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Consider the following statements in respect of cell and its structure :
I. All cells possess cell wall.
II. All cells have ribosomes present inside.
III. All cells have well-organized nucleus.
IV. All cells have linear DNA molecules present in them.
Which of the statements given above is/are correct?
Explanation
Statement I is incorrect because while plants, fungi, and bacteria have cell walls, animal cells do not.
Statement II is correct. Ribosomes are universal components of all living cells (both prokaryotic and eukaryotic) as they are the sites for protein synthesis.
Statement III is incorrect because prokaryotic cells (like bacteria) lack a membrane-bound, well-organized nucleus; instead, their genetic material is located in an irregular region called the nucleoid.
Statement IV is incorrect because prokaryotes typically possess circular DNA molecules. Linear DNA is characteristic of the nuclear genome in eukaryotes, though even eukaryotes contain circular DNA within their mitochondria and chloroplasts.
Therefore, only statement II is correct.