WJEC Biology for A2 Level: Revision Workbook

Q6 [M, AO1, AO2] The electron micrograph below shows a mitochondrion from muscle tissue. a) Estimate the surface area of the organelle shown using the formula surface area 2π r l + 2 π r 2 , where l = length of organelle 11.2 µm, π =3.14 and diameter is 1.2 µm. Show your working. (2) Answer ....................................................................................................................................................................................................... b) The typical surface area of mitochondria found in most cells ranges between 25 and 40 µm 2 . Suggest the advantage of mitochondria with a larger surface area in muscles. (3) ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... 20 | WJEC Biology for A2 Level: Revision Workbook | Unit 3 Energy, Homeostasis and the Environment Copyright: Sample material