37) Draw the structure of a mitochondrion and indicate the sites of oxidative phosphorylation and the citric acid cycle. Be sure to label your figure to clearly denote where these processes take place. Ans:The drawing should include the overall shape with the outer membrane and the inner membrane, the inner-membrane space, matrix, and cristae labeled. Most of the TCA cycle takes place in the matrix, while oxidative phosphorylation occurs in the inner mitochondrial membrane. It should closely resemble text Figure 18.2. Section: 18.138) What is the currently accepted model which explains the presence of mitochondria in eukaryotic cells? What is the best evidence which supports this model? 39) What is the driving force for electron transport through the electron-transport chain? 40) Explain why less ATP is made from the reoxidation of FADH2as compared to NADH.41) Give the balanced equation for the net reaction catalyzed by Q-cytochrome coxido-reducatase.Ans:QH2+ 2 Cyt cox+ 2 H+matrixQ + 2 Cyt cred+ 4 H+cytosolSection: 18.342) Describe the major defensive strategy that cells employ to prevent the harmful effects of the reactive oxygen species (ROS) that are inevitably produced during respiration.