oxygen
carbonhydrate
energy
amino-acid
carbon dioxide
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From d question it is obvious dat protein can b broken down to amino acid bt d question is askin for another product.which is carboxylic group-carbohydrate-glucose-energy.
Kindly change this answer...it's not amino acid but energy. We do know that when protein is broken down amino acid is produced but now the question is what is ALSO produced...energy is also produced
We kw dat d end product of protein is amino acid but here d que says in breaking down of protein it also produces energy...yes in d liveR D GLUCOcorticosterois converts protein to glucose..dats my own deductions my school consider dis
if the ans should be energy,d question should be excess amino acid are further broken down to give what,and thats where energy comes in
This question is a little bit more discombobulating
It says when proteins are broken down they also provide....
1) when proteins are broken down what they provide is amino acids and energy
2) it is now when excess amino acids are broken down that UREA and A ketone group carbohydrate is produced which the urea is excreted by the kidneys
my opinion here is if I see this kind of questions i will just pick energy
this is my own opinion
if i am wrong anywhere
please correct me 
well...well..though it coming late....the question says."....they ALSO provide ....?carbohydrate will never provide amino acid..same with oil....ALSO there,I think it means the common end product of the classes of food....which I think should be ENERGY-C
The end product of protein digestion is amino acid but ...amino acids can be deanimated by the liver to form amine group(-NH2-) and carboxyl group(-COOH-) i.e it can form carbohydrate
OR something like...the unit of carbohydrate is Glucose, Fat and oil is fatty acids then protein will also provide..... then twill be Amino acids -D
