Topic Guide #11: How Does Life Use Energy?

 

Inquiry in the Natural World – Spring 2003

 

Topic objectives: Understand and be able to explain …

 

1… early and current concepts of a) food assimilation; and b) food “combustion” in cellular respiration.

2… Galen’s model of blood formation and movement, how it was revised by Harvey , and the modern conception of the functions of blood circulation.

3… ways in which cellular respiration is like combustion, and ways in which it is different.

4… the nature of “cell work,” and how the laws of thermodynamics help us understand the relationships between cell work, ATP, cellular respiration, and photosynthesis.

5… the general features of metabolic pathways followed when glucose is used in cellular respiration.

6… the relationships between photosynthesis and cellular respiration.

 

Day 2 reading assignment (Monday, 7 April)

 

- Benington, J., How Does Life Use Energy?

 

Questions for discussion:

 

1.   How was Harvey’s theory of blood circulation fundamentally different from Galen’s ideas about blood formation and movement?  What did Galen consider to be the function of the blood, and what do we now consider to be its functions?

2.  What is “digestion”?  What are the two main fates of the products of digestion?

3.  In what ways are combustion and cellular respiration alike?   In what ways are they different? 

 

Day 3 reading assignment (Wednesday, 9 April)

 

- Trefil and Hazen, The Sciences, 3rd edition, chapter 22, pp. 497 - 501.

- Campbell, Mitchell & Reece, 1997, Biology: Concepts and Connections, Chapter 5 – The Working Cell.

 

Questions for discussion:

 

1.   What does the term “cell work” mean? What are three important forms of cell work? What substances directly and indirectly supply the energy needed for cell work?

2.   What are the three stages of metabolism of glucose during cellular respiration? In what part of the animal cell does each occur? In what part of the plant cell does each occur?

3.   Which products of plant photosynthesis are used by animals? Which products of animal cellular respiration are used by plants?

4.   Diagram the general path of energy from the sun through plants to use by animals.  Where does this energy ultimately end up?

 

 

NOTES:

 

Exam 3:  Monday, 14 April (Topics 8-11; 100 pts)

Final Exam:  3:45PM Sat. 5 May; Murphy Aud. (Topics 12 & 13 - 50 pts; Comprehensive - 75 pts)

CLARE 102 Web page: http://web.sbu.edu/physics/faculty/dimattio/Clare102/physics.dimattio-sp03.htm