Distinguish between: Repetitive $DNA$ and Satellite $DNA$.

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Repetitive $DNA$ Satellite $DNA$
$(1)$ It consists of non-coding $DNA$ sequences that are present in multiple copies,either in tandem or interspersed. $(1)$ It consists of non-coding $DNA$ sequences that are present in tandem repeats.
$(2)$ The length of the repeat unit can range from a few base pairs to thousands of base pairs. $(2)$ These are typically short repeat sequences (up to $60$ base pairs).
$(3)$ It forms lighter bands in a cesium chloride density gradient. $(3)$ It forms small,distinct dark bands (satellite peaks) in a cesium chloride density gradient.

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In $DNA$,uracil is replaced by

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