Q28-8P - Organic Chemistry (Mcmurry)

Question

 List anticodon sequences on the tRNAs carrying the amino acid shown as below:

(a)Ala

(b) Phe 

(c) Leu 

(d) Tyr

Step-by-Step Solution

Answer

The codons of the sequences for the amino acids can be listed as below here 

(a) 

$\begin{array}{l}\mathrm{Codons}\mathrm{Anticodons}\\ (5\text{'})-\mathrm{GCU}-(3\text{'})(3\text{'})-\mathrm{CGA}-(5\text{'})\\ (5\text{'})-\mathrm{GCC}-(3\text{'})(3\text{'})-\mathrm{CGG}-(5\text{'})\\ (5\text{'})-\mathrm{GCA}-(3\text{'})(3\text{'})-\mathrm{CGU}-(5\text{'})\\ (5\text{'})-\mathrm{GCG}-(3\text{'})(3\text{'})-\mathrm{CGC}-(5\text{'})\end{array}$

(b)

$\begin{array}{l}\mathrm{Codons} \mathrm{Anticodons}\\ (5\text{'})-\mathrm{UUU}-(3\text{'})(3\text{'})-\mathrm{AAA}-(5\text{'})\\ (5\text{'})-\mathrm{UUC}-(3\text{'})(3\text{'})-\mathrm{AAG}-(5\text{'})\end{array}$

 

 

(c)

$\begin{array}{l}\mathrm{Codons}\mathrm{Anticodons}\\ (5\text{'})-\mathrm{UUA}-(3\text{'})(3\text{'})-\mathrm{AAU}-(5\text{'})\\ (5\text{'})-\mathrm{UUG}-(3\text{'})(3\text{'})-\mathrm{AAC}-(5\text{'})\\ (5\text{'})-\mathrm{CUU}-(3\text{'})(3\text{'})-\mathrm{GAA}-(5\text{'})\\ (5\text{'})-\mathrm{CUC}-(3\text{'})(3\text{'})-\mathrm{GAG}-(5\text{'})\\ (5\text{'})-\mathrm{CUA}-(3\text{'})(3\text{'})-\mathrm{GAU}-(5\text{'})\\ (5\text{'})-\mathrm{CUG}-(3\text{'})(3\text{'})-\mathrm{GAC}-(5\text{'})\end{array}$

 

(d) 

$\begin{array}{l}\mathrm{Codons}\mathrm{Anticodons}\\ (5\text{'})-\mathrm{UAU}-(3\text{'})(3\text{'})-\mathrm{AUA}-(5\text{'})\\ (5\text{'})-\mathrm{UAC}-(3\text{'})(3\text{'})-\mathrm{AUG}-(5\text{'})\end{array}$

Step 1: (a) Codon sequence of Ala

The replacement of A by U, U by A, G by C, and C by G. The anticodon number is the same as codons. The codon sequences are,

$\begin{array}{l}\mathrm{Codons}\mathrm{Anticodons}\\ (5\text{'})-\mathrm{GCU}-(3\text{'})(3\text{'})-\mathrm{CGA}-(5\text{'})\\ (5\text{'})-\mathrm{GCC}-(3\text{'})(3\text{'})-\mathrm{CGG}-(5\text{'})\\ (5\text{'})-\mathrm{GCA}-(3\text{'})(3\text{'})-\mathrm{CGU}-(5\text{'})\\ (5\text{'})-\mathrm{GCG}-(3\text{'})(3\text{'})-\mathrm{CGC}-(5\text{'})\end{array}$

Step 2: (b) Codon sequence of Phe

The replacement of A by U, U by A, G by C, and C by G. The anticodon number is the same as codons. The codon sequences are,

$\begin{array}{l}\mathrm{Codons} \mathrm{Anticodons}\\ (5\text{'})-\mathrm{UUU}-(3\text{'})(3\text{'})-\mathrm{AAA}-(5\text{'})\\ (5\text{'})-\mathrm{UUC}-(3\text{'})(3\text{'})-\mathrm{AAG}-(5\text{'})\end{array}$

Step 3: (c) Codon sequence of Leu

The replacement of A by U, U by A, G by C, and C by G. The anticodon number is the same as codons. The codon sequences are,

$\begin{array}{l}\mathrm{Codons}\mathrm{Anticodons}\\ (5\text{'})-\mathrm{UUA}-(3\text{'})(3\text{'})-\mathrm{AAU}-(5\text{'})\\ (5\text{'})-\mathrm{UUG}-(3\text{'})(3\text{'})-\mathrm{AAC}-(5\text{'})\\ (5\text{'})-\mathrm{CUU}-(3\text{'})(3\text{'})-\mathrm{GAA}-(5\text{'})\\ (5\text{'})-\mathrm{CUC}-(3\text{'})(3\text{'})-\mathrm{GAG}-(5\text{'})\\ (5\text{'})-\mathrm{CUA}-(3\text{'})(3\text{'})-\mathrm{GAU}-(5\text{'})\\ (5\text{'})-\mathrm{CUG}-(3\text{'})(3\text{'})-\mathrm{GAC}-(5\text{'})\end{array}$

Step 4: (d) Codon sequence of Tyr

The replacement of A by U, U by A, G by C, and C by G. The anticodon number is the same as codons. The codon sequences are,

$\begin{array}{l}\mathrm{Codons}\mathrm{Anticodons}\\ (5\text{'})-\mathrm{UAU}-(3\text{'})(3\text{'})-\mathrm{AUA}-(5\text{'})\\ (5\text{'})-\mathrm{UAC}-(3\text{'})(3\text{'})-\mathrm{AUG}-(5\text{'})\end{array}$