Bread and Spit - Enzymes Project
Welcome to Quatr.us Study Guides!

Enzymes Project

Slice of bread

You can easily taste how your enzymes work breaking down your food into smaller pieces. Do this experiment right after lunch, when you'll have a lot of enzymes in your saliva. Get a slice of plain bread (a starch) and chew it slowly. Keep chewing for a long time, but don't swallow the bread. What happens to it? (Once you think you know, you can swallow it or spit it out.)

After a while, the bread should begin to taste sweet. The digestive enzymes in your spit will gradually digest the starch in the bread and turn it into smaller sugar (glucose) molecules, that will be easier for your cells to get through the cell membranes to turn into energy. That's why starchy things like bread and noodles and rice and potatoes, and sweet things like chocolate bars, are both carbohydrates - they're both made mainly of carbon and hydrogen atoms, and if you break apart a starch molecule, it turns into sugar molecules.

If you've ever vomited up food, you know what the enzymes in your stomach do - that's the difference between food you chewed up and food that your stomach enzymes have partly digested.

Tell me more about enzymes

Bibliography and further reading about enzymes:

Enzymes
Cells
Biology
Chemistry
Quatr.us Home


Celebrating Black History Month with the pharaoh Hatshepsut, the queen Shanakdakhete, the poet Phillis Wheatley, the medical consultant Onesimus, the freedom fighters Toussaint L'Ouverture, Denmark Vesey, Yaa Asantewaa, and Samora Moises Machel, and the civil rights leader Martin Luther King, Jr.
Please help other teachers and students find us: link to this page from your class page.
Karen Carr is Associate Professor Emerita, Department of History, Portland State University. She holds a doctorate in Classical Art and Archaeology from the University of Michigan. Follow her on Instagram or Twitter.
Cite this page
  • Author: K.E. Carr
  • Title:
  • Site Name: Quatr.us Study Guides
  • Publisher: Quatr.us
  • Date Published:
Proud of your class page, homework page, or resource page? Send it in and win a Quatr.us "Great Page!" award!
Sign up for more free articles and special offers in Quatr.us' weekly newsletter:
We will never share your e-mail address unless you allow us to do so. View our privacy policy. Easy unsubscribe links are provided in every email.
Comment on This Article

Cool stuff we've been enjoying: Looking for birthday gifts? Check out these new Chromebooks - all the computer you need for only $229.00!. Then study in peace with these Beats wireless headphones - for the exact same price! When you're done, show off your presentation or watch a movie with this excellent smartphone projector for only $39.99!


Does your class page honor diversity, celebrate feminism, and support people of color, LBGTQ people, and people with disabilities? Let us know, and we'll send you a Diversity Banner you can proudly display!
Looking for more?
ADVERTISEMENT
Quatr.us is loading comments...
(Comments will appear after moderation, if they are kind and helpful. Feel free to ask questions, and we'll try to answer them.)
Cite this page
  • Carr, K.E. . Quatr.us Study Guides, . Web. 24 February, 2017
ADVERTISEMENT