Question

In active transport, carrier proteins are used, which use energy in the form of ATP, to

• A. Transport molecules against concentration gradient of cell wall
• B. Transport molecules along concentration gradient of cell membrane
• C. Transport molecules against concentration gradient of cell membrane
• D. Transport molecules along concentration gradient of cell wall

Answer 1

Answer: (C)

Transport molecules against concentration gradient of cell membrane

In active transport, carrier proteins which are located at membrane, use energy in the form of ATP to transport molecules against concentration gradient of cell membrane. Transportation rate reaches maximum when all carrier proteins are being used or are saturated. These proteins are very specific to certain substances and are sensitive to inhibitors.
So, the correct answer is option C.