Question

which of the following are functions of proteins?
select all that apply
a transport items in and out of cells
b help cells keep their shape
c speed up chemical reactions

Explanation:

• Option a: Transport proteins (like channel or carrier proteins) facilitate the movement of substances across cell membranes, so this is a function of proteins.
• Option b: Structural proteins (e.g., actin, tubulin) provide support and help maintain the shape of cells.
• Option c: Enzymes (which are proteins) act as biological catalysts to speed up chemical reactions in cells.

Answer:

a. transport items in and out of cells, b. help cells keep their shape, c. speed up chemical reactions