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When an intermediate is formed between a substrate and an enzyme, this is called an enzyme-substrate complex.

When a molecule is bound to its respective transfer protein, (the molecule being transported is unchanged when released from the protein at the destination) would this be called a complex? If not, what would this be called?

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    Yes, it's a complex. Anything bound to anything else in biochemistry is a complex, especially when you're talking about proteins. The bonds need not be covalent, either. – MattDMo Nov 05 '16 at 19:41
  • The same way we call "receptor-ligand complex"; "transcription preinitiation complex", "nuclear pore complex" et cetera. The word 'complex' used in more-than one sense in biology; not always necessarily as co-ordination complex. – Always Confused Nov 06 '16 at 07:09
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