A transgenic cow gives 18 litres of milk in a day…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A transgenic cow gives litres of milk in a day. Each litre of the milk holds g of a human protein.
- How many grams of the protein are in the milk of one day?
- How many grams are in the milk of days?
- How many whole days of milk are needed to collect g of the protein?
Need a reminder? The key ideaShow
A transgenic animal has had its DNA manipulated to carry and express an extra, foreign gene. Over 95 per cent of existing transgenic animals are mice. They are made to study how genes work, as models of disease, to produce biological products, to test the safety of vaccines and to test the safety of chemicals. The first transgenic cow, Rosie, in 1997, made milk with human alpha-lactalbumin, 2.4 grams in every litre.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Milk: L in a day. Protein: g in each litre.
Plan. Find the protein of one day, then scale.
Step 1. One day. g.
Step 2. Ten days. g.
Step 3. One thousand grams. . After days there are g, which is not enough, so we need whole days.
Answer: g; g; days.
Check. g, which is more than g.
Source. The figure of g in each litre is the one that NCERT gives for the milk of Rosie. The litres a day is made up.
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