Photosynthesis is a process that synthesizes organic molecules (carbon containing molecules). Fill in the blanks below using the following terms: chlorophyll, water, carbon dioxide, light. In photosynthesis, ________________________ is the energy source. In photosynthesis, ________________________ is the carbon source. In photosynthesis, ________________________ is the electron donor. In photosynthesis, ________________________ absorbs light energy. Why do you think photosynthesis is considered one of the most important metabolic pathways on earth? Look at the chemical equations that summarize photosynthesis and aerobic cellular respiration. What is the connection between these two metabolic processes? What do aerobic cellular respiration and fermentation have in common?

Human Anatomy & Physiology (11th Edition)
11th Edition
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Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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  1. While glucose is used as fuel to produce ATP in aerobic cellular respiration, other types of food molecules can also be used. Figure 5.5 provides an overview of how other molecules can be utilized in aerobic cellular respiration. Fill in boxes 1-3 with the appropriate type of food molecule that can be used in this process.

Write what you wrote in boxes 1-3 in Figure 5.5 below.

1

2

3

  1. Referring to Figure 5.5, you can see that NH3 is removed from the amino acids. What waste product do animals produce using this ammonia? Name a waste product that comes out of animals that is made of ammonia.
  2. Procedure 5.3 Fermentation. Read Procedure 5.3. Answer these questions. You may need to review fermentation using your lecture materials and/or your textbook.

Questions

  1. Name one advantage and one disadvantage of fermentation when compared to aerobic cellular respiration.
  • advantage:
  • disadvantage:
  1. In what step of the process of fermentation is ATP produced? + Regeneration
  1. Besides glycolysis, what other process occurs in fermentation and why is it important?
  2. What types of organisms can perform alcoholic fermentation?
  3. What type of fermentation can your muscle cells perform?

 

Read about the experiment on fermentation. This experiment tests the ability of yeast to ferment a variety of different sugars. The results for this experiment are shown in Table 5.2 below.

Table 5.2: Contents of test tubes and changes in air space after one hour.

Tube

Sugar

Yeast Solution

Water

Initial Air Space (cm)

Final Air Space (cm)

Change in Air Space (cm)

1

Glucose (4 mL)

5 mL

0

0.7

3.2

 

2

Glucose (4 mL)

0

5 mL

1

1

 

3

Sucrose (4 mL)

5 mL

0

0.8

2.8

 

4

Fructose (4 mL)

5 mL

0

0.8

2.9

 

5

Maltose (4 mL)

5 mL

0

1

2.5

 

6

Lactose (4 mL)

5 mL

0

0.7

0.9

 

 

Fill in the last column of Table 5.2. using this formula: Final Air Space – Initial Air Space = Change in Air Space.

Answer the questions below.

Questions

  1. What gas causes the change in air space in this experiment?
  2. Which test tube was the negative control in this experiment?
  • Why was it included?
  1. In the test tubes with yeast, were all of the sugars fermented?
  2. Which sugar was fermented most rapidly by the yeast (as shown by the greatest change in air space)?
  3. What can you conclude from this experiment?
  1. Answer the post-lab questions.

 

POST-LAB QUESTIONS

  1. Photosynthesis is a process that synthesizes organic molecules (carbon containing molecules). Fill in the blanks below using the following terms: chlorophyll, water, carbon dioxide, light.

In photosynthesis, ________________________ is the energy source.

In photosynthesis, ________________________ is the carbon source.

In photosynthesis, ________________________ is the electron donor.

In photosynthesis, ________________________ absorbs light energy.

  1. Why do you think photosynthesis is considered one of the most important metabolic pathways on earth? Look at the chemical equations that summarize photosynthesis and aerobic cellular respiration. What is the connection between these two metabolic processes?
  2. What do aerobic cellular respiration and fermentation have in common?
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