Nucleic acids and protein synthesis Quiz (3) Biology AS Level

The PDx1 protein is found in a wide range of animal species where it is regarded as essential for normal metabolism. In sand rats, the gene coding for the PDx1 protein has a much lower proportion of A and T nucleotides than PDx1 genes from other animals.
Finding the complete DNA sequence of the PDx1 gene in sand rats has been difficult.
Sequencing involves splitting off nucleotides one at a time from single-stranded DNA.
What could account for the…