Biology
Grade-9
Easy
Question
Satellite DNA is present in __________.
- Nucleolus
- Chromosome
- Lysosome
- Nucleosome
Hint:
The density of DNA is a function of its base and sequence, and satellite DNA with its highly repetitive DNA has a reduced or a characteristic density compared to the rest of the genome. Thus, the name 'satellite DNA' was coined.
The correct answer is: Chromosome
Satelite DNA is present in chromosome.
Satellite DNA (satDNA) is the highly repetitive DNA consisting of short sequences repeated a large number of times. It carries a variable AT-rich repeat unit that often forms arrays up to 100 Mb. The monomer length of satDNA sequences ranges from 150 to 400 bp in the majority of plants and animals.
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