AP Biology Assignments:
Routine homework requirements:
(Routine homework is 10% of the quarter grade. Graded assignments will become part of the other 90%.)
Answer each question on lined paper, no frizzies. Do not rewrite the question, but staple the question sheet
behind your answers.
Turn in to my Inbox on the front desk.
Write your name, the date you turn it in (honor system) and the period of your class at the top. Each day
late is penalized 10 pts. If you are out of school, it can be submitted via e-mail.
Read Chapter 9 in Campbell & Reece. Answer the following questions.
Glycolysis & Krebs Cycle HW
1. Contrast glycolysis with cell respiration, citing such factors as locale, oxygen use,
energy yields, and type of phosphorylation used.
2. Briefly describe the two means by which ADP is phosphorylated.
3. How does glycolysis differ from fermentation?
4. What is the purpose of NAD in glycolysis? Why must it be constantly recycled?
5. Suggest a reason for the phosphorylation of glucose at the start of glycolysis.
6. How many energy-consuming steps occur in glycolysis? Energy-yielding steps? What
is the net gain in ATP?
7. What does an organism gain by the reduction of pyruvate in the fermentation
reactions?
8. Briefly describe the chemical steps in the alcohol fermentation of pyruvate.
9. Describe what is meant by the term facultative anaerobe and cite an example.
10. Explain the chemical steps leading from pyruvate to lactic acid.
11. Explain how an "oxygen debt" arises and how it is paid off.
12. Summarize the reactions which occur to allow pyruvate to enter the Krebs cycle.
13. What is the overall purpose of the citric acid cycle (Krebs cycle)
14. What is the total yield of NADH? FADH2?
15. How much ATP is generated by the cycle?