Please help!! Biochem 2c, Identify all of the protein complexes of the electron
ID: 135510 • Letter: P
Question
Please help!! Biochem
2c, Identify all of the protein complexes of the electron transport chain that catalyzed the formation of reduced coenzyme Q(QH2) choose all that apply
a, Complex 3 of the electron transport chain
b. Complex 2 of the electron transport chain
c. Complex 1 of the electron transport chain
d Complex 4 of the electron transport chain
2d Choose all of the following that are characteristics of electron transport chain. may have more than one answer. this question is refering to REDOX reaction in ETC Cyt means Cytochrome C in oxidized and reduced forms
a. high QH2/ Q and Cytochrome C reduced/ CytCoxidized ratios are a result of anaerobic conditions
b. Of Q, CytCox, and 1/2 O all accept electrons
c If QH2/Q and Cyt Cred/Cyt Cox ratios are high than NADH/NAD+ and FADH2/FAD ratios will be high in the matrix
d. Of NADH, FADH2, QH2 and CytoCred all but FADH2 donate electrons to electron transport chain
Explanation / Answer
(2c):----
(a) Complex 3: Consists of Dihydroubiquinone(UQH2):-- cytochrome-C Oxido-reductase, two forms of cytochrome b and non- heme iron sulpher(Fe-S) as well as cytochrome C1. These complex receives electrons from UQH2 and passes them to cytochrome -C.
(b). Complex 2:-- Consists of succinate dehydrogenase
(c). Complex 1:-- Consists of NADH-dehydrogenase
(d). Complex 4:--Consists of Cytochrome -C
2d):---
(b),(a) are the characteristics of ETS(Redox reaction)
Why these options have choose?
Explanation:---
. For b). these all are acceptor of protein or carriers
For a). There is no well perfect ETS or absence of Ets as in Eukaryotes(aerobic). So low NADH level, less reduction cause high level of QH2 and cytochrome.
Why not d),c) ?
In d). NADH is also electrons donor
In c). NADH will be in higher extent because they are electrons doners and cytochromes are carriers(multimeric proteins)