Question

Question 2 What are porins? What role do they play in diffusion?

Class XI Biology Chapter - Transport in Plants Page 193

Answer 1

Porins are types of proteins which form pores of large sizes in the outer membranes of plastids such as chloroplast, mitochondria and the membranes in bacteria. They help in facilitating the passive transport of small-sized protein molecules.

Answer 2

Answer:

1. Porins are a kind of protein channels.
2. They form huge pores on the outer membranes of plastids, mitochondria and some some bacteria.
3. They allow small sized protein molecules to diffusion through them.
4. Thus, porins cause facilitated diffusion.