Table 8.2
Codons in mRNA molecule and their corresponding amino acids
$$\begin{array} { | c | c | c | c | }
\hline \text { UUU } & \text { Phenylalanine } & \text { UAU } & \text { tyrosine } \
\hline \text { UUA } & \text { leucine } & \text { UAA } & \text { nonsense } \
\hline \text { GCA } & \text { alanine } & \text { AAU } & \text { asparagine } \
\hline \text { AAG } & \text { lysine } & \text { UGC } & \text { cysteine } \
\hline \text { GUU } & \text { valine } & \text { UCG, UCU } & \text { serine } \
\hline
\end{array}$$

-Refer to Table 8.2.If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine,the coding for the antisense strand of DNA is
A)5' ACAGTTTCAAT 3'.
B)5' TCTGCAAAGTTA 3'.
C)3' UGUGCAAAGUUA 5'.
D)3' UCUCGAAAGUUA 5'.
E)3' TCACGUUUCAAU 5'.

Question

Table 8.2
Codons in mRNA molecule and their corresponding amino acids
 $$\begin{array} { | c | c | c | c | } 
\hline \text { UUU } & \text { Phenylalanine } & \text { UAU } & \text { tyrosine } \
\hline \text { UUA } & \text { leucine } & \text { UAA } & \text { nonsense } \
\hline \text { GCA } & \text { alanine } & \text { AAU } & \text { asparagine } \
\hline \text { AAG } & \text { lysine } & \text { UGC } & \text { cysteine } \
\hline \text { GUU } & \text { valine } & \text { UCG, UCU } & \text { serine } \
\hline
\end{array}$$

-Refer to Table 8.2.If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine,the coding for the antisense strand of DNA is
A)5' ACAGTTTCAAT 3'.
B)5' TCTGCAAAGTTA 3'.
C)3' UGUGCAAAGUUA 5'.
D)3' UCUCGAAAGUUA 5'.
E)3' TCACGUUUCAAU 5'.

Quizplus · Accepted Answer

To determine the coding for the antisense strand of DNA, we need to determine the complementary strand of the mRNA, and then determine the coding for the complementary DNA strand.

The sequence of amino acids encoded by the sense strand of DNA is:

Serine-Alanine-Lysine-Leucine

This can be translated into the mRNA sequence:

5' AGCUCCCUGCCAUGUC 3'

To determine the complementary mRNA sequence, we need to match each nucleotide with its complementary base:

A → U 
G → C 
C → G 
U → A

The complementary mRNA sequence is therefore:

3' UCGAGGGACGGUACAG 5'

To determine the coding for the antisense strand of DNA, we need to match each nucleotide with its complementary base and reverse the order:

U → A 
C → G 
G → C 
A → T

The coding for the antisense strand of DNA is therefore:

5' TCTGCAAAGTTA 3'

Table 82 Codons in MRNA Molecule and Their Corresponding Amino Acids

Table 82
Codons in MRNA Molecule and Their Corresponding Amino Acids