HL 1 Biology

Cellular Respiration Review

Chapter 8 Questions (p.100)

5) (a)  The diameter of the mitochondrion was 700 nm. The magnification of the image would be: Magnification = size of image/actual size of specimen

  • Magnification = 80mm/700nm
  • Magnification = 80000nm/700nm
  • Magnification = 114.29X

(b) Figure 17 has wider surface area in which the surfaces of the inner mitochondrial membrane are flat, whereas in figure 18, the surface area is more narrow as it consists of many holes. The cristae in figure 17 therefore is shown to be more deeper and larger compared to the cristae in figure 18. Also, because the inner mitochondrial membrane of figure 18 consists of many small and steep cristae, it constructs a more globular shape, whereas the figure 17 is more of a flat structure.

(c) Electron transport could cause an increase in the volume of fluid inside the cristae because energy is increased in the fluid due to the movement of electrons from the matrix to the intermembrane space. Since the electrons are being active, they produce more ATP, adding more volume to the fluid inside the cristae.

(d) Narrow tubular connections could help ATP synthesis by one of the cristae in a mitochondrion because it will take a shorter time for the reaction to go through in a more narrow tube. Thee narrow connectors will enable the protons to go through the ATP synthesis quicker and increase the rate of respiration, causing the ATP production to become more efficient.


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