IB biology IA respiration

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Background Research Yeast are eukaryotic microorganisms just like other organisms, they must respire in order to survive. Respiration can be defined as the controlled release of energy from organic compounds to form adenosine triphosphate (ATP). The type of respiration that occurs is called aerobic respiration. It occurs when glucose and oxygen are present. It can be summarized by the equation: . Enzymes play a very significant part in respiration. During the different stages of respiration, enzymes that are often found in the matrix of the mitochondria are used to speed up reactions in the body by reducing a reaction’s activation energy, which means that less energy is required to start a reaction. Enzymes need to collide with their…show more content…
Vice versa, if a smaller concentration of yeast was used than what was stated, the time taken for the end point to be reached will be shorter because there are less respiring yeast cells present, increasing the time taken for the TTC to become reduced.
Concentration of glucose solution
Glucose solution should be drawn from a single stock solution to prevent fluctuations in concentrations.
%
If a bigger volume of glucose was measured than what was stated, the time taken for the end point to be reached will be faster than it would be normally, because there are more glucose molecules present, reducing the time taken for the TTC to become reduced. Vice versa, if a smaller volume of glucose was measured than what was stated, the time taken for the end point to be reached will be shorter because there are less glucose molecules present, increasing the time taken for the TTC to become reduced.

Uncontrolled Variable

Uncontrolled variables
Measures to control the uncontrolled variables
Effect on results
Light sensitivity for TTC
Keep the TTC under shade
The solution will not or have a delay when turning pink, thus making the results inaccurate and unreliable
Yeast concentration
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