AP Biology 1.6 A Describe the Structure and Function of Dna and Rna Questions

Practise AP Biology 1.6.A questions by linking DNA charge, backbone bonds, helix evidence and base composition to molecular structure and laboratory data.

Exam points

interpret DNA charge and fragment size in a comet-assay or electrophoresis context
calculate DNA melting temperature from base composition and identify helix evidence

[Maximum number: 1]

One method for predicting the average temperature (in °C) at which a short DNA molecule binds with its complement is to calculate a melting temperature ( $\mathrm{T}_{\mathrm{m}}$ ) using the following formula.

\mathrm{T}_{\mathrm{m}}=4(\mathrm{G}+\mathrm{C})+2(\mathrm{~A}+\mathrm{T})

Using the formula, what is the predicted $\mathrm{T}_{\mathrm{m}}$ for the short single-stranded DNA molecule shown above?

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AP Biology 1.6 A Describe the Structure and Function of Dna and Rna Questions question 1