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Which of the following statements about ...

Which of the following statements about the characteristics of organelles are incorrect?
(i) Mitochondria contain their own DNA.
(ii) Lysosomes contain flattened sacs called cistemae.
(iii) Peroxisomes are specialised for carrying out oxidative reactions.
(iv) Ribosomes are always found attached to the Golgi apparatus.

A

(i) and (iii) only

B

(ii) and (iv) only

C

(i), (ii) and (iv) only

D

(i), (ii), (iii) and (iv)

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements about the characteristics of organelles are incorrect, let's analyze each statement step by step. ### Step 1: Analyze Statement (i) **Statement (i): Mitochondria contain their own DNA.** - Mitochondria are known to have their own circular DNA, which is distinct from the nuclear DNA of the cell. This DNA allows mitochondria to replicate independently within the cell. - **Conclusion:** This statement is **correct**. ### Step 2: Analyze Statement (ii) **Statement (ii): Lysosomes contain flattened sacs called cisternae.** - Lysosomes are membrane-bound organelles that contain digestive enzymes. They do not have flattened sacs; instead, they are more spherical in shape. The term "cisternae" refers to the flattened membrane-bound compartments found in the Golgi apparatus, not in lysosomes. - **Conclusion:** This statement is **incorrect**. ### Step 3: Analyze Statement (iii) **Statement (iii): Peroxisomes are specialized for carrying out oxidative reactions.** - Peroxisomes are indeed specialized organelles that carry out oxidative reactions, including the breakdown of fatty acids and the detoxification of hydrogen peroxide. - **Conclusion:** This statement is **correct**. ### Step 4: Analyze Statement (iv) **Statement (iv): Ribosomes are always found attached to the Golgi apparatus.** - Ribosomes can be found either free in the cytoplasm or attached to the endoplasmic reticulum (ER), specifically the rough ER. They are not typically found attached to the Golgi apparatus. - **Conclusion:** This statement is **incorrect**. ### Final Conclusion The incorrect statements are: - (ii) Lysosomes contain flattened sacs called cisternae. - (iv) Ribosomes are always found attached to the Golgi apparatus.
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