Question

According to the acid-growth hypothesis, auxin causes increased acidity in cell walls, which then activates ____ that disrupt(s) bonds between cellulose microfibrils, allowing cell expansion

Answer 1

Answer:

proteins called expansins

Explanation:

The complete question is :

According to the acid-growth hypothesis, auxin causes increased acidity in cell walls, which then activates ____ that disrupt(s) bonds between cellulose microfibrils, allowing cell expansion.

a. a membrane potential

b. an mRNA

c. AUX1 transporters

d. K+ ions

e. proteins called expansins

• The acid growth hypothesis explains the growth of cells and organs in the plants.
• According to this hypothesis, the plant hormone auxin causes induction of the H+ proton extrusion into the apoplast which leads to the activation of expansin which a pH-sensitive protein.
• Expansin is responsible for wall stretching and relaxation and causes hydrolysis of hydrogen bonds and thus helps in cell expansion.