tandem pore) outward rectifying inward rectifying calcium activated The Number 4 transmembrane segment is a common and well established voltage sensor containing charged amino acids. Which of the following has/have these sensors? o Stretch channels...
Ion channels are involved with generating action potentials. Below is an electrical profile of a neuronal action potent...
Ion channels are involved with generating action potentials. Below is an electrical profile of a neuronal action potential. In the boxes below list whether the channels are all open, all closed, opening, or closing at each of the letters shown in the profile. (Opening implies that channels were "all closed" and are moving toward their "all open" state. Closing indicates the opposite. Use the term "closing" to represent the inactivated state of the Na+ channels.) (7 pts) 1. Channel Type...
Voltage-gated Na channels exist in three distinct conformations in axons because Answers A-D A they assume...
Voltage-gated Na channels exist in three distinct conformations in axons because Answers A-D A they assume an inactivated conformation shortly after opening, which ensures that the action potential cannot move backwards toward the cell body. B they change conformation when binding Nat and transporting it to the opposite side of the membrane before releasing it outside the cell. C they respond to ligand binding, mechanical stress, or changes in voltage. D they assume different conformations as ATP is bound and...
Question 17 In saltatory conduction, the Nodes of Ranvier: O inhibit the Hodgkin cycle. lack voltage-gated...
Question 17 In saltatory conduction, the Nodes of Ranvier: O inhibit the Hodgkin cycle. lack voltage-gated ion channels. are electrical synapses, are the sites of cross-membrane current flow are incased in a myelin sheaf.
Assume a mutation of the gene coding for the voltage-gated sodium channel resulted in channels that...
Assume a mutation of the gene coding for the voltage-gated sodium channel resulted in channels that do not have the ball and chain part of the protein. Which of the following would you expect to see? a. A change in the ion selectivity of the channel of the mutated channels, allowing ions other than sodium to move through it. b. A change in the voltage sensitivity of the channel so that it does not open until more depolarized voltages. c....
determine whether each term or phrase describes ligand-gated ion channels, voltage-gated ion channels, or both.
choices for A: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
choices for B: bidirectionally, unidirectionally
choices for C: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
choices for D: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
Consider this graph illustrating the generation of an action potential across the plasma membrane of a stimulated neuron. +40 ACTION POTENTIAL plasma membrane potential...
(what type of Voltage sensors in the Nav channels are thought to be a run of amino acids) O positive o negative O neutral What are 4 major types of potassium channels (classified based on activation)(choose ALL that apply) Voltage gated Potassium activated Leak channels (tandem pore) outward rectifying inward rectifying calcium activated The Number 4 transmembrane segment is a common and well established voltage sensor containing charged amino acids. Which of the following has/have these sensors? o Stretch channels...
Ion channels are involved with generating action potentials. Below is an electrical profile of a neuronal action potential. In the boxes below list whether the channels are all open, all closed, opening, or closing at each of the letters shown in the profile. (Opening implies that channels were "all closed" and are moving toward their "all open" state. Closing indicates the opposite. Use the term "closing" to represent the inactivated state of the Na+ channels.) (7 pts) 1. Channel Type...
Voltage-gated Na channels exist in three distinct conformations in axons because Answers A-D A they assume an inactivated conformation shortly after opening, which ensures that the action potential cannot move backwards toward the cell body. B they change conformation when binding Nat and transporting it to the opposite side of the membrane before releasing it outside the cell. C they respond to ligand binding, mechanical stress, or changes in voltage. D they assume different conformations as ATP is bound and...
Question 17 In saltatory conduction, the Nodes of Ranvier: O inhibit the Hodgkin cycle. lack voltage-gated ion channels. are electrical synapses, are the sites of cross-membrane current flow are incased in a myelin sheaf.
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