In a UV-Vis spectrum, what does a peak at 260 nm typically indicate?

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Question: In a UV-Vis spectrum, what does a peak at 260 nm typically indicate?

Options:

Correct Answer: Nucleic acids

Solution:

A peak at 260 nm is characteristic of nucleic acids, particularly DNA and RNA.

In a UV-Vis spectrum, what does a peak at 260 nm typically indicate?

In a UV-Vis spectrum, what does a peak at 260 nm typically indicate?

Step 1: Understand what a UV-Vis spectrum is. It is a graph that shows how much light is absorbed by a sample at different wavelengths.
Step 2: Know that different substances absorb light at specific wavelengths. This helps identify what is in the sample.
Step 3: Recognize that 260 nm is a specific wavelength in the UV range.
Step 4: Learn that nucleic acids, like DNA and RNA, absorb light strongly at 260 nm.
Step 5: Conclude that if you see a peak at 260 nm in a UV-Vis spectrum, it usually means that nucleic acids are present in the sample.

UV-Vis Spectroscopy – The use of ultraviolet and visible light to analyze the absorption characteristics of substances.
Nucleic Acids Absorption – Nucleic acids, such as DNA and RNA, absorb UV light at specific wavelengths, with 260 nm being a key wavelength for their identification.