Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones.Requirements for facilitated diffusion include
A)The carrier molecule must be specific to the molecule that is transported.The direction of movement is always with the concentration gradient,never against the gradient.
B)The carrier molecule is nonspecific to the molecule that is transported.The direction of movement is always with the concentration gradient,never against the gradient.
C)The carrier molecule is nonspecific to the molecule that is transported.The direction of movement is always against the concentration gradient,never with the gradient.
D)The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier.The direction of movement is always against the concentration gradient,never with the gradient.

Question

Quizplus · Accepted Answer

Facilitated diffusion requires a carrier molecule that is specific to the molecule being transported. The direction of movement is always with the concentration gradient, meaning that molecules move from a higher concentration to a lower concentration. There is no requirement for ATP to be attached to the carrier molecule. These are the characteristics described by choice A.

Facilitated Diffusion Is an Important Method for Cells in Obtaining