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  • Find the mismatched pair from the following:Option: 1 Prokaryotes - Nucleoid  <div class='qna-option

Find the mismatched pair from the following:

Option: 1

Prokaryotes - Nucleoid

 


Option: 2

Eukaryotes - Nucleus


Option: 3

Plant cell - 70S ribosome

 


Option: 4

Bacteria - 80S ribosome


Answers (1)

best_answer

Bacteria and archaebacteria have 70S ribosomes, which are made up of a tiny 30S component and a big 50S subunit. The "S" stands for svedbergs, a unit of measurement for how quickly molecules travel in a centrifuge. Hence option (D) is the correct option.

Option (A) is incorrect because it is correctly matched pair. Bacterial cells, for example, contain a free-floating chromosome that is generally circular and is not surrounded by a nuclear membrane. Instead, the DNA merely resides in a cell area known as the nucleoid.

Option (B) is incorrect because it is correctly matched pair. Fungi, protozoa, eukaryotic algae, and, of course, plants and animals, including ourselves, are all eukaryotes (meaning "true nuclei" in Greek). Eukaryotic cells have a nucleus that is surrounded by membranes and contains chromosomal DNA.

Option (C) is incorrect because it is correctly matched pair. Plant cells include three types of ribosomes: 80S ribosomes in the cytoplasm, 70S-like ribosomes in the chloroplasts, and mitochondrial ribosomes.

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Anam Khan

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