You have opened a bakery selling bread. Unfortunately most people find the bread too heavy. Using what you know about chemical reactions (Ch 2).

1 Make a list of factors that might affect the enzyme catalyzed fermentation process.

2 Predict how each factor will affect the rate of fermentation.

3 Propose a solution to making the break light by adding more bubbles to your bread recipe.

CH 9 CELLULAR RESPIRATION AND FERMENTATION

9.3 Fermentation

Fermentation

Process of releasing energy from food in the absence of oxygen.

Fermentation

NADH is converted back to NAD+

Allows glycolysis to continue producing ATP.

Alcoholic Fermentation

Pyruvic acid + NADH Alcohol + CO2 + NAD+

Yeast and other microorganisms Produces alcoholic beverages and causes bread

dough to rise.

Lactic Acid Fermentation

Pyruvic acid + NADH Lactic acid + NAD+

Humans and most organisms.

Quick Energy

Cells have enough ATP for a few seconds of intense activity

Lactic acid fermentation can supply enough ATP to last about 90 seconds

Extra oxygen is required to get rid of the lactic acid produced.

Long-Term Energy

Cellular respiration is required to continue production of ATP for exercise longer than 90 seconds

Body uses glycogen stores for the first 15-20 minutes

Body then will break down other stored molecules, including fats.

How does exercise affect cellular respiration

1. Label two teat tube A and B. Put 10 mL of water and a few drops of bromthymol blue solution in each test tube. CO2 will turn it yellow or green.

2. Your partner will time you. When your partner says go, slowly blow air through the straw into the bottom of test tube A.

3. When the solution changes color, your partner will say stop and then record how long the color change took.

How does exercise affect cellular respiration

4. Jog in place for 2 minutes. Caution do not do this if you have a medical condition that would interfere.

5. Repeat steps 2 and 3 using test tube B6. Trade Roles with your partner and repeat steps

1-5.

How does exercise affect cellular respiration

1. Analyze Data how did exercise affect the time it took the solution to change color?

2. Infer What process in your body produces carbon dioxide? How does exercise affect this process?