Subject: Why an how do certain pH ranges affect the beetroot cell membrane?

Whe you cut up the beetroot, an dput the pieces in different pH solutions (such 
as pH1, 2, 3, 7, 11, 12, and 13), the colour intensity changes, and the 
question is how does pH affect the cell membrane, what bonds are broken and 
created in the proteins? And also the beetroot turns yellow after staying in    
pH 13 solution, why does that happen?

Re: Why an how do certain pH ranges affect the beetroot cell membrane?