GCSE Edexcel Biology Combined Science Sub-cellular structures: Figure 1 shows a diagram of a re

Figure 1 shows a diagram of a red blood cell from a turtle and a diagram of a red blood cell from a human - Edexcel - GCSE Biology Combined Science - Question 1 - 2018 - Paper 1

Question 1

Figure-1-shows-a-diagram-of-a-red-blood-cell-from-a-turtle-and-a-diagram-of-a-red-blood-cell-from-a-human-Edexcel-GCSE Biology Combined Science-Question 1-2018-Paper 1.png

Figure 1 shows a diagram of a red blood cell from a turtle and a diagram of a red blood cell from a human. (i) These cells are animal cells. Animal cells do not ha... show full transcript

Worked Solution & Example Answer:Figure 1 shows a diagram of a red blood cell from a turtle and a diagram of a red blood cell from a human - Edexcel - GCSE Biology Combined Science - Question 1 - 2018 - Paper 1

Step 1

Identify which cells are animal cells.

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Answer

Animal cells do not have a cell wall (C). The correct answer is therefore C.

Step 2

Calculate the length of the magnified image of the red blood cell of the turtle when magnified 400×.

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Answer

To find the magnified length, we can use the formula:

ext{Magnified Length} = ext{Actual Length} imes ext{Magnification Factor}

Substituting the given values:

ext{Magnified Length} = 20.5 ext{ μm} imes 400 = 8200 ext{ μm} = 8.2 ext{ mm}

The length of the magnified image is 8.2 mm.

Step 3

Calculate the actual width of the cell and show your answer in standard form.

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Answer

To determine the actual width of the human red blood cell, we can also use the formula:

ext{Actual Width} = rac{ ext{Magnified Width}}{ ext{Magnification Factor}}

Using the given magnified width:

ext{Actual Width} = rac{3.08 ext{ mm}}{400} = 0.0077 ext{ mm} = 7.7 imes 10^{-3} ext{ mm}

The actual width of the cell is therefore $7.7 imes 10^{-3}$ mm.

Step 4

Give one safety precaution you need to take when handling animal tissue such as blood vessels.

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Answer

One safety precaution is to wear gloves to protect against contamination and potential pathogens.

Figure 1 shows a diagram of a red blood cell from a turtle and a diagram of a red blood cell from a human - Edexcel - GCSE Biology Combined Science - Question 1 - 2018 - Paper 1

Worked Solution & Example Answer:Figure 1 shows a diagram of a red blood cell from a turtle and a diagram of a red blood cell from a human - Edexcel - GCSE Biology Combined Science - Question 1 - 2018 - Paper 1

Identify which cells are animal cells.

Calculate the length of the magnified image of the red blood cell of the turtle when magnified 400×.

Calculate the actual width of the cell and show your answer in standard form.

Give one safety precaution you need to take when handling animal tissue such as blood vessels.

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