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Golgi Apparatus

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Question

Choose the correct answers from the alternatives given :
In translation, an initiation complex consists of:

A

an initiator tRNA

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B

a large ribosomal subunit

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C

a small ribosomal subunit

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D

the start codon of mRNA

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Solution

The correct option is A an initiator tRNA
The initiation of protein synthesis primarily involves the recruitment of a ribosome initiator tRNA complex to the initiation codon of a messenger RNA. Therefore, in translation, an initiation complex consists of an initiator tRNA.
So, the correct option is 'initiator tRNA'.

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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. 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. Choose the correct answers from the alternatives given :
The signal to start translation is the initiator codon, usually AUG. This codes for:

m R N A, t R N A

and ribosomes help in the process of translation?

Q. Choose the correct answer from the alternatives given :
To initiate translation, the mRNA first binds to

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