Question

6 how do transport proteins move substances across membranes? a they move inside the membrane, carrying the substance b they change shape c they rip open a temporary hole in the membrane d they increase the concentration gradient inside the cell

Explanation:

Transport proteins move substances across membranes by physically moving within the membrane and carrying the substance. They do not increase the concentration gradient (A is wrong), they don't rip open holes in the membrane (C is wrong), and simple shape - change is not their main mode of action for transport (B is wrong).

Answer:

A. They move inside the membrane, carrying the substance