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Features of Codon

If the tRNA a...

Question

If the tRNA anticodon for the amino acid is CAA (reading 3' to 5') then the codon for valine (reading 5' to 3') in mRNA will be

A

TTG

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B

GGU

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C

CCA

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D

CCG

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E

GUU

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Solution

The correct option is A GUU
The mRNA contains the codons and the tRNA have the complementary sequences called as the anticodons. The anticodon on tRNA for valine is CAA and so, the codon on the mRNA sequence will be complementary to CAA as GUU. Since, it is mRNA sequence, T in DNA s replaced by U in RNA.
Thus, the correct answer is option 'GUU'.

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Q. Read the following statements regarding mRNA and tRNA and choose the correct option.

A. mRNA has a more elaborated 3-dimensional structure due to extensive base-pairing.

B. tRNA has a more elaborated 3-dimensional structure due to extensive base-pairing.

C. tRNA is usually smaller than mRNA.

D. mRNA bears anticodons but tRNA has codons.

Q. The amino acid in a tRNA corresponds to its anticodon or correspond to the nucleotides of coding mRNA ?

Q. A tRNA is charged with the amino acid phenylalanine
(a) At what end of tRNA is this amino acid attached?
(b) What is the mRNA codon that coded for phenylalanine?
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Q. The given table shows the genetic code depicting the amino acids that correspond to mRNA codons. Each codon is read from

3^{'}

(first nucleotide) to

5^{'}

(third nucleotide). Find out the amino acid sequence that can be assembled from the mRNA associated with the given DNA strand.

DNA template strand:

5^{'} - G C G A C A T A C A C T - 3^{'}

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