Examination of the amino acid composition of a newly isolated protein indicates the presence of 10 lysines, 5 arginines, and 3 methionines. When the protein is treated with cyanogen bromide, four peptides are obtained. When it is treated with trypsin, 15 peptides are obtained. What do these results suggest regarding the sequence of the protein? A. The protein has a lysine or methionine at its C-terminal end. B. The protein is cyclic in nature with no free N or C-terminal ends. C. The protein has a lysine or arginine at its C-terminal end. D. The protein does not have lysine, arginine, or methionine at its C-terminal end.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg