Which is true of facilitated transport by carrier proteins?
A) Facilitated transport only applies to small, lipid-soluble molecules.
B) It is represented by the glucose carrier that can transport hundreds of molecules a second.
C) After a carrier has transported a molecule, it is unable to transport any more.
D) Facilitated transport requires expenditure of chemical energy and is therefore active transport.
E) One carrier protein can carry a variety of different molecules.

Question

Quizplus · Accepted Answer

Facilitated transport by carrier proteins does not require expenditure of chemical energy and is therefore passive transport. It can transport larger molecules that are not lipid-soluble, such as glucose, and the carrier can transport multiple molecules before becoming saturated. However, each carrier protein is specific to certain types of molecules and cannot carry a variety of different molecules.

Which Is True of Facilitated Transport by Carrier Proteins