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#Tm

3 public questions tagged with this topic.

DNA

Which of the following causes a decrease in Tm?

Increasing AT content correctly describes the effect or change asked about in this question. In DNA, understanding cause-and-effect relationships is essential for predicting biological outcomes. Increasing AT content occurs because of specific molecular interactions, thermodynamic principles, or regulatory mechanisms that govern this biological process. The other options (Increasing GC content, Increasing ionic strength, and Decreasing pH) describe either opposite effects, effects that occur under different conditions, or changes associated with unrelated processes.

Ref: Molecular Biology of the Gene, Watson et al., 7th Ed.

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DNA

Which factor does NOT influence the DNA melting curve?

Base pair polarity is the correct choice because it does not accurately describe or belong to the category addressed in this question. In the context of DNA, the other options (GC content, pH, and Temperature) are all valid and well-established concepts. Base pair polarity is either unrelated to the topic, describes a different biological process, or represents a common misconception. Questions framed as 'which is NOT' require students to identify the exception among otherwise correct statements, demanding comprehensive knowledge of the topic rather than recognition of a single fact.

Ref: Molecular Biology of the Gene, Watson et al., 7th Ed.

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DNA

The melting temperature (Tm) of DNA depends on:

All of the above is the scientifically accurate answer to this question. Within the study of DNA, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of All of the above directly address what is being asked. Among the other options, GC content, Ionic strength, and pH do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Molecular Biology of the Gene, Watson et al., 7th Ed.

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