Which of the following describes how phospholipids are positioned in the double layer cell membrane?

Question

a
hydrophobic fatty acid tails face inside and outside the cell
b
the phospholipids lie end to end phosphate head to fatty acid tail
c
hydrophobic phosphate heads face into each other inside the cell membrane
d
hydrophilic phosphate heads face inside and outside the cell

Answer 1

The correct option that describes how phospholipids are positioned in the double layer cell membrane is:

d. hydrophilic phosphate heads face inside and outside the cell

In a phospholipid bilayer, the hydrophilic ("water-attracting") phosphate heads face the aqueous environments inside and outside the cell, while the hydrophobic ("water-repelling") fatty acid tails face each other, forming the interior of the membrane.