Download Oct 31: Biology Homework

Biology Homework: October 31, 2016
Read in Textbook Chapter 6 Section 1 The Flow of Energy
Pages 142 to 151
Answer the following questions from page 164 (questions 1, 2, 3, 4 & 5)
1. Explain why biological reactions that are exergonic require an enzyme only, but endergonic
reactions require an enzyme and ATP?
2. Compare the relative potential energies of reactants and products in endergonic reactions with
those in exergonic reactions.
3. An ATP molecule is used in the first step of cellular respiration, producing a molecule of glucose
phosphate and a molecule of ADP. Is this process exergonic or endergonic? How do you know?
Which has higher potential energy, glucose or glucose phosphate?
4. Why do you think that ATP is referred to as the “energy currency of living organism?
5. Tell what happens in the ATP-ADP cycle.