Biology 1009 - Lab - Rebecca Teed
Respiration - Study Sheet
C6H12O6 + 6 O2 -> 6 C02 + 6 H20
Two differences between aerobic respiration and anaerobic
respiration (fermentation):
- Aerobic respiration requires oxygen. This is not always plentiful
in certain aquatic habitats (lake bottoms, wetland sediments, the
abyssal plain of the ocean, etc.).
- Aerobic respiration is about six times more efficient than
fermentation.
You observed the result of alcohol-producing fermentation in yeast.
The highest rate of fermentation occurred at 40 degrees C. Why?
For aerobic respiration: take a good look at the graphs on pp. 90 and
91. For poikilotherms, body temperature and respiration rate
increase with the environmental temperature as long as it's between
0 degrees and 35 degrees C. For homeotherms, on the other hand, body
temperature is constant the as long as the environmental
temperature is between 0 degrees and 35 degrees C, and the respiration rate
decreases as the environmental temperature increases in that range.
Homeotherms are able to maintain their bodies (and the component
cells thereof) at an optimal temperature for enzyme-catalyzed
reaction rates. But, homeotherms require 10x to 30x as much food
and oxygen as poikilotherms.
Respiration is the process that enables organisms to release the
chemical energy that is stored in food so that they can use it. What
is breathing and how does it relate to respiration?
This study sheet brought to you by the objectives on page 74.
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