Sugars and amino acids move into the cell by means of
A)facilitated transport.
B)active transport.
C)simple diffusion.
D)endocytosis.

Question

Quizplus · Accepted Answer

Sugars and amino acids are polar molecules and cannot freely diffuse across the cell membrane. They require the assistance of specific carrier proteins to move into the cell by facilitated transport. This process does not require energy expenditure. Active transport requires energy expenditure and moves molecules against a concentration gradient, and simple diffusion moves molecules down a concentration gradient but does not require assistance from carrier proteins. Endocytosis is a process by which large molecules or particles are brought into the cell by invagination of the cell membrane, and is not specific to sugars and amino acids.

Sugars and Amino Acids Move into the Cell by Means