Question

which of the following act as transporters for nutrients to cross the plasma membrane?
fimbriae
phospholipids
integral proteins
peripheral proteins

Explanation:

• Fimbriae are used for cell adhesion, not nutrient transport.
• Phospholipids form the plasma membrane bilayer, only allow small nonpolar substances to diffuse passively, not act as transporters for most nutrients.
• Integral proteins span the entire plasma membrane; many function as transporters (channels or carriers) to move nutrients across the membrane.
• Peripheral proteins are attached to the membrane surface and do not participate in nutrient transport across the membrane.

Answer:

C. Integral proteins