Final answer:
Alexa 555 is conjugated to antibodies, used to detect proteins in cells, and emits red fluorescence. This tool is essential in fluorescence microscopy to study cellular structures.
Step-by-step explanation:
Alexa 555 is conjugated to antibodies and allows you to visualize the location of proteins and will fluoresce red. This method is used in fluorescence microscopy, a powerful technique that employs fluorescent tags to label specific molecules within cells. Different fluorophores attach to various cellular structures and upon illumination with UV light emit light at different wavelengths visible through a fluorescence microscope.
For example, DNA can be labeled with a fluorescent dye, allowing its visualization under UV light. However, when we specifically mention Alexa 555 it is typically conjugated to antibodies targeting proteins and when excited with the appropriate wavelength of light the compound emits red fluorescence.