Exam Which material would provide the
MOST resistance for electricity?
A. plastic song
B. copper
C. gold
D. silver

D. this is why but if it's wrong sorry ;)

Some materials are better conductors than others and offer less resistance to the flow of charge. Silver is one of the best conductors but is never used in wires of household circuits due to its cost.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.