Identify the correct sentence. a. Bacteria , Blue green alge , Prokrayotic cells . b. No nucleus in some mammals of RBC. c. No nucleus in phloem seive tubes. d. all the above.
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Pilus refers to a thin and rigid hair-like appendage that protrudes from the cell surface of bacteria (prokaryotic cell) and is responsible for bacterial conjugation.
They are absent in eukaryotic cells.
The ribosomes present in a bacteria and the cellular organelles (mitochondria and chloroplasts) are 70S type and those present in a eukaryotic cell (both plants and animals) are 80S type.
So, the correct answer is 'a and b are wrong, c is correct'.
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