To observe the fish gills with the optical microscope, the scientists used two different stains - AQA - A-Level Biology - Question 8 - 2022 - Paper 1
Question 8
To observe the fish gills with the optical microscope, the scientists used two different stains. The first stain binds to DNA; the second stain binds to the red bloo... show full transcript
Worked Solution & Example Answer:To observe the fish gills with the optical microscope, the scientists used two different stains - AQA - A-Level Biology - Question 8 - 2022 - Paper 1
Step 1
Explain why a second stain would be needed to stain the red blood cells.
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Answer
The first stain binds to DNA, which is not present in red blood cells as they do not have a nucleus. Therefore, a second stain is necessary to specifically target components found in red blood cells.
Step 2
Suggest which molecule the stain could bind to in the red blood cells.
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Answer
Haemoglobin could be the molecule that the stain binds to in red blood cells.
