Question

question 6 of 10
what do mitochondrial and thylakoid membranes have in common?
a. they both are involved in cellular respiration in animal cells.
b. they both are sites of electron transport chains.
c. they both contain the chlorophyll pigment.
d. they both produce fad and nadh molecules.

Explanation:

• Option A: Thylakoid membranes are involved in photosynthesis (not cellular respiration in animal cells). Mitochondrial membranes are involved in cellular respiration. So A is wrong.
• Option B: Thylakoid membranes are in chloroplasts (plant - related, for photosynthesis), not sites for cellular respiration in animal cells. Mitochondrial membranes are for cellular respiration. So B is wrong.
• Option C: In mitochondria, the electron - transport chain (ETC) is in the inner mitochondrial membrane and is a key part of oxidative phosphorylation (cellular respiration). In chloroplasts, the thylakoid membrane has an ETC that is part of the light - dependent reactions of photosynthesis. So C is correct.
• Option D: Chlorophyll is in thylakoid membranes (for photosynthesis), not in mitochondrial membranes. Mitochondrial membranes are involved in reactions that produce ATP (using NADH and FADH₂, but not producing them in the membrane in the same sense as thylakoid - related processes). So D is wrong.

Answer:

C. They both contain the electron transport chains.