Researchers have found that the nucleotide composition of structural RNAs (eg, tRNA, rRNA, other RNAs that show intra- and inter-strand hybridization) differs between thermophiles, which thrive at elevated temperatures, and mesophiles, which thrive at moderate temperatures. Compared with the structural RNA of mesophiles, the structural RNA of thermophiles most likely contains a higher proportion of:A.adenine and guanine nucleotides.B.adenine and uracil nucleotides.C.cytosine and uracil nucleotides.D.guanine and cytosine nucleotides.
Question
Researchers have found that the nucleotide composition of structural RNAs (eg, tRNA, rRNA, other RNAs that show intra- and inter-strand hybridization) differs between thermophiles, which thrive at elevated temperatures, and mesophiles, which thrive at moderate temperatures. Compared with the structural RNA of mesophiles, the structural RNA of thermophiles most likely contains a higher proportion of:A.adenine and guanine nucleotides.B.adenine and uracil nucleotides.C.cytosine and uracil nucleotides.D.guanine and cytosine nucleotides.
Solution
The structural RNA of thermophiles most likely contains a higher proportion of guanine and cytosine nucleotides.
Here's why:
RNA stability is crucial for organisms that thrive in high-temperature environments, such as thermophiles. Guanine (G) and cytosine (C) nucleotides form three hydrogen bonds, compared to the two formed between adenine (A) and uracil (U). This means that G-C pairs contribute more to the stability of the RNA molecule than A-U pairs. Therefore, it is reasonable to expect that the RNA of thermophiles, which need to maintain their structure and function at high temperatures, would have a higher proportion of G-C pairs compared to the RNA of mesophiles, which live at moderate temperatures.
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