What happens when a ligand binds to a ligand-gated sodium channel?
A. Sodium ions flow passively from high
concentration to low concentration.
B. Sodium ions are pumped from low
concentration to high concentration.
C. Sodium ions flow passively from low
concentration to high concentration.
D. There is no net flow of sodium ions.
A
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The scientific method has limitations. It can only answer objective questions based on quantitative facts from observable, measurable, and repeatable experiments
It cannot answer subjective questions based on qualitative beliefs or opinions such as the presence of deities and ghosts or who makes the best doughnut. Could the scientific method theoretically be used to answer the question, "Does throwing a virgin into a volcano prevent it from erupting?" Support your answer.
The structural support of xylem is mainly due to the presence of a compression and decay-resistant tough polymer known as
a. sporopollenin b. chitin c. cellulose d. lignin e. restin
Conducting tubes of phloem consist of stacks of ____.
A. dead sieve elements B. living sieve elements C. dead vessel elements D. living vessel elements E. dead companion cells
The outside of a neuron is positively charged at resting potential. Why don't negative ions exit from the cell to normalize charge across the membrane?
A. All of the chloride ions are already outside the cell. B. The negative charge inside the cell is carried by large proteins that cannot diffuse through the membrane. C. There are no negative ions inside the cell. D. The positive charge outside the cell repels negative ions.