8) In fatty acid oxidation, there is an enzyme that feeds electrons directly int
ID: 166197 • Letter: 8
Question
8) In fatty acid oxidation, there is an enzyme that feeds electrons directly into the respiratory electron transfer chain. This enzyme is:
a) B-hydroxyacyl-CoA dehydrogenase
b) Acyl-CoA dehydrogenase
c) Enol-CoA hydratase
d) Acyl-CoA acetyltransferase
9) Any oxidation reaction must be accompanied by a reduction reaction. During fatty acid oxidation, which of the following molecules or moieties is being reduced?
a) water
b) NAD+
c) CoEnzyme A
d) CO2
10) Figure 21-2 above shows one cycle of fatty acid synthesis. During the subsequent cycle two more carbons will be added. In the structures below, the two newly added carbons are denoted with an asterisk. Which structure accurately represents the growing fatty acid after one more cycle of synthesis?
11) Stearic acid is an 18 carbon fully saturated fatty acid. How many moles of NADH will be generated by breaking down one mole of stearic acid to acetyl CoA using the fatty acid oxidation pathway?
a) 6
b) 8
c) 9
d) 18
12) An example of secondary active transport would be:
a) Using ATP to drive the in-flow of K+ and the outflow of Na+ in the sodium potassium ATPase
b) Using ATP to drive the formation of a proton gradient via ATP synthase
c) Using a sodium gradient to drive uptake of glucose via a symporter
d) Using a proton gradient to drive ATP production in ATP synthase
tric acid cycle figure Palmitoyl CoA RADHa &course; ida 347794-1 e My ASU Colleges & Scho engthened by two carbonsExplanation / Answer
8. A
L-3-hydroxyacyl CoA is dehydrogenated again to create 3-ketoacyl CoA by 3-hydroxyacyl CoA dehydrogenase. This enzyme uses NAD as an electron acceptor.
9. C
NAD+ act as an electron acceptor and it is reduced to NADH.
10.
B
11. B
for every 2 carbons of your fatty acid you produce (kept in original production order):
1 FADH2
1 NADH
and 1 acetyl-CoA.
12. (C)
Secondary active transport, is transport of molecules across the cell membrane utilizing energy in other forms than ATP. This energy comes from the electrochemical gradient created by pumping ions out of the cell.
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