The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C) and (D). Select the part correctly matched with its function.
1. | Part (A) : Matrix – a major site for respiratory chain enzymes |
2. | Part (D) : Outer membrane – gives rise to the inner membrane by splitting |
3. | Part (B) : Inner membrane – forms infoldings called cristae |
4. | Part (C) : Cristae – possess single circular DNA molecule and ribosome |
Consider the following statements:
I: | It is postulated that mitochondria and chloroplasts, during evolution, developed a symbiotic relationship, with plant and animal cells. |
II: | Both mitochondria and chloroplasts are formed de novo during cell division. |
III: | Both mitochondria and chloroplasts are totally autonomous bodies. |
IV: | Both mitochondria and chloroplasts have circular DNA associated with histones. |
The correct statements include:
1. None
2. I only
3. II, III and IV
4. I, II and III
Assertion (A): | Mitochondria are called ‘power houses’ of the cell. |
Reason (R): | They produce cellular energy in the form of ATP. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
3. | (A) is true, but (R) is false. |
4. | (A) is false, but (R) is true. |