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MDCAT Biology QUESTION #4313
Question 1
Which of the following is the correct sequence of cellular molecules from highest to lowest amount in the cell?
  • DNA $>$ rRNA $>$ tRNA $>$ mRNA✔️
  • rRNA $>$ tRNA $>$ mRNA $>$ DNA
  • mRNA $>$ tRNA $>$ rRNA $>$ DNA
  • DNA $>$ mRNA $>$ tRNA $>$ rRNA
Correct Answer Explanation
In a cell: DNA exists as 2 copies (diploid), rRNA is the most abundant RNA (~80%), tRNA is next (~15%), and mRNA is least (~5%). Correct order: DNA $>$ rRNA $>$ tRNA $>$ mRNA.