1. A scientist investigating the cell membrane concludes that a particular substance is transported
by active transport. Which observation would support this conclusion?
The substance moves along the concentration gradient toward a region of lower
concentration
O B. The transport of the substance into the cell is reduced or reversed in the absence of ATP.
The direction of transport changes when the external solution is changed from a
hypertonic solution to a hypotonic solution.
Transport proteins embedded in the plasma membrane assist in the transport of the
substance into the cell.
O
What’s the answer