ATP is the resource by which the cell gets everything done. ATP is spent in a similar way as money is. ATP is used for its energy to help the cell run efficiently. It earns ATP through energy creation, then has to spend it to perform other vital functions.
Answer:
Hi! Before I go tell me what you think of this meme I made:
The cell has to use active transport when it's trying to transport material against the concentration gradient. (from low to high concentration) Or, if a molecule is too big to diffuse through the cell membrane, it must be moved through using a carrier protein.
Hope that helped you.
He should use a filter and then read it using a machine
D = m/V
m = 75g
V = 4 x 4 x 4 = 64 cm^3
d = 75/64 = 1 11/64 g/cm^3