HW - 4/24/12

Tonight's homework is to complete Classwork 99.

Answer each of the following questions to the best of your ability in complete sentences on another sheet of paper.

1. Think about what you have learned over the last two days. Why do you need to breathe in oxygen? Be thorough, use details, and include vocabulary terms.

2. Describe the journey that a molecule of glucose must undergo as it is broken down to release energy in your cell. Start at the point when glucose enters the cell and describe the major steps that take place during respiration as well as where they occur in the cell.

3. What is the advantage of aerobic respiration over anaerobic respiration?

4. The end products of cellular respiration are CO₂ and H₂O. Where do the oxygen atoms in the CO₂ come from? Where does the oxygen atom in H₂O come from?

Questions 5 through 7 refer to the graphs and explanation below.

Infection by viruses can significantly affect cellular respiration and the ability of cells to produce ATP.  To test the effect of viral infection on the stages of cellular respiration, cells were infected with a virus, and the amount of lactic acid and ATP produced were measured.

Data & Observations

5. How did the virus affect lactic acid production in the cells? State your evidence.

6. After 8 hours, how much higher was the lactic acid higher in the virus group than in the control group?  How much has ATP production decreased?

7. Why might having a virus like the flu make a person feel tired?