A) thymine rich repeats
B) cytosine rich repeats
C) adenine rich repeats
D) guanine rich repeats
Correct Answer: D
Solution :
Telomeres have been shown to have unique structures that include short nucleotide sequences present as tandemly repeated units. The basic repeat sequence in all the species studied has the pattern \[5'-{{T}_{1-4}}{{A}_{0-1}}{{G}_{1-8}}-3'\]. Same repeated sequence is found in at the end of all chromosomes in a species. Not only this, same telomere sequence may occur in widely divergent species (e.g., Human beings, Neurospara and some acellular slime molds). Clusters of G residues in one strand and C residues in the other characterise telomeric DNA. Also, in some species the telomeres terminate with a single-stranded DNA (12-16 nucleotides long) rich in guanine.
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