Bioch...Q1 - maryam2009

[ArchivalUser]

Several complexes in the mitochondrial electron transport chain contain non-heme iron.
The iron in these complexes is bound tightly to the thiol group of which amino acids?

A. Glutamine
B.Methionine
C.Cysteine
D.Tyrosine
E. Serine

[ArchivalUser]

i think its B

[ArchivalUser]

somehow I want to say cysteine, it's the only one has a thiol group(I think it is, isn't it?)

[ArchivalUser]

aa

[ArchivalUser]

sorry it is cysteine

[ArchivalUser]

The answer is C.

As lovetest mentioned:

Cystein has a sulfhydryl group......C–SH or R–SH thiol group in its side chain, and Methionine has a sulfur in its side chain, a methyl group is attached to it

http://www.biology.arizona.edu/biochemis...ulfur.html

[ArchivalUser]

Thanks.....

[ArchivalUser]

you are very welcome