13 Jun BIOLOGY 204 Explain how rhodopsin functions as a light receptor
Question
Instructions: Answer each of the questions given below in your own words. Write in complete sentences where appropriate. A complete answer usually requires one to two sentences per mark, so a three-mark question would be answered in three to six sentences. This section is worth a total of 40 marks.
(4 marks) 1. Explain how rhodopsin functions as a light receptor.
(6 marks) 2. Explain the Miller-Urey experiment. What are the implications of this
experiment?
(4 marks) 3. Explain the term RNA world.
(4 marks) 4. What is the relationship between the surface area and volume of
acell? Explain how the two major groups of organisms differ in
this respect, and why.
(6 marks) 5. Draw and label a simple line diagram of a cell membrane. Include the
major types of membrane proteins. On your diagram, also indicate
how the following pass through the cell membrane:
· oxygen gas
· ions
· large volumes of water
(3 marks) 6. What is a proton-motive force, and how is it achieved in cellular
respiration?
(4 marks) 7. Most organisms are aerobic. What is the major advantage of having
an aerobic metabolism? What is a major problem associated with an
aerobic metabolism?
(5 marks) 8. Explain in detail what happens after an electron absorbs light.
(4 marks) 9. Explain the second law of thermodynamics and entropy.
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