Figure 3 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 have A cytoplasm B a cell membrane C a cell wall D mitochondria (ii) 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 ×. (iii) 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.

GCSE Edexcel Biology Sub-cellular structures: Figure 3 shows a diagram of a re

Figure 3 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 - Question 2 - 2018 - Paper 1

Question 2

Figure 3 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 3 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 - Question 2 - 2018 - Paper 1

Step 1

Animal cells do not have

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Answer

C a cell wall.

Animal cells, such as those from turtles and humans, possess a cytoplasm, a cell membrane, and mitochondria. However, they lack a cell wall, which is characteristic of plant cells.

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 length of the magnified image, we use the formula:

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

Substituting the known values:

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

Thus, the length of the magnified image is 8200 μm.

Step 3

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

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To find the actual width of the human red blood cell, we need to convert the magnified width back to its actual size:

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

Substituting the known values:

ext{Actual Width} = rac{3.08 ext{ mm}}{400} = 0.0077 ext{ mm}

To express this in standard form:

0.0077 ext{ mm} = 7.7 imes 10^{-3} ext{ mm}

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

Figure 3 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 - Question 2 - 2018 - Paper 1

Worked Solution & Example Answer:Figure 3 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 - Question 2 - 2018 - Paper 1

Animal cells do not have

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.

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