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A part of an mRNA molecule with the following sequence is being read by a ribosome: [tex]5^{\prime}\text{-}CCG\text{-}ACG\text{-}3^{\prime}[/tex] (mRNA). The charged transfer RNA molecules shown in the figure below (with their anticodons shown in the [tex]3^{\prime}[/tex] to [tex]5^{\prime}[/tex] direction) are available. Two of them can correctly match the mRNA so that a dipeptide can form:

\begin{tabular}{|c|c|}
\hline tRNA Anticodon & Amino Acid \\
\hline GGC & Proline \\
\hline CGU & Alanine \\
\hline UGC & Threonine \\
\hline CCG & Glycine \\
\hline ACG & Cysteine \\
\hline CGG & Alanine \\
\hline
\end{tabular}

Which of the following dipeptides will be formed?

A. Proline-Threonine
B. Glycine-Cysteine
C. Alanine-Alanine



Answer :

GinnyAnswer
To determine which dipeptide will be formed, we need to follow several steps to match the given mRNA codons with the appropriate tRNA anticodons and their corresponding amino acids.

### Step-by-Step Solution:

1. Identify the mRNA Sequence:
- The given mRNA sequence is: [tex]\( 5' \text{CCG} \text{ACG} 3' \)[/tex].

2. Split the mRNA into Codons:
- The sequence can be split into two codons:
- Codon 1: [tex]\( \text{CCG} \)[/tex]
- Codon 2: [tex]\( \text{ACG} \)[/tex]

3. Identify the Complementary tRNA Anticodons:
- Remember, anticodons are complementary to codons and are read in the [tex]\( 3' \)[/tex] to [tex]\( 5' \)[/tex] direction.
- For codon [tex]\( \text{CCG} \)[/tex]:
- Complementary tRNA anticodon: [tex]\( 3' \text{GGC} 5' \)[/tex]
- For codon [tex]\( \text{ACG} \)[/tex]:
- Complementary tRNA anticodon: [tex]\( 3' \text{UGC} 5' \)[/tex]

4. Match tRNA Anticodons to Amino Acids:
- From the provided data:
- Anticodon [tex]\( \text{GGC} \)[/tex] corresponds to the amino acid "Proline".
- Anticodon [tex]\( \text{UGC} \)[/tex] corresponds to the amino acid "Threonine".

5. Form the Dipeptide:
- The mRNA sequence [tex]\( \text{CCG} \text{ACG} \)[/tex] will lead to the following dipeptide:
- "Proline-Threonine"

Given the information, the correct dipeptide formed is:

[tex]\[ \boxed{\text{Proline-Threonine}} \][/tex]

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