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Differentiate between the followings: ...

Differentiate between the followings:
a. Repetitive DNA and Satellite DNA b. mRNA and tRNA c. Template strand and Coding strand

Text Solution

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a. Repetitive sequences are stretches of DNA sequences that are repeated many times, sometimes hundred to thousand times. When the repetitive DNA sequences are separated from bulk genomic DNA as different peaks during density gradient centrifugation, the bulk DNA forms major peak and the other small peaks are referred to as satellite DNA.
b. mRNA or messenger RNA is transcribed from DNA. It carries the genetic information from DNA to the ribosomes for protein synthesis. tRNA or transfer RNA is the smallest RNA. It has a triplet code which is complementary to the codon in the mRNA. It carries amino acids to the site of protein synthesis.
c. The strand with polarity `3. to 5. ` acts as a template during DNA synthesis. This strand is called template strand. The strand which does not code for anything is called coding strand.
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