Question

question 1
describe the difference between a chemical and an electrical gradient.
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question 2
whats an electrochemical gradient?
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question 3
do you think an electrochemical gradient can have conflicting component gradients? (that is, a chemical gradient directing solute flow in one direction, and an electrical gradient directing solute flow in the opposing direction.)

Explanation:

Question 1: A chemical gradient is based on differences in solute concentration across a membrane. An electrical gradient is due to differences in charge distribution across a membrane.
Question 2: An electrochemical gradient is the combined effect of a chemical concentration gradient and an electrical potential gradient for an ion across a membrane. It drives the movement of ions.
Question 3: Yes, an electrochemical gradient can have conflicting component gradients. For example, in some cells, the chemical gradient may want to move a positively - charged ion into the cell (higher concentration outside), while the electrical gradient (more positive charge inside) may oppose this movement.

Answer:

Question 1: A chemical gradient is a concentration - based difference, while an electrical gradient is a charge - based difference across a membrane.
Question 2: It is the combined chemical and electrical potential gradient for an ion across a membrane that drives ion movement.
Question 3: Yes.