Do bananas turn brown if put in jello?

Bananas will indeed turn brown if they are put in jello. This is because the gelatin in jello is an enzyme that causes the bananas to oxidize, which is what turns them brown. The best way to prevent this from happening is to add a little bit of lemon juice or pineapple juice to the jello before adding the bananas. This will help to slow down the oxidation process and keep the bananas from turning brown.