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Electrical gradients ( potential; charges) exists on cell membranes because in part when the cell is at rest...a.The inner surface surface of the cell membrane is more negatively charged than the outer surface.b. the inner surface of the cell membrane is more positively charged than the outer surface.c. The membrane as a whole is hydrophilic on the outside.d. the membrane as a whole is hydrophobic on the outsidee.None of the above

Question

Electrical gradients ( potential; charges) exists on cell membranes because in part when the cell is at rest...

a.The inner surface surface of the cell membrane is more negatively charged than the outer surface.

b. the inner surface of the cell membrane is more positively charged than the outer surface.

c. The membrane as a whole is hydrophilic on the outside.

d. the membrane as a whole is hydrophobic on the outside

e.None of the above 

check_circleAnswer
Step 1

Membrane potential is the difference in the electric potential (gradient of ion concentrations) across the membrane of a biological cell. When membrane potential changes, it leads to generation of action potential (allows cell to send signals throughout the body).

Step 2

There is a difference in the ion concentration across a cellular membrane even when then cell is at rest. This creates a voltage difference known as membrane potential. At rest, potassium ions (K+) along with some proteins (anions) are in abundance inside the cell giving a net negative charge on the intracellular side of cell membrane. On the extracellular surface, sodium (Na+) and calcium (Cl-) ions are in abundance, giving it a net positive charge. Thus, a membrane potential is generated across the cell membrane even when the cell is at rest.

Step 3

Explanation for correct answer:

Option ‘a’ is correct because negative charge is in abundance on inner surface of cell membrane because of the presence of potassium ions and some large proteins.

Explanation for incorrect answer:

Option ‘b’ is incorrect because outer surface of cell membrane is more positively charged and not inner surface which is instead more negatively charged.

Option ...

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