Question

In the active transport, carrier proteins utilise energy in the form of ATP, to:

• A. transport molecules against the concentration gradient across the cell wall
• B. transport molecules along the concentration gradient across the cell membrane
• C. transport molecules against the concentration gradient across the cell membrane
• D. transport molecules along the concentration gradient across the cell wall

Answer 1

The correct option is C

transport molecules against the concentration gradient across the cell membrane

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