Which type of repeat unit is
Satellite DNA is classified by repeat unit size and total array length. Microsatellites, also called simple sequence repeats, contain repeat motifs of one to nine base pairs, typically one to six, arranged in tandem arrays of less than one hundred base pairs total length. Their small unit size distinguishes them from minisatellites where repeat units span ten to sixty base pairs and macrosatellites with hundreds of base pairs. Indels are not tandem repeats but insertions or deletions, differing fundamentally in origin and structural organization.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.