If you chew on a piece of bread long enough, it will begin to taste sweet because... A) pepsin is breaking proteins into smaller fragments. B) microvilli in the tongue are releasing sugars into the oral cavity. C) pancreatic enzymes are releasing insulin. D) amylase is breaking down starch to disaccharides. E) peristalsis is occurring.

Expert Answers

An illustration of the letter 'A' in a speech bubbles

The correct answer here is D.  Starches are complex carbohydrates that are made up of multiple sugars.  Amylase breaks down the carbohydrates into their constituent sugars which are naturally sweet tasting.  A is factually correct but proteins break down into amino acids which are not sweet.  B is incorrect (natural sugar in your mouth would be bad for teeth).  C is factually correct but you would not taste any of it in your mouth.  Finally, peristalsis in E involves muscle contractions to move food through the esophagus and has nothing to do with taste.

Approved by eNotes Editorial Team

Posted on

Soaring plane image

We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

  • 30,000+ book summaries
  • 20% study tools discount
  • Ad-free content
  • PDF downloads
  • 300,000+ answers
  • 5-star customer support
Start your 48-Hour Free Trial