The sodium-potassium pump forces sodium ions ___ the cell and potassium ions___ the cell.
A) into, into
B) into, out of
C) out of; out of
D) out of, into
Question 2
One parent can produce about ___ different combinations of chromosomes, and the two together can produce about ___.
a. 8 million, 60 to 70 trillion
b. 100 million, 250 trillion
c. 2 billion, 750 trillion
d. 1 million, 6 trillion
