Molecule 1 will denature at high temperatures
Molecule 1 strand with the highest G-C content of 70% will have a high denaturing temperature.G-C pair with 3 Hydrogen bonds while A-T pair with 2 hydrogen bonds. Therefore G-C bonds are stronger than A-T bonds in DNA double helices. G-C are therefore hard to break apart that A-T pairs.
Explanation:
In addition, non-coding regions of DNA have high G-C content. These parts are hard to into single strands, by DNA helicase, and are therefore lowly accessible to RNA polymerases for transcription. Highly transcribed genes are A-T rich.
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