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Mrs. Ruhala set up an experiment where she tested for the presence of monosaccharides in food. She took a cracker and it tested negative for
monosaccharides. Then she put the cracker in her mouth, chewed it up and then spit it out into a test tube. It now tested positive for
monosaccharides.
What happened?
A) The physical action of chewing broke down the lipids in the cracker and producing a positive reaction.

B) Mrs. Ruhala is a magical being

C) An enzyme in her mouth broke down the polysaccharides in the cracker into monosaccharides.

D) Water in the saliva catalyzed the cracker proteins and broke them into monosaccharides.

Answer :

Answer:

Option C) An enzyme in her mouth broke down the polysaccharides in the cracker into monosaccharides.

Explanation:

  • This happened because of saliva present in the mouth.
  • Saliva is a watery substance which is present in our mouth and secreted by salivary glands. Saliva is composed of 98% water and it contains important substances like electrolytes, mucus, antibacterial compounds and various enzymes.
  • The enzyme present in saliva is amylase which helps in  breakdown of some starches(polysaccharide) into maltose(diasaccharide) and dextrin. Which means, digestion of food occurs within the mouth, before the food reaches the stomach.

Result: The result come positive due to the action of saliva on cracker.

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