Biology 1 Winter 2001 (all sections)

 

Problem Set 1

Problem Set 2

Take-Home Problem Set 1 (due 1/23/01)

 

This assignment is due Tues 23rd January in class. Your answers for each question should be no longer than a few paragraphs. Be succinct!

 

1. Research viruses in your textbook (ch.29, pp.575-578). In a paragraph, discuss arguments for and against the idea that viruses are alive.

2. Based on the recent class discussions and reserve readings, which hypothesis of the origin of life do you feel has the greatest merit? State reasons why you advocate this hypothesis.

3. "Form equals Function" is a fundamental principle in biology. In the case of biomolecules, describe how polarity/nonpolarity accounts for

a) the 3-dimensional structure of a protein

b) presence of proteins in the plasma membrane

c) chemical message recognition by membrane proteins (this last part will require some speculation and perhaps advanced reading).

4. Why are fats good long-term energy storage compounds?

5. In a paragraph, describe the origin of eukaryotic cells using the terms: endosymbiosis, membranes, compartmentalization, and prokaryotes.

 

 

Take-Home Problem Set 2 (due 2/06/01)

 

This assignment is due Tues 6th February in class. Your answers for each question should be no longer than a few paragraphs. Be succinct!

 

1. Compare and contrast chemiosmosis in chloroplasts and mitochondria.

 

2. Compare and contrast cyclic vs. non-cyclic photophosphorylation.

 

3. Why and how does the electron transport chain produce significantly more ATP than glycolysis or the Krebs Cycle?

 

4. It is well established that animals with high numbers of mitochondria also tend to generate high amounts of metabolic heat. Explain why this occurs with respect to the Laws of Thermodynamics, and the maximal efficiency of cellular respiration.

 

5. (hint: you will need to research this question in your textbook). Plants that live in arid environments must conserve water. With the use of diagrams, describe two strategies that have evolved that allow these plants to efficiently fix carbon while minimizing water loss through stomata.