DP Biology (first assessment 2025)
Question 20N.2.SL.TZ0.2a.i
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.2.SL.TZ0.2a.i |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Outline | Question number | a.i | Adapted from | N/A |
a.i.
[Maximum mark: 2]
20N.2.SL.TZ0.2a.i
(a.i)
Outline how the amphipathic properties of phospholipids play a role in membrane structure.
[2]
Markscheme
a. part hydrophobic/not attracted to water/non-polar AND part hydrophilic/attracted to water/polar;
b. bilayer formed (formed naturally by phospholipids in water);
c. hydrophilic heads/parts face outwards and hydrophobic tails/parts face inwards.
Do not allow water loving/hating in mpa or mpc.
Examiners report
Knowledge of the amphipathic properties of phospholipids was generally good.
