The Following Statements About Superfamily Proteins are True EXCEPT That

Question

The following statements about superfamily proteins are true EXCEPT that
A) ABC (ATP-binding cassette) transporters serve as an example.
B) proteins with structural and functional similarity but low sequence homology may be considered superfamilies.
C) superfamily proteins are encoded by genes found on superfamily islands.
D) superfamily proteins are encoded by genes that have been duplicates and then mutated.
E) proteins such as HSP70 that are found in all domains of life are examples.

Accepted Answer

Superfamily proteins are not necessarily encoded by genes found on superfamily islands. This statement is false. Superfamily proteins are defined by their structural and functional similarities, which can be present even if there is low sequence homology. ABC transporters, HSP70, and the process of gene duplication and mutation are all examples of superfamily proteins or characteristics of them.