(a) Difference between repetitive and satellite DNA are as follows:
Repetitive DNA consists of short identical genes which are repeated in tandem several hundred or thousand times. It is of two types. Highly repetitive DNA (satellite DNAs) and moderately repetitive DNA. They are mainly found in telomere, centromere and ends of transposons.
The proportion of the DNA of a eukaryotic cell that consists of very large number (approximately 106) of copies of a short nucleotide sequence. It occurs mainly around the centromeres and telomers of the chromosomes. The highly repetitive nature of this DNA fraction gives it a distinctive base composition, and consequently when samples of DNA are centrifuged it forms so-called ‘satellite bands quite separate from the band representing the bulk of the cell’s DNA.
Messenger RNA (mRNA)
Transfer RNA (tRNA)
Percentage of cell’s total RNA
Length of molecule
Shape of molecule
Clover leaf-like, folded into L-shape
Carry information from DNA
Carry amino acids to mRNA codons
Very short, 2 minutes to 4 hours, degraded
Long, used again and again in translation
Transfer genetic information from genes to ribosomes to synthesize proteins
Transfer amino acid to mRNA
Strand of DNA having 3’-5’ polarity.
Strand of DNA having 5’-3’ polarity.
It serves as the template in transcription and produces working copies of RNA molecule and is also known as master strand or sense strand.
It does not participate in transcription and is also called non template strand.
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