Which structure is/are responsible for maintaining the resting potential? - correct answer Leak channels (un-gated ion channels) and sodium potassium
... [Show More] pumps
Stage D (on the graph) is the ________ stage and during this stage the ______ are open. - correct answer undershoot: voltage-gated potassium ion channel
You could make the positive voltage peak of the action potential lower by: - correct answer closing the deactivation fat of Voltage-gated sodium ion channel at a faster rate
To prevent the undershoot stage (D) the ______ would have to close at a ________ rate. - correct answer Voltage-gated sodium ion channel; faster
If the axon was at resting potential, what would happen if you blocked all leak channels, but left the sodium-potassium pump running? - correct answer The membrane potential would become more negative
What if you engineered a neuron with a voltage-gated calcium channel tat stayed open longer than a typical neuron. Compared to a typical neuron, how would this engineered neuron's action potential differ? - correct answer It would be the same
Normally the sodium-potassium pump moves three sodium ions for every two potassium ions. What would happen to the resting potential if the pump moved six sodium ions and four potassium ions? - correct answer It would become more negative
Blocking the voltage-gated calcium channels in a neuron would: - correct answer prevent the release of neurotransmitter into the synapse
When a new mutation in a gene occurs, what is the potential fate of the individual having that change? - correct answer They may be more successful at surviving and reproducing than those in the population that don't have the new trait.
They may be less successful at surviving and reproducing than those in the population that don't have the new trait.
They may be no different in their success at surviving and reproducing than those in the population that don't have the new trait.
All of the above
A mutation of a regulator gene increases the production of negatively charged macromolecules inside a nerve cell. What effect would this have on the ability of the cell to propagate an actin potential? - correct answer It would hyper polarize the cell and make it less likely to fire.
If you experimentally increase the concentration of Na+ outside a cell while maintaining other ion concentrations as they were, what would happen to the cell's membrane potential? - correct answer The membrane potential would increase, and the inside would be more negative compared to the outside
What is the evidence that hemoglobin was no longer necessary for ice fish to transport oxygen to their body tissue? - correct answer The lose and degradation of the genes responsible for the globin part of the hemoglobin
What does it mean to say an animal is a homeothermic ectotherm? - correct answer Its body temperature does not vary and it gets most of its heat from outside its body
Which is not an adaptation of Ice fish to increase the exchange of oxygen in cold water? - correct answer The lose of scales and increase in capillary size in the skin
The lose of the ability to produce hemoglobin
The evolution of a larger heart
The evolution of increased gill surface area
All of the above are adaptations to increase the exchange of oxygen [Show Less]