3.1 Communicable diseases

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Question 24
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Willow bark is a traditional source of a chemical used to develop a well-known painkiller.

a.

Name the drug traditionally developed from the chemical extracted from willow bark.

[1]
b.

Table 1 shows information about the mass of salicylic acid found in different tissues of a healthy willow tree.

Table 1

Part of willow treeMass of salicylic acid in 100 g of tissue (g)
Outer bark2.4
Inner bark3.2
Twigs0.8

A drought-stressed willow tree has a physiological condition that limits its chemical production. The mass of salicylic acid found in the inner bark of this stressed tree is only 35% of the mass shown in Table 1.

Calculate the mass of salicylic acid in 250 g of this drought-stressed inner bark. Give your answer in mg.

[4]

3.1 Communicable diseases Questions

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