Question
Choose the correct statements regarding cell organelles and their inclusions.
A. The endomembrane system includes Golgi complex, endoplasmic reticulum and mitochondria.
B. Rough endoplasmic reticulum bears ribosomes on its surface.
C. Both mitochondria and plastids have circular DNA.
D. A network of microtubules, microfilaments and intermediate filaments present in the cytoplasm is called cytoskeleton.
E. Mitochondrion is a single membrane-bound structure.
Choose the correct answer from the options given below :
This question was previously asked in
NEET UG Re-Exam 2026 Question Paper (21-Jun-2026)
The correct answer is
B, C and D only
Cell Organelle Statements Analysis
We need to evaluate each statement about cell organelles and inclusions to determine which are correct.
Statement A: Endomembrane System Components
- The endomembrane system is a group of membranes and organelles in eukaryotic cells that works together to modify, package, and transport lipids and proteins.
- It includes the nuclear envelope, lysosomes, vesicles, the endoplasmic reticulum, and the Golgi apparatus.
- Mitochondria are generally not considered part of the endomembrane system because they have a different evolutionary origin and operate relatively independently.
- Therefore, statement A is incorrect.
Statement B: Rough Endoplasmic Reticulum (RER)
- The Rough endoplasmic reticulum (RER) is characterized by the presence of ribosomes attached to its outer surface.
- These attached ribosomes synthesize proteins that are often destined for secretion, insertion into membranes, or delivery to other organelles.
- Therefore, statement B is correct.
Statement C: DNA in Mitochondria and Plastids
- Mitochondria and plastids (like chloroplasts) are unique organelles because they contain their own genetic material.
- This DNA is typically in a circular form, similar to the DNA found in bacteria.
- This feature supports the endosymbiotic theory regarding their origin.
- Therefore, statement C is correct.
Statement D: Cytoskeleton Components
- The cytoskeleton is an intricate network within the cytoplasm of eukaryotic cells.
- It is composed of protein filaments and tubules, including microtubules, microfilaments (actin filaments), and intermediate filaments.
- It provides mechanical support, maintains cell shape, and enables cell movement.
- Therefore, statement D is correct.
Statement E: Mitochondrion Membrane Structure
- Mitochondria are characterized by having two membranes: an outer membrane and a highly folded inner membrane (forming cristae).
- This double-membrane structure is crucial for its function in cellular respiration.
- Therefore, statement E is incorrect.
Conclusion on Correct Statements
Based on the analysis:
- Statement A is incorrect.
- Statement B is correct.
- Statement C is correct.
- Statement D is correct.
- Statement E is incorrect.
The correct statements are B, C, and D.
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Similar Questions
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$$ \begin{array}{cc} \text{X} & \text{Y} \\ | & | \\ \text{C} - & \text{C} \end{array} \xrightarrow{E} \text{X} - \text{Y} + \text{C} = \text{C} $$
(Substrate) $\quad$ (Product) (Product)
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Important Questions from Structure and Function of Cell
- Match List I with List II :
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Choose the correct answer from the options given below : - Which of the following statements are correct regarding amino acids ?
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C. Valine is a neutral amino acid.
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A. Lipids are generally water soluble.
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