Which of the following is incorrect?

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(D) The correct answer is $D$. $m-RNA$ (messenger $RNA$) is synthesized in the nucleus during transcription. $r-RNA$ (ribosomal $RNA$) is a structural

Vedclass · Accepted Answer

There are $63$ types of $t-RNA$.

Vedclass · Answer

(D) The correct answer is $D$. $m-RNA$ (messenger $RNA$) is synthesized in the nucleus during transcription. $r-RNA$ (ribosomal $RNA$) is a structural component of ribosomes. $t-RNA$ (transfer $RNA$) typically consists of about $73-93$ nucleotides,so $75$ is a valid average length. There are $64$ codons in the genetic code,but only $61$ code for amino acids (the other $3$ are stop codons). Therefore,there are $61$ types of $t-RNA$ molecules,not $63$.

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