Question 6a
Identify the parts labeled A, B, and C in the membrane diagram.
Explanation of Each Part:
This bilayer structure is approximately 7 nm thick and serves as a selective barrier, allowing certain molecules to pass while blocking others.
A – Phospholipid Head
The phospholipid head is the hydrophilic (water-attracting) part of the phospholipid molecule.
It faces outward towards the aqueous environment on either side of the membrane, interacting with water.
B – Phospholipid Tails
The phospholipid tails are hydrophobic (water-repelling) fatty acid chains.
These tails face inward, away from water, and interact with each other within the membrane’s interior.
C – Bilayer Membrane
The bilayer membrane refers to the structure formed by two layers of phospholipids, with hydrophilic heads facing outward and hydrophobic tails facing inward.