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STD 12 - 5. molecular basis of inheritance — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 5. molecular basis of inheritance1 Mark
MCQ
Amino acid sequence, in protein synthesis is decided by the sequence of
  • A
    $rRNA$
  • B
    $tRNA$
  • ✓
    $mRNA$
  • D
    $cDNA$
✓

Answer

Correct option: C.
$mRNA$
c
(c) : Messenger $RNA$ or $mRNA$ has been named so because it carries the coded information from $DNA$ for the synthesis of proteins. It carries the coded information in a number ofbase triplets called codons. It is transcribed on $DNA$ by the enzyme $RNA$ polymerase. Hence, its base sequence is complementary to $DNA$ on which it has been synthesized. In eukaryotes each gene transcribes its own $mRNA$, therefore the number of $mRNAs$ corresponds to the number of genes. $rRNA$ is a type of $RNA$ that forms structural and functional components of ribosomes. $tRNA$ is a class of $RNA$ having structures with triplet nucleotide sequences that are complementary to the triplet nucleotide coding sequences of $mRNA$. It binds with amino acids and transfers them to ribosomes.

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