Ncert Exercises & Solutions

Select which one is not true for ribosome

1. Made up of two sub-units

2. Form polysome

3. May attach to mRNA

4. Have no role in protein synthesis

(d) Ribosomes are truly called as protein factory and they play a vital role in proteins synthesis. Thus, the statement that ribosomes have no role in protein synthesis is no true.

Other statements are true for ribosome.
Ribosomes are made up of two subunits, i.e., large and small. In prokaryotesit is 70S (508 and 308). In eukaryotesit is 80S (60S and 40S).
In prokaryotesit is 70S (508 and 308).

In eukaryotesit is 80S (60S and 40S).

Polyribosomes.
Several ribosomesattach to a single mRNA and form a chainlike structrue.
Polysomes.
They are formed by the attachment of ribosomes with mRNA.

Page 129, XI NCERT

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