The graph shows the relationship between the number of T lymphocytes and the number of HIV particles present in the blood of an infected individual over a 6-year period - Scottish Highers Human Biology - Question 24 - 2022
Question 24
The graph shows the relationship between the number of T lymphocytes and the number of HIV particles present in the blood of an infected individual over a 6-year per... show full transcript
Worked Solution & Example Answer:The graph shows the relationship between the number of T lymphocytes and the number of HIV particles present in the blood of an infected individual over a 6-year period - Scottish Highers Human Biology - Question 24 - 2022
Step 1
A. The ratio of T lymphocytes to HIV particles at year 4 is 1:21.
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Answer
To establish the ratio at year 4, examine the graph. At year 4, T lymphocyte levels approximate 800, while HIV particles level at around 8000. Therefore, the ratio is calculated as:
This statement is correct since the ratio does not equal 1:21.
Step 2
B. The HIV particle number increased fastest between years 2 and 3.
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Answer
Inspecting the graph shows that the increase in HIV particles between years 2 and 3 is indeed steep, indicating rapid growth. Therefore, this statement is correct.
Step 3
C. The T lymphocyte number decreases continuously over the 6-year period.
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Answer
The graph indicates fluctuations in T lymphocyte numbers, with periods of decrease and stability. Thus, the T lymphocyte count does not continuously decrease, making this statement incorrect.
Step 4
D. The HIV particle number is always higher than the T lymphocyte number.
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Answer
From the graph, it is clear that at various points, especially noted at year 4, the HIV particle count does exceed the T lymphocyte count. Although this generally holds true, since the question specifies 'always,' it requires careful interpretation. This statement is correct.
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