Warm-Up (9/8) A. B. Name Date Period On the piece of white paper from the back, answer the following question. Name Date Period An exergonic reaction is one in which products require less free energy to form than the reactants, and energy is thus released. An endergonic reaction is the opposite: energy is absorbed because the products required more energy to form than the reactants. Based on the free energy diagrams below, draw a curve representing the reaction catalyzed by an enzyme, and label each diagram as either exergonic or endergonic. A. B.

Class Web Site Go to: https://edgewoodisd.edmodo.com Select “STUDENTS” Make an account with a username and password and type in group code: q2fvuc Go to the “AP Biology” group and see what I’ve posted!

Biomolecules and Enzymes Fleenor, tell the students about: Caramelizing onions Ripening Fruit Enzymes in spit

Enzymes Cofactor/coenzyme – AKA allosteric activator Coenzymes – big molecules (organic, has C) Cofactors – small ions (inorganic, no C) NAD NaCl

Enzymes What kind of biomolecule does this look like? NAD NaCl

Question! Describe how salt affects an enzyme’s function. Be sure to include where the NaCl ions bind! NaCl

Water Turn to p. 51 δ+: “partial” positive δ–: “partial” negative

Water Hydrogen bond – weak association between δ+ hydrogen and δ– oxygen δ+: “partial” positive δ–: “partial” negative

Why does “polar like polar?” Question! Why does “polar like polar?”

Transpiration p. 775 Water “climbs” up the stem via cohesion and adhesion. How does that work?

It sucks to be a plant transpiration – leaf opens up pores to get CO2 and H2O evaporates

Our Transpiration Experiment What kind of biomolecule is wax made of? What is the relationship between lipids and water? Which plant do you predict will lose less water? Why?

Closure (9/8) Homework! (9/8) Describe a hydrogen bond, and explain how hydrogen bonding aids in the transport of water up a plant’s stem. What role does transpiration (water loss) play in this process? Homework! (9/8) Watch this video and take notes: “YouTube Bozeman Plant Nutrition and Transport”