Which of the following is the correct higher (left) to lower (right) sequence of molecules with respect to their amount in the cell?
Correct answer: A. DNA to rRNA to tRNA to mRNA
- A. DNA to rRNA to tRNA to mRNA
- B. rRNA to tRNA to mRNA to DNA
- C. mRNA to tRNA to rRNA to DNA
- D. DNA to mRNA to tRNA to rRNA
Explanation
This is the order given in the official UHS answer key. Among the three RNAs the ranking is not disputed: ribosomal RNA is by far the most abundant at roughly 80 per cent of cellular RNA, transfer RNA follows, and messenger RNA is the smallest fraction because it is made as needed and degraded quickly. Placing DNA at the head reflects the paper's intent that the genome is the largest single nucleic acid component.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Ribonucleic Acid (RNA)
Ribonucleic acid is generally a single-stranded nucleic acid containing ribose and uracil instead of thymine. Coverage includes mRNA, tRNA and rRNA, complementary base pairing, transcription and translation, and the differences between RNA and DNA in structure, location and biological function.
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