Q.What attributes make Arabidopsis a suitable model plant for molecular genetic research?

Arabidopsis telomeres really are built from TTTAGGG repeats (A is true), but they are made by telomerase, not by a restriction endonuclease (R is false as an explanation).

Arabidopsis thaliana, like most plants, has telomeres composed of many tandem copies of a short, G-rich repeat sequence, TTTAGGG, that cap the ends of linear chromosomes and protect them from degradation and end-to-end fusion, so Assertion (A) is a correct statement of fact. The mechanism responsible for generating and extending this repetitive sequence, however, is telomerase, a ribonucleoprotein enzyme with reverse-transcriptase activity that carries its own short RNA template and uses it to add new TTTAGGG repeats onto the 3' end of the chromosome, compensating for the sequence lost each time DNA replication fails to fully copy a linear chromosome's very end. A restriction endonuclease, by contrast, is an enzyme (mostly of bacterial origin, used extensively in recombinant DNA technology) that recognises a short, …