Which of the following cannot readily cross the blood-brain barrier?
A) Cl-
B) K+
C) Na+
D) all of these
D
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To officially be a hurricane, the disturbance must have rotary circulation and have wind speeds of at least ________ kilometers per hour
A) 161 B) 119 C) 195 D) 92 E) 70
Which of the following occurs when a magnesium atom is converted to Mg2+?
A) The magnesium atom gains two electrons and loses two protons. B) The magnesium atom gains two electrons. C) The magnesium atom loses two electrons and two protons. D) The magnesium atom loses two electrons.
Maps are
A) seldom used by geographers. B) two-dimensional representations of the earth. C) exact replications of features found on the earth. D) designed to show all the information known about a location.
In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn ? Zn+2 + 2e- rxn B: 2 NH4+ + 2e- ? 2 NH3 + H2 Which reaction is taking place at the anode?
A) rxn A B) rxn B C) Both reactions are happening at both the anode and cathode. D) Both reactions are happening at the electrode. E) The reaction takes place at the electrode, not the anode.