Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
Scientific Frontiers Logo
TV Schedule
Alan Alda
For Educators
Previous Shows
Future Shows
Special Features

Losing It
  Teaching Guide

Activity 1: Grades 9-12
Tasty Models

Image of molecule

Print version (PDF)
Main Menu

Glucose Model

  1. What are common features to all amino acids?
  2. Compare and contrast the composition of an amino acid to a sugar.
    (The "open" bonds from neighboring sugars join together and link the side-by-side sugars into a dissacaride)
  3. From what you can observe in the molecular structure, can dehydration synthesis also produce long chains of amino acids? Explain.
    (Water would cause neighboring sugars to unlink in a reverse reaction to dehydration synthesis)

Saturated and Unsaturated Fats

  1. When saturated, how many different atoms can a carbon bond to?
  2. What must be added to an unsaturated chain, in order to make it saturated?
  3. Infer the structural feature of a "polyunsaturated fat".
    (The fat molecule has more than one double bond in its structure).




© 1990-2004 The Chedd-Angier Production Company, Inc. All rights reserved.

Counting DownDebunking the Low-Fat, No-Fat MythLosing Weight the Surgical WayHeavy Hormones?Weighing In Teaching guide Email scientists Watch Online Web links & more Contact Search Homepage