Question

Where would you expect to find differences, in the structures of the proteins that are being made, or in the amount and timing of proteins being made when comparing two species that are closely related?  

Answer 1

The answer is :- Differences will be expected in the amount and timing of proteins being made.

Explanation :-

Proteins across different species varies vastly but most of the proteins which are related and Part of a family share the same function and thus have the same structure. Their overall sequence maybe different but active sites and motifs will be conserved and form a somewhat similar structure.

Meanwhile, protein expression is the driving force in the evolution. Proteins are made when they needed and in amount they are needed. One species may require some protein all the time while other species may not need the same protein all the time. Thus Their expression patterns will be different when compared between two species.