[Campbell Biology P.248] Based on Figure 10.16, in which specific regions do electron transp... | Practice Question

Based on Figure 10.16, in which specific regions do electron transport chains establish a higher concentration of protons H+ in mitochondria and chloroplasts, respectively?

  • A: Mitochondria: Matrix; Chloroplasts: Stroma
  • B: Mitochondria: Intermembrane space; Chloroplasts: Thylakoid space
  • C: Mitochondria: Intermembrane space; Chloroplasts: Stroma
  • D: Mitochondria: Matrix; Chloroplasts: Thylakoid space

Explanation

Figure 10.16 and its caption indicate that electron transport chains pump protons into the intermembrane space in mitochondria creating a high H+ concentration and into the thylakoid space in chloroplasts creating a high H+ concentration . These are the regions where H+ accumulates before diffusing through ATP synthase.