The follow shows a protein pathway pathway.
The question is "where does galactose (GAL) first occur" i.e. which block above is galactose first contained in?
A transferase is defined as (wikipedia):
any one of a class of enzymes that enact the transfer of specific functional groups (e.g. a methyl or glycosyl group) from one molecule (called the donor) to another (called the acceptor)
This definition of transferase is confusing as:
- The question doesn't show any functional groups does it?
- From it, I can't figure out whether the galactose transferase is the molecule that is the donor or acceptor
I can't decide if galactose first occurs in S (as a donor) and is transfered into an acceptor upon reaching T, or if another donor forms galactose (as an acceptor) after S, causing T to contain galactose.