The table below shows some of the 64 available codons and their associated amino acids.
Codon |
Amino acid |
AGG |
arginine |
CAG |
glutamine |
GGG |
glycine |
GGU |
glycine |
GUU |
valine |
UUA |
leucine |
UCA |
serine |
UUU |
phenylalanime |
The diagram below shows the coding strand of a length of DNA with its bases indicated.
T A C A A T C C C A A A A T C
a) Write down the base sequence of a length of the mature RNA that would be transcribed from this DNA.
b) In a eukaryotic cell, the base sequence of the mRNA might be different from the sequence of the HnRNA. Explain why.
c) ‘Genetic code is nearly universal’. Explain this statement.
d) Explain why glycine has two codons in the above table.
e) Give reasons why RNA is less stable than DNA