Practice Quiz 8 (TCA, electron transport chain)
You have 20 minutes to finish the quiz.
Q.1 :
Identify the mismatched pair
Krebs (TCA) cycle -- citrate
electron acceptor -- NAD
+
electron transport chain -- cytochrome
mitochondria -- matrix
no mismatched pair
Q.2 :
Which statement about the TCA cycle is false ?
CO
2
is formed
acetyl CoA is added to oxaloacetate
ATP is consumed
NADH is produced
Q.3 :
The energy generated in the citric acid cycle is used to
drive the reaction ADP + Pi to ATP.
reduce NAD+ to NADH.
reduce FAD to FADH2
all of the above
Q.4 :
In human cells (muscle cells), the fermentation process
is the major source for ATP
produces pyruvate
produces lactate
none of the above
Q.5 :
Water is a by-product of cellular respiration. The water is produced as a result of
the degradation of glucose to pyruvate.
ATP hydrolysis
the reduction of oxygen at the end of the electron transport chain
condensation reactions in the glucose metabolism
Q.6 :
The electron transport chain contains four large enzymes complexes. Some of the complexes
are involved in oxygen production
transport protons into the cristae
produce ATP from Pi and ADP
convert (reduce) NAD+ to NADH
Q.7 :
Which of the following statements is false
Complex I of the electron transport chain accepts electrons from NADH
the electrons are passed from complex IV of the electron transport chain to water
some of the electron carriers of the electron transport chain pump protons into the cristae
all are incorrect
Q.8:
Which of the following statements is false
the outer mitochodrial membrane is permeable to small molecules
the pH in the cristae has to be very acidic before ATP is formed
some ATP is formed in the Krebs cycle
all are correct
Q.9:
The carbon dioxide which we exhale is formed during
glycolysis
lactate fermentation
Krebs cycle
citrate formation
Q.10 :
Which statement about the mitochondria of brown fat cells is correct ? They
have no proton gradients
have no ATPase
can not use glucose as starting material for glycolysis
all of the above are correct
Q.11 :
One turn of the tricarboxylic acid cycle produces
NADH, FADH
2
, CO
2
NADH, FADH
2
H
2
O, ATP
NAD
+
, FAD, CO
2
, ATP, CO
2
NADH, FADH
2
, CO
2
, ATP
Q.12 :
After complete oxidation of glucose to CO
2
most of the energy is found in
ATP
FADH
2
and NADH
oxygen
heat generated
Q.13 :
As a result of limited oxygen supply to the mitochondria
glycolysis stops
there is a build up of NADH in the matrix
FAD accepts electrons from the electron transport chain instead of oxygen
ATP formation is not affected
Q.14 :
Dinitrophenol makes the inner mitochondrial membrane permeable to protons. Which statement is false?
the proton gradient is distroyed
oxygen consumption is not affected
TCA stops
ATP formation decreases significantly
Q.15 :
For each cycle of the TCA one molecule of acetyl CoA is needed. Which is not a precursor molecule for acetyl CoA
glucose
triglycerides (fatty acids)
protein (amino acids)
all are precursor molecules for acetyl CoA