Question

what makes phospholipids suitable for forming cellular membranes? they have both hydrophobic and hydrophilic parts; they are soluble in water; they are completely hydrophilic; they are completely hydrophobic

Explanation:

Phospholipids have a hydrophilic (water - attracting) head and hydrophobic (water - repelling) tails. Cellular membranes are in an aqueous environment (both inside and outside the cell). The hydrophilic heads interact with water, and the hydrophobic tails cluster together away from water, which allows them to form a bilayer structure suitable for cellular membranes. Option 2 is wrong because phospholipids aren't just soluble in water (they have a hydrophobic part). Option 3 is wrong as they aren't completely hydrophilic (they have a hydrophobic part). Option 4 is wrong as they aren't completely hydrophobic (they have a hydrophilic part).

Answer:

A. They have both hydrophobic and hydrophilic parts