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Features of Codon

AUG initiator...

Question

AUG initiator codon occurs over

A

3' end of mRNA

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B

5' end of mRNA

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C

Short arm of tRNA

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D

Long arm of tRNA

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Solution

The correct option is B 5' end of mRNA
AUG- initiator codon occurs at 5’ end of mRNA.

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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. In mRNA, AUG is the initiation codon and UAA, UAG and UGA are termination codons, therefore polypeptide cannot be synthesized beyond any of these triplets to the end of mRNA. Then which one of the following mRNA can be translated completely?

Q. Select the incorrect statement.
a. Six codons do not code for any amino acid.
b. Codon reading of mRNA is contiguous.
c. Three codons function as stop codons.
d. Initiator codon AUG codes for methionine.

Select the incorrect statement(s).

1. Six codons do not code for any amino acid.

2. Codon is read in mRNA in a contiguous fashion.

3. Three codons function as stop codons.

4. The initiator codon AUG codes for methionine .

Q. If the base sequence of a codon in mRNA is 5-AUG-3, the sequence of mRNA pairing with it must be

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