Voltage-gated (voltage-dependent) channels and antiport carriers are both types of transporters. Thus, option (d) is correct.
What is Voltage-gated?
The term voltage-gated refers to the allowing or blocking of passage through a cell membrane in response to an electrical input.
Voltage-gated ion channels are membrane proteins that allow certain inorganic ions to cross cell membranes. An antiporter is a membrane protein that simultaneously transports two molecules in opposite directions.
As a result, both are the type of the transporters. Therefore, option (d) is correct.
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Your question is incomplete, but most probably the full question was
A) receptors.
B) structural proteins.
C) enzymes.
D) transporters.
