Question 161 ptsFluorescence microscopy is widely used for labelling nerve cells. What advantage does fluorescence have over “normal” staining (i.e., using opaque or coloured dyes)?Group of answer choicesit is brighter than normal stainingit gives better contrast than normal stainingit is cheaper than normal stainingit gives better resolution than normal stainingit is less technically demanding than normal staining

Fluorescence microscopy has several advantages over "normal" staining methods, but the main advantage is that it gives better contrast than normal staining.

Here's why:

1. Specificity: Fluorescent dyes can be attached to specific molecules or structures within a cell, allowing for precise labeling and visualization. This is not always possible with traditional staining methods.

2. Multiple labeling: Fluorescence microscopy allows for multiple labels to be used at once, each emitting a different wavelength of light. This means that multiple structures or molecules can be visualized and differentiated at the same time.

3. Dynamic imaging: Fluorescent labels can be used in live cells, allowing for real-time, dynamic imaging of cellular processes. Traditional stains often require cells to be fixed or killed.

4. High contrast: Because the background is dark and only the labeled structures emit light, fluorescent microscopy provides high contrast images.

So, the correct answer is "it gives better contrast than normal staining".