1. In Complex III of the mitochondrial electron transport chain, all of the b-type cytochrome subunits possess heme groups that are ____________ bound to the protein, and the iron atoms are coordinated by ___________.
a. noncovalently; histidine and methionine
b. noncovalently; two histidines
c. covalently; two histidines
d. covalently; histidine and methionine
2. In Complex III of the mitochondrial electron transport chain, all of the c- type cytochrome subunits possess heme groups that are ____________ bound to the protein, and the iron atoms are coordinated by ___________.
a. covalently; histidine and methionine
b. noncovalently; two histidines
c. noncovalently; histidine and methionine
d. covalently; two histidines
Solution
1. In Complex III of the mitochondrial electron transport chain, all of the b-type cytochrome subunits possess heme groups that are noncovalently bound to the protein, and the iron atoms are coordinated by two histidines.
Answer: b. noncovalently; two histidines
2. In Complex III of the mitochondrial electron transport chain, all of the c-type cytochrome subunits possess heme groups that are covalently bound to the protein, and the iron atoms are coordinated by two histidines.
Answer: d. covalently; two histidines
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1- In Complex III of the mitochondrial electron transport chain- all o.docx
1. 1. In Complex III of the mitochondrial electron transport chain, all of the b-type cytochrome
subunits possess heme groups that are ____________ bound to the protein, and the iron atoms
are coordinated by ___________.
a. noncovalently; histidine and methionine
b. noncovalently; two histidines
c. covalently; two histidines
d. covalently; histidine and methionine
2. In Complex III of the mitochondrial electron transport chain, all of the c- type cytochrome
subunits possess heme groups that are ____________ bound to the protein, and the iron atoms
are coordinated by ___________.
a. covalently; histidine and methionine
b. noncovalently; two histidines
c. noncovalently; histidine and methionine
d. covalently; two histidines
Solution
1. In Complex III of the mitochondrial electron transport chain, all of the b-type cytochrome
subunits possess heme groups that are noncovalently bound to the protein, and the iron atoms
are coordinated by two histidines.
Answer: b. noncovalently; two histidines
2. In Complex III of the mitochondrial electron transport chain, all of the c-type cytochrome
subunits possess heme groups that are covalently bound to the protein, and the iron atoms are
coordinated by two histidines.
