IB DP Biology- B1.1 Carbohydrates and lipids IB Style Questions For HL Paper 1A -New Syllabus
▶️ Answer/Explanation
Correct Answer: \( \boxed{\mathbf{B}} \)
A phospholipid is made up of a glycerol backbone, a phosphate group, and two fatty acid tails. These components give the molecule a hydrophilic (water-attracting) head and hydrophobic (water-repelling) tails. Structure B clearly shows this arrangement, making it the correct phospholipid molecule. Phospholipids are the main structural components of the cell membrane, where they form the phospholipid bilayer.
▶️ Answer/Explanation
The molecule in option (A) has both hydrophilic and hydrophobic regions: a polar phosphate head group and nonpolar fatty acid tails. This dual nature makes it amphipathic, like a phospholipid found in cell membranes.
✅ Answer: (A)
✅ Answer: (A)