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Many ribosomes may associate with a sing...

Many ribosomes may associate with a single mRNA to form mutiple copies of a poolypeptide simultaneously. Such strings of ribosomes are termed as

A

Polysomes

B

Plastidomes

C

Polyhedral bodies

D

Nucleosomes

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Several ribosomes may attach to a single mRNA and form a chain called

Assertion (A) : DNA code is copied in the synthesis of m-RNA. Reason ( R ) : t-RNA moves out of nucleus and after attaching on ribosomes form the template.

The following features occur during protein synthesis: (a) Movement of mRNA from the nucleus into the cytoplasm, where it binds to the ribosomes (b) Formation of tRNA-amino acid complex (c) Transcription of specific segments of DNA into mRNA molecules in the nucleus (d) Binding of N-terminal amino acid, methionine tRNA to the 'P' site of the ribosome. The tRNA anticodon 'pairs with AUG on mRNA' (e) Formation of peptide bond between first and second amino acids at the A site (f) Release of the complete polypeptide chain from mRNA and the ribosomes (g) Migration of dipeptide to form a tripeptide and then a polypeptide The correct order of events is: