AIIMS 2016
- Exam
- AIIMS
- Year
- 2016
- Subject
- Botany
- Chapter
- Cell - The Unit of Life
AIIMS 2016 · Botany · Cell - The Unit of Life
Which one of the following is correct for the transmembrane...
Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?
Options
- AThey are absent in animal cells.
- BThey act as channel proteins.
- CThey are absent in plant cells.
- DThey are only externally located.
Correct answer
B. They act as channel proteins.
Step-by-step solution
The tunnel proteins or transmembrane proteins run throughout the lipid bilayer and individually or in group form channels for the passage of water and water soluble substances. The channels however, possess selective properties for passage of different ions and other polar substances.