Resistance is a measure of how well a material conducts an electric charge. Would you expect to find a high or low, level of resistance in a copper wire and why?
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Resistance is the opposite of that. What you described is conductance.
Resitance is how hard it is to move electrons (current) round something. In air or wood, it is almost impossible, so it has a very high (but not quite infinite- think of sparks in the air) resistance. Through copper on the other hand it is really easy to move electrons through, so what do you think the resistance would be?
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Which answer correctly explains how the ATP molecule differs in function from the ADP molecule?
ATP stores potential energy, while ADP creates immediate energy.
ADP breaks down energy, while ATP builds energy.
ADP represents potential energy, while ATP represents immediate energy.
ATP creates energy bonds, while ADP breaks them apart.
anything for this?
Best post in the biology group in the future, but I'll give it a go.
When enzymes break down glucose into smaller parts, energy is released. How is this energy stored? It would be useless turned into heat energy. So a molecule (called ADP: ----- Di-phosphate ('two-phosphate')) comes along and a specialised enzyme bonds another phosphate on with that energy, making it ATP (T='tri-'='three').
Now, chemical processes, energy-wise, are symmetrical, so we can get as much energy out of ATP by breaking off that third phosphate (and turning ATP into ADP) as the ADP gained when it was turned into ATP.
That's just an example, there are loads of other ways cells can 'attach' energy onto ADP by storing an ATP.
I think the third phospate must be fairly unstable also, so that ATP can be 'activated' to release its energy quickly. ADP's like an unloaded toy gun, and ATP is like a loaded one, where one small click can release all the energy it took to put the bullet in and pull back the mechanism.