Which of the following are characteristics of prokaryotic cells ? (a) Ribosomes are made of 50S and 30S subunits (b) They can have plasmids (c) They contain mesosome (d) They have peroxisomes Choose the correct answer from the options given below :
A. (a), (b) and (c) only
Prokaryotic cells have 70S ribosomes, which are composed of two subunits: a larger 50S subunit and a smaller 30S subunit. Thus, statement (a) is correct. Many prokaryotes, such as bacteria, contain small, circular, extrachromosomal DNA molecules called plasmids. Thus, statement (b) is correct. Mesosomes are specialized membranous structures formed by the infolding of the plasma membrane into the cell, which are characteristic of prokaryotes. Thus, statement (c) is correct. Peroxisomes are membrane-bound organelles found only in eukaryotic cells. Prokaryotes lack membrane-bound organelles. Thus, statement (d) is incorrect. Therefore, only statements (a), (b), and (c) are correct characteristics of prokaryotic cells. Answer: (a), (b) and (c) only
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