Question 12
The diagram illustrates the use of energy by a nerve cell to expel a sodium ion from inside of the cell.
Outside of Cell
Cell
Membrane
Transport
Protein
H
WW
soon
Energy
Inside of Cell
Which BEST explains why energy is necessary to complete this function?

The ion is being transported against a concentration gradient.

Explanation: this is why energy is necessary

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.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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