During the depolarization phase of an action potential in a neuron
A) K+ ions move from inside to outside the membrane.
B) Na+ ions move from outside to inside the membrane.
C) the Na/K ATPase pumps Na into the cell.
D) K+ and Na+ ions trade places across the membrane.
Ans: B) Na+ ions move from outside to inside the membrane.
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The primary function of the large intestine is ________.
A. mineral absorption B. hormone degradation C. water and electrolyte reabsorption D. degrading toxins
Which of the following is NOT posttranslational processing?
A. conversion of a pro-protein to a functional protein B. conversion of a pro-enzyme to a functional enzyme C. joining 2 or more amino acid chains D. adding polysaccharide side chains to proteins E. removal of introns from pre-mRNA
Paralysis on the right side of the face could result from damage to the right _____ nerve
A. vagus B. facial C. accessory D. trigeminal E. None of these choices is correct.
Some simple columnar and pseudostratified columnar epithelia have ________ cells, which produce a protective mucous coating over the mucous membranes
A) blood B) fibrous C) keratinized D) basal E) goblet