Air, water, and other organisms as a form of symbiotic relationships
For a neuron with an initial membrane potential at -70mV, an increase in the movement of potassium ions out of that neuron's cytoplasm would result in B. Hyperpolarization of the neuron.
A normal neuron's resting potential (potential across the membrane) ranges from -60 millivolts to -70 millivolts. This indicates that the cell's interior is negatively charged in comparison to the exterior.
When the membrane potential shifts more negatively at a specific location on the neuron's membrane, this is known as hyperpolarization. Hyperpolarization may result from the opening of channels that allow positive ions to exit the cell or negative ions to enter.
<u>Example</u>: Hyperpolarization may result from the opening of channels that allow potassium ions to exit the cell.
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The corrrect option is D.
Since the scientist was trying to determine if substance A affect the rate of reaction of X and Y, the best thing to do is to make substance X and Y to react together first, he should then measure the time taken for the reaction to take place. Next, he should make X and Y to react together again, but this time in the presence of A. The time taken for the reaction to occur should be measures. The scientist can now compared the two time measurements and decide if there are difference between them or not.