In a Mitochondrion, the TCA cycle can continue on indefinitely without a functio

Question

In a Mitochondrion, the TCA cycle can continue on indefinitely without a functioning electron transport chain.
a)True
b)False

Electron transfer can occure in the electron transport chain even when the pH gradient is abolished
a)True
b)False

The pH gradient established by the electron transport chain
a.) exists between the mitochondrial matrix and the mitochondrial intermembrane space
b.) sets up a voltage gradient that drives ATP formation
c.) is established by electron transfer from FADH2 and NADH to oxygen
d.) occurs because Fe-S clusters can only transport electrons, not protons
e.) all of the above
ATP in nitrogen fixation:
a.) Is provided by the host plant
b.) Directly drives the oxidation of Ferredoxin and reduction of Dinitrogenase reductase
c.) Is required because reduction of Dinitrogenase reductase by Ferredoxin is energetically
unfavorable
d.) Both a and c
e.) All of the above
Question #2:
Essential amino acids
a.) Are not made to sufficient levels in our bodies
b.) Must be obtained by eating other organisms, especially plants
c.) are a good illustration as to why it is better to eat other organisms besides only humans
d.) include amino acids such as tryptophan and phenylalanine
e.) all of the above
Question #3: (0.8 point)
Pyruvate is a precursor for which of these amino acids?
a.) A
b.) Q
c.) P
d.) G
e.) All of the above
Question #4: (0.8 point)
Formation of which amino acid represents the most common point for incorporation for NH4+ into
metabolism?
a.) Asp
b.) Cys
c.) Ser
d.) Gly
e.) Glu
Question #5:
Which statement about a diet rich in amino acids is true?
a.) It will give less energy than glucose because amino acids are often broken down to TCA
cycle intermediates
b.) The Urea Cycle will be required for removal of excess nitrogen released from amino acid
breakdown
c.) Requires energy in the form of ATP for removal of excess nitrogen in the Urea Cycle
d.) All of the above
e.) None of the above

Explanation / Answer

Pyruvate is a precursor for which of these amino acids? a. A Formation of which amino acid represents the most common point for incorporation for NH4+ into metabolism? e. Glu

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