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Ribosomes of Eukaryotic Cell

Ribosome

Question

Ribosome

A

Consists of one large and two small subunits

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B

Contains identical components in prokaryote and eukaryote

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C

Is the only site of RNA replication

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D

Has two or three major sites to which tRNA can be bound

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Solution

The correct option is D Has two or three major sites to which tRNA can be bound
Ribosome consists of one large and one small subunit. Eukaryotes have 80S ribosomes while prokaryotes have 70S ribosomes. Four binding sites are present in the ribosomes one for mRNA and 3 for tRNA.
So the correct answer is C.

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Similar questions

Q. A smaller subunit of ribosome has a binding site for ______ and the larger subunit has two binding sites for tRNA molecules.

Q. Arrange the following events in the order of synthesis of a protein
i) A peptide bond forms
ii) A tRNA matches its anticodon to the codon in the A- site
iii) The movement of second tRNA complex from A-site to P-site
iv) The large subunit attaches to the small subunit and the initiator tRNA fits in the P-site
v) A small subunit binds to the mRNA
vi) The activated amino acid tRNA complex attaches the initiation codon on mRNA

Q. Arrange the order of events of initiation of translation. I. AUG or GUG comes to lie over P-site to produce 40S-mRNA complex.
II. P-site attracts tRNA which lies opposite to initiation codon to form 40S-mRNA-tRNA^met.
III.Union of the two subunits of ribosomes occurs, A site becomes operational and second codon of mRNA lies over it.
IV. mRNA attaches itself to smaller subunit of ribosome with its cap coming in contact with 3’ end of 18 S rRNA.
V. The larger subunit of ribosome now attaches to 40S-mRNA-tRNA^metcomplex to form 80S mRNA-tRNA complex.
a. I, II, III, IV, V
b.II, V, III, IV, I
c. III, IV, V, I, II
d. IV,I,II,V,III

Q. Which of the classes of RNA molecules is linked with proteins in forming the large and small subunits of a cytoplasmic structure?

Q. Regarding the assertion and reason, select the correct choice.
Assertion [A]: The amino acid-bound tRNA enters the aminoacyl tRNA binding site.
Reason [R]: The amino acid-bound tRNA transfers the amino acid at the peptidyl tRNA site.

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