Question

For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 71.0kg adult receive?

Answer 1

Answer: There is 0.852 grams per day , 71.0 kg adult should receive.

Step-by-step explanation:

since we have given that

1 kg of body weight , the RDA of amino acid lysine = 12 kg per mg

So, we will use "Unitary Method":

For 71.0 kg of body weight , the RDA of amino acid  lysine is given by

$12\times 71=852\ mg\\\\\text{ As we know that }1\ g=1000\ mg\\\\852\ mg=\frac{852}{1000}\ g=0.852\ g$

Hence, there is 0.852 grams per day , 71.0 kg adult should receive.

Answer 2

Convert the given density in mg/kg to g/kg by the dimensional analysis. This is shown below,
                             (12 mg/kg) x (1 g/ 1000 mg) = 0.012 g/kg
Multiply this quantity with the weight of the adult given above,
                       (0.012 g/kg) x (71 kg) = 0.852 g
Thus, the adult should receive 0.852 g of lysine.