If all the bonds between the glucose polysaccharide of a starch molecule were changed from α−1,4 covalent bonds to β−1,4 covalent bonds, what would be true about the polysaccharide?

A. It would provide more energy for humans because β–1,4 covalent bonds are higher energy bonds.

B. It would be a reduced source of energy for humans because the polysaccharide is now glycogen, which enters the Krebs cycle at a later stage than starch.

C. It would be unusable as an energy source for humans because the polysaccharide is now cellulose, which humans cannot digest.

D. It would provide the same amount of energy for humans because all covalent bonds contain the same amount of energy.

Starch is a polysaccharide carbohydrate that can be digested by the digestive enzymes of humans. Changing the bond from α−1,4 covalent bonds to β−1,4 covalent bonds will leads to formation of cellulose which will be unusable for the humans as it will not get digested.

What is cellulose?

Cellulose is a polysaccharide that is found in the cell wall of plants.

It is consist of glucose molecules that are connected by β−1,4 covalent bonds.

So changing the bond from α−1,4 covalent bonds to β−1,4 covalent bonds will leads to formation of cellulose.

Thus, the correct option is C.

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