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NTPC Graduate Tier 1 2025 Shift-2 📅 06 Jun, 2025

Which of the following best explains why uracil is used in RNA instead of thymine?

A
Uracil enhances RNA splicing.
B
Thymine is not recognized by ribosomes.
C
Thymine inhibits transcription.
D
Uracil is energetically cheaper to synthesise.
Result Summary
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APEDIA

NTPC Graduate Tier 1
2025 • 06 Jun, 2025 • Shift-2
Which of the following best explains why uracil is used in RNA instead of thymine?
Correct Answer
Uracil is energetically cheaper to synthesise.
Molecular Biology Principle: DNA utilizes thymine to ensure long-term genetic stability and prevent harmful mutations, whereas RNA acts merely as a short-lived ......
Ref/Book : NTPC Graduate Tier 1 2025
Ref. Subject General Awareness
Chapter -
Ref. Topic Biology
Pg. No -
💡 Analysis & Explanation
Molecular Biology Principle ▼
DNA utilizes thymine to ensure long-term genetic stability and prevent harmful mutations, whereas RNA acts merely as a short-lived messenger molecule carrying temporary instructions.
Evolutionary Economics ▼
Thymine is chemically produced by adding a methyl group to uracil, a process that requires a significant expenditure of cellular energy.
Functional Trade-off ▼
Because RNA is continuously produced and quickly degraded, the cell opts to conserve energy by using the non-methylated, cheaper building block (uracil) rather than wasting resources creating thymine for a temporary molecule.
Conclusion ▼
The metabolic cost makes uracil energetically cheaper to synthesize for temporary RNA strands.
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