HL 1 Biology

8.1b Aerobic Respiration

<<Structure-Fuction Relationships in Mitochondria>>

Relationships between structure of the parts of organisms and their functions, explained through natural selection and evolution.

Organisms with mitochondria that produced ATP most efficiently  would have an advantage

  • Structure to help efficient production of ATP
      • many cristae
      • small space between inner and outer membrane
      • matrix with decarboxylases and dehydrogenases
  • Efficient production of ATP results with:
      • increased chance of survival
      • tend to produce more offsprings
      • offsprings inherits mitochondria with efficient production of ATP

Adaptation: a change in structure so that something carries out its function more efficiently

  • If trend of offsprings inheriting the mitochondria which efficiently produces ATP keeps continuing; mitochondria structure would evolve to become more efficient over time

Electron Tomography: allows 3-D images of interior of mitochondria

==================Chapter 8 Questions====================

Chapter 8 Questions (p.100)

2) (a) The respiration rate in yellow-billed magpies shows a decline in relation to the increasing external temperature from -10 to 12˙C. Between the change in temperature through 12 to 32˙C, there seems to be no effect on the respiration rate as it stays constant. The respiration rate presented a sharp increase as the temperature increased through 32 to 40˙C.

(b) As the temperature decreases from +10˙C to -10˙C there was a change in respiration rate as the bird may be working to maintain a constant, homeostasis temperature. In order to maintain the temperature, the bird may increase in their motion and action. The respiration produces waste heat and increases metabolic rate, and its core temperature.

(c) As temperature increased from 30˙C to 40˙C, the respiration rate increases in order to help cool the core temperature inside the bird’s body. The cooling of the core temperature, during the increase in the external temperature can be processed through evaporative cooling as the respiration rate increases.

(d) The variation in respiration rate between the birds at each temperature are through the random errors. The sample of birds in varied surface areas had an effect on the core temperature and the exact temperature changes.

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