BIOCHEM EXAM 3 LECTURE 1 MCPHS
What is the final stage of cellular respiration and where does it happen
Correct Answer-Oxidative phosphorylation, in the mitochondria
What does oxidative phosphorylation couple Correct Answer-The oxidation
of NADH or FADH2 to the reduction of O2 to get H2O and...
BIOCHEM EXAM 3 LECTURE 1 MCPHS
What is the final stage of cellular respiration and where does it happen
Correct Answer-Oxidative phosphorylation, in the mitochondria
What does oxidative phosphorylation couple Correct Answer-The oxidation
of NADH or FADH2 to the reduction of O2 to get H2O and formation of ATP
Where in the mitochondria are the components of the respiratory chain
Correct Answer-Inner membrane
Briefly summarize the process of the respiratory chain Correct Answer-1.
Electrons flow through a chain of membrane-bound carriers
2. This results in protons (H+) pumped from matrix to inter membrane space
3. H+ gradient drives ATP synthesis
Electrons are transferred from a substrate to which universal electron acceptors
Correct Answer-NAD+, NADP+, FAD, FMN
NAD+ or NADP+ accepts what and releases what, how many electrons at once
Correct Answer-Accepts H- (H+ and 2 electrons), picks up a pair of electrons
at once, releases a proton
How many electrons can FAD or FMN accept and transfer at a time Correct
Answer-One or two electrons AT A TIME
What are the other sequentially acting electron carriers in the respiratory chain
besides NAD and flavoproteins Correct Answer-Hydrophobic quinone
(ubiquinone, Q), Cytochrome (contain iron), Iron-sulfur proteins
, BIOCHEM EXAM 3 LECTURE 1 MCPHS
Describe the characteristics of ubiquinone AKA Coenzyme Q [Q] Correct
Answer-Lipid-soluble, small, freely diffusible (can move around everywhere)
How many electrons can Q accept and what does it carry Correct Answer-
Accepts 1 or 2 electrons, carries a proton with each electron
What is the difference between ubiquinone (Q) and ubiquinol (QH2) Correct
Answer-Q is fully oxidized so it has no electrons, QH2 is fully reduced so it has 2
more electrons and H+ than Q
Cytochromes have how many classes and what distinguishes between them
Correct Answer-3 classes: a,b,c, different R groups differentiates between the
classes
What do all cytochromes have Correct Answer-An iron-containing heme
prosthetic group
The iron group in cytochromes can be in what two oxidative states Correct
Answer-Fe2+= has extra electron, and Fe3+= gives up electron
How are heme groups in cytochromes bound Correct Answer-Covalently or
non-covalently but either way, TIGHTLY BOUND
Cytochrome class a, b and some of c have what type of proteins Correct
Answer-Integral (inner membrane)
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