Depolarization of the plasma membrane, regardless of the cause of the depolarization, causes
A) voltage-gated K+ ion channels to close.
B) voltage-gated Na+ ion channels to open.
C) ligand-gated Ca2+ ion channels to open.
D) ligand-gated Cl- ion channels to open.
E) both A and B
Answer: B) voltage-gated Na+ ion channels to open.
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In the process of ________________________________________, dairy animals give birth
Fill in the blank(s) with correct word
Enamel is found in the crown of a tooth, whereas dentin is part of both the crown and the root.
Answer the following statement true (T) or false (F)
Consider the two chemical reactions. Identify each statement following as true or false, and clarify as needed.
A +B ?C C ?A +B A. The enzyme catalyzing the formation of C must be different from that catalyzing the breakdown of C. B. The enzyme catalyzing the formation of C must be the same as that catalyzing the breakdown of C. C. Only one of the reactions could occur in a given cell or system. D. Both reactions must be occurring in an equilibrium situation. E. Equilibrium is always achieved in a chemical reaction. F. Equilibrium can be prevented from occurring by constantly removing the product of either reaction. G. An equilibrium, once established, cannot be disturbed.
It takes about _______ for an epithelial cell to migrate from the base of the villi to the tip
a. three hours b. three days c. one day d. three months e. several weeks