Which of the following statements about the structure of messenger RNA is true?
A) mRNA is longer than DNA
B) mRNA consists of two polynucleotide strands
C) mRNA contains the nitrogenous base thymine
D) mRNA consists of a single polynucleotide strand
E) mRNA does not carry information for protein synthesis
IMAT 2026 · Question 32
Q32 - Structure of DNA and RNA
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The correct answer is D) mRNA consists of a single polynucleotide strand.
mRNA is a single-stranded copy of a gene. It carries the code from DNA to the ribosomes, where it is translated into protein.
A) Incorrect: mRNA is much shorter: it copies one gene, while a DNA molecule contains thousands of genes.
B) Incorrect: Two strands describes DNA.
C) Incorrect: In RNA, thymine is replaced by uracil.
D) Correct: mRNA is a single strand.
E) Incorrect: Carrying the information for protein synthesis is exactly what mRNA does.
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