Question
What are the basic constituents of ribosomes? Explain the role of A and P sites of ribosomes in protein biosynthesis.
Answer :
Word Count : 346
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Ribosomes are composed of about equal amounts of rRNA (ribosomal ribonucleic acid), and proteins, with a little proportion of lipids and certain metallic ions such as Mg, Ca and Mn. Proteins and rRNA are the major constituents of ribosomes. Their proportion in both types of ribosomes (70S and 80S) is variable.
Ribosomal proteins in small subunits are prefixed by an alphabet ‘S’ and in large subunits by ‘L’. Most of ribosomal proteins act as enzymes which catalyze protein synthesis at various stages. Ribosomal RNA (rRNA) in 70S and 80S ribosomes are of three types, i.e., in 70S these are 23, 16 and 5S rRNA and in 80S
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