GCSE Edexcel Biology Combined Science Specialised cells: 1 (a) Figure 1 shows a diagram o

1 (a) 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

1-(a)-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

1 (a) 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 ... show full transcript

Worked Solution & Example Answer:1 (a) 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

These cells are animal cells.

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Answer

Animal cells do not have a cell wall. Therefore, the correct option is C.

Step 2

The actual length of the red blood cell from a turtle is 20.5 µm. Calculate the length of the magnified image of the red blood cell of the turtle when magnified 400×.

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Answer

To calculate the length of the magnified image, use the formula:

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

Substituting in the values:

ext{Magnified Length} = 20.5 ext{ µm} imes 400 = 8200 ext{ µm}.

Thus, the length of the magnified image of the turtle's red blood cell is 8200 µm.

Step 3

The width of the human red blood cell, when magnified 400×, is 3.08 mm. Calculate the actual width of the cell and show your answer in standard form.

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Answer

To find the actual width of the human red blood cell, we use the same formula:

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

Converting 3.08 mm to micrometers:

3.08 ext{ mm} = 3080 ext{ µm}.

Now, substituting the values:

ext{Actual Width} = rac{3080 ext{ µm}}{400} = 7.7 ext{ µm}.

In standard form, the answer is:

7.7 ext{ µm} = 7.7 imes 10^0 ext{ µm}.

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 prevent contamination and protect against potential pathogens.

1 (a) 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:1 (a) 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

These cells are animal cells.

The actual length of the red blood cell from a turtle is 20.5 µm. Calculate the length of the magnified image of the red blood cell of the turtle when magnified 400×.

The width of the human red blood cell, when magnified 400×, is 3.08 mm. 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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