Chemistry question about Covalent Bonds?

My teacher says one of the questions on the test that has to do w/ covalent bonds will be: "After cooking low heat for several minutes, onions begin to "carmelize". The natural sugars (C6H6O6) break out of the onion cells and the onions begin to taste sweet." If anyone can help, I'd... show more My teacher says one of the questions on the test that has to do w/ covalent bonds will be:
"After cooking low heat for several minutes, onions begin to "carmelize". The natural sugars (C6H6O6) break out of the onion cells and the onions begin to taste sweet."

If anyone can help, I'd appreciate it!
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