Question

Electron transport chains involve high energy electrons being passed along cytochromes while hydrogen ions move across a membrane to generate ATP. Where are electron transport chains found?
I. Outer mitochondrial membrane
II. Thylakoid membrane
III. Inner mitochondrial membrane

• A. I only
• B. II only
• C. III only
• D. I and III only
• E. II and III only

Answer 1

The correct option is E II and III only

Electron transport chains (ETC) are found in Mitochondria and Chloroplasts.

In mitochondrion, ETC is present in the inner mitochondrial membrane.

In chloroplast, ETC is present in the thylakoid membrane.

So, the correct answer is 'II and III only'.