Question

Choose the correct answer from the alternatives given.
In a phospholipid bilayer, the

• A. Phosphate groups are hydrophobic
• B. Fatty acid tails are hydrophilic
• C. Proteins are located only between the two layers
• D. Phosphate heads are oriented towards the exterior of the cell or toward the cytoplasm

Answer 1

The correct option is D Phosphate heads are oriented towards the exterior of the cell or toward the cytoplasm

In the fluid mosaic model, the phospholipid bilayer has integrated as well as peripheral proteins embedded in it. This bilayer is composed of hydrophilic phosphate heads and hydrophobic tails. The phosphate heads are oriented towards the exterior or towards the cytoplasm.

So, the correct answer is 'Phosphate heads are oriented towards the exterior of the cell or toward the cytoplasm'.