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Calculate how many grams of STZ should be injected into a rat with a mass of 230.45 g - AQA - A-Level Biology - Question 8 - 2022 - Paper 2

Question 8

Calculate how many grams of STZ should be injected into a rat with a mass of 230.45 g. Show your working. Give your answer in standard form.

Worked Solution & Example Answer:Calculate how many grams of STZ should be injected into a rat with a mass of 230.45 g - AQA - A-Level Biology - Question 8 - 2022 - Paper 2

Step 1

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Answer

The required dosage of STZ is 35 mg per kilogram of body mass (as given). First, we convert the rat's mass from grams to kilograms:

$230.45 ext{ g} = 0.23045 ext{ kg}$

Step 2

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Answer

Using the dosage per kilogram, we can calculate the total amount of STZ required:

$35 ext{ mg/kg} \times 0.23045 ext{ kg} = 8.08675 ext{ mg}$

Step 3

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Answer

Now, converting milligrams to grams gives:

$8.08675 ext{ mg} = 0.00808675 ext{ g}$

Step 4

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Answer

Finally, expressing this in standard form:

$0.00808675 ext{ g} = 8.08675 \times 10^{-3} ext{ g}$

Thus, the answer is approximately $8.09 \times 10^{-3} ext{ g}$ .

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