Why does cells need to use transport protein to function?

some important molecules are too large to pass through the cell membrane.

Hope this helps!

-Payshence

this would be a math

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.