The diagram below shows a simplified section of an animal cell membrane.
Which row in the table correctly identifies the chemical nature and primary functional role of components X and Z?
| Component X (Chemical nature & function) | Component Z (Chemical nature & function) | |
|---|---|---|
| A | Polar glycoprotein; acts as a receptor for hormones | Extrinsic protein; acts as a membrane-bound enzyme |
| B | Hydrophobic steroid lipid; regulates membrane fluidity | Intrinsic protein; forms a hydrophilic pathway for polar substances |
| C | Hydrophobic glycolipid; regulates membrane fluidity | Extrinsic protein; actively pumps ions against a concentration gradient |
| D | Polar triglyceride; acts as an energy store within the bilayer | Intrinsic protein; forms a hydrophobic channel for non-polar molecules |
Row A
Row B
Row C
Row D