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To observe the fish gills with the optical microscope, the scientists used two different stains - AQA - A-Level Biology - Question 8 - 2022 - Paper 1

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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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104 rated

Answer

Haemoglobin could be the molecule that the stain binds to in red blood cells.

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