The nonpolar hydrocarbon tails of phospholipids prevent the movement of ions and polar molecules across the membrane. Small polar, uncharged molecules, like H O2 or NH3 (ammonia), pass through the membrane in small amounts.
Standard detail
2.4.A.3
Depth 3Parent ID: EDE12F213E1E4EFE9B18095219373D21Standard set: AP Biology (2025)
Original statement
Quick facts
- Statement code
- 2.4.A.3
- List ID
- 3
- Standard ID
- 6F669072AF8F4CCFA99BA54EA7B9F113
- Subject
- AP Biology
- Grades
- 09, 10, 11, 12
- Ancestor IDs
- EDE12F213E1E4EFE9B18095219373D219E74095FDD4049F491F4242605D12483E36AEE76A60A48BBB2281778B8E61081
- Source document
- AP® Biology COURSE AND EXAM DESCRIPTION Effective Fall 2025
- License
- CC BY 4.0 US