Aim: How are organic
molecules formed, and how
are they broken down again?
Do Now: Please fill in this chart. Try
to do it without looking at your notes.
Notes in blue.
Some Vocabulary
• Monomer: Any of the subunits
that make up organic molecules.
• Polymer: Any of the four
organic molecules we’ve talked
about.
• Peptide Bond: The bond that
connects amino acids in a
protein.
Dehydration
synthesis:
• De = un, to remove
• Hydra = water
• Synthesis = to make
Dehydration Synthesis
• Is a chemical reaction in which
water is removed from two
molecules to join them together by
a chemical bond.
• Two subunits (monomers) combine
to become an organic molecule
(polymer).
• WATER (H2O) is the BYPRODUCT.
Dehydration Synthesis of Carbs
Dehydration Synthesis of Proteins
Hydrolysis:
• Hydro = water
• Lysis = to split apart
Hydrolysis
• Is a chemical reaction in which a
larger molecule is split apart into
two smaller molecules by the
addition of water.
• A complex molecule (polymer)
becomes two simple molecules
(monomers)
• WHAT DO YOU NOTICE ABOUT
HYDROLYSIS AND
DEHYDRATION SYNTHESIS?
Hydrolysis of carbohydrates
Hydrolysis of Proteins
Let’s Watch it Happen!!
• http://nhscience.lonestar.edu/biol/dehyd
rat/dehydrat.html
• http://www.youtube.com/watch?v=b7Td
WLNhMtM
Wrap Up!

Turn to the chapter 4 word wall on page 137.

Record at least two “new to you” words that we used in class today.