Question

Active transport is characterized by

• A. the requirement of special proteins
• B. being highly selective of the molecules transported
• C. the expenditure of ATP
• D. all of the above

Answer 1

The correct option is D all of the above

Active transport involves the expenditure of energy in the form of ATP as the movement of molecules is against the concentration gradient (from low to high concentration) and with the help of special proteins called carrier proteins. Highly selective transporters are present in the membrane that cause movement of selective molecules against the concentration gradient.