Part B. For adults, the RDA of the amino acid lysine is 12 mg per kg of body wei

Question

Part B.

For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 74 kg adult receive?

Express your answer using two significant figures. Please show your work!

Part C.

A typical multivitamin tablet can contain 2.0 mg of vitamin B2 (riboflavin), and the RDA is 0.0030 g/day . How many such tablets should a person take each day to get the proper amount of this vitamin, assuming that he gets none from any other sources?

Express your answer as an integer. Show your work!

Part D.

The RDA for the trace element selenium is 0.000070 g/day . Express this dose in mg/day .

Express your answer using two significant figures.Show your work!

Explanation / Answer

Part B -

As we know -

1000 mg = 1 gram
Given that, if someone weighed 1 kg, they would need 12mg of lysine daily.
Then that means, a 74 kg adult would need 74 x 12 mg = 888 mg of lysine daily, which is 0.888 grams.

Part C -

2 mg = 2/1,000 grams
0.003g = 3/1,000 grams
0.003/0.002 = 1.5 tablets.

This can be approximated to 2 tablets per day.

Part D -

1 g = 1000 mg

so, 0.000070 g = 0.000070 x 1000 = 0.07 mg

so, the dose is 0.07 mg/day.

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