Cellular Energetics Group Review
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Explain the consequences of the first and second laws of thermodynamics for living systems.
Compare exergonic and endergonic processes. Provide examples of each.
Compare anabolic and catabolic processes. Provide examples of each.
Describe the role of ATP in coupling the cell’s anabolic and catabolic processes.
How are organic molecules broken down by catabolic pathways?
What is the role of oxygen in energy-yielding pathways?
How do cells generate ATP in the absence of oxygen?
How does photosynthesis convert light energy into chemical energy?
Identify the coupling of exergonic and endergonic reactions in photosynthesis and respiration.
How are the chemical products of the light-trapping reactions coupled to the synthesis of
carbohydrates?
Explain the relationship between photosynthesis and respiration in ecosystems.
Explain how energetic requirements (autotroph, heterotrophs, high metabolism, low
metabolim, endotherm, ectotherm) contribute to the adaptations of organisms.
Compare chemiosmosis in aerobic cellular respiration and photosynthesis.
How was photosynthetic rate measured in the photosynthesis lab?
What was the IV in the photosynthesis lab? DV? Control? Controlled variables?
How was respiration rate measured in respiration lab?
What was the IV in the lab? DV? Control? Controlled variables?
Explain how primary productivity is the ultimate determinant of the structure of a community.
A reptile and a mammal are put in separate containers to measure respiration rate. The
temperature of the containers is kept at 10 degrees Celsius. What results would you expect and
why?
Yeast cells are placed in an apparatus with a solution of sugar (a major nutrient for yeast
metabolism). The apparatus detects bubbles of gas released by the yeast cells. The rate of
respiration varies with the surrounding temperatures as indicated by the data below:
Temperature
(Celsius)
Number of
gas bubbles
produced
per minute
0
10
20
30
40
50
60
70
0
3
7
12
7
4
1
0
a. Calculate the most optimum respiration rate.
b. Why does the respiration rate decline?