Define the following terms:
$(1)$ Antiport
$(2)$ Active transport

(N/A) $(1)$ Antiport: In this type of transport,two different molecules move across the membrane in opposite directions.
$(2)$ Active transport: This is the movement of molecules across a membrane against the concentration gradient (from lower concentration to higher concentration). This process requires carrier proteins and the expenditure of metabolic energy in the form of $ATP$.