Unit 2: Chemistry & Macromolecules

Question 1

activation energy

Answer 1

energy needed to start the reaction

Question 2

Why do all reactions require an input of energy?

Answer 2

• overcome repulsion forces in order to push atoms together
• energy is needed to break bonds

Question 3

cohesion vs adhesion

Answer 3

cohesion: attraction of molecules of same substance
adhesion: attraction between molecules of different substances

Question 4

describe bicarbonate buffer system in humans

Answer 4

1. increased levels of H ions in blood lower pH (this can come from break down of fat in lipolysis)
2. bicarbonate (HCO2-) acts as base and accepts these ions to form carbonic acid and raise pH
3. carbonic acid becomes CO2 and H2O which are released in exhalation

Question 5

The monomer of Protein?

Answer 5

amino acids