Which of the following statements about the Na+-K+ ATPase pump is false?
A. It transports Na+ out of cells and K+ into cells.
B. It binds to, and hydrolyzes, ATP.
C. It is constantly active in all cells.
D. Its activity requires the expenditure of metabolic energy.
E. It transports Na+ and K+ in a 1:1 ratio.
E
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The molecular formula of chlorine gas is Cl2. One molecule of this gas would be attracted to another by
A. polar covalent bonds.?B. van der Waals forces.?C. ionic bonds.?D. hydrogen bonds.?E. intramolecular forces.
What type of substance should be used when rinsing slides during a gram stain?
What will be an ideal response?
Lymph movement is assisted by
A. contraction of skeletal muscle. B. pressure changes in the thorax during respiration. C. compression of lymphatic vessels. D. contraction of smooth muscle in lymph vessel. E. All of the choices are correct.
Which of the following is not secreted by the adrenal medulla in response to sympathetic stimulation?
A. Dopamine B. Epinephrine C. Acetylcholine D. Norepinephrine E. All of the choices are secreted in response to sympathetic stimulation.