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BCH 369 EXAM PREP WITH COMPLETE SOLUTIO
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BCH 369 EXAM PREP WITH COMPLETE SOLUTIO
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BCH 369 EXAM PREP WITH COMPLETESOLUTION
Catabolism of ______ results in the formation of β-alanine or β-aminoisobutyrate.
A) purines B) pyrimidines C) both purines and pyrimidines - =B) pyrimidines
Which chemical group is present on the PLP cofactor that is not found on any amino acid side
chain? A) aldehyde B) ketone C) hydroxyl D) amide E) imidazole - =A) aldehyde
Which of the molecules listed below DIRECTLY donates a nitrogen atom for the formation of
urea
during the urea cycle? A) creatine B) aspartate C) glutamate D) arginine E) adenine - =B)
aspartate
Mammalian cells derive chemical energy from a variety of "fuel" molecules which are delivered
to them in the bloodstream. Which one of the following is NEVER taken up as a fuel molecule
from
the bloodstream? A) Glucose B) Fatty acids C) Lactate D) Acetyl-CoA E) Acetoacetate - =D)
Acetyl-CoA
Which of the following is an important physiological role of bile salts?
A) They assist in the excretion of phospholipids.
C) They assist in the digestion of lipoproteins.
B) They assist in the digestion of lipids.
D) They assist in the excretion of proteins. - =B) They assist in the digestion of lipids.
Insulin is produced by liver cells known as hepatocytes.
A) True B) False - =B) False
, In which cellular compartment are ketone bodies synthesized?
A) Mitochondrial intermembrane space.
C) Inner mitochondrial membrane.
B) Mitochondrial matrix.
D) Cytosol. - =B) Mitochondrial matrix.
Which of the following is correct regarding the conversion of 3-hydroxy-3-methylglutaryl-CoA
(HMG-CoA) to mevalonate?
A) This reaction requires NADPH.
B) This reaction is regulated by cholesterol.
C) This is a key reaction in the synthesis of compounds that contain isoprenoid units.
D) A and B are correct.
E) A, B and C are correct. - =E) A, B and C are correct.
A molecule that signals vasodilation is _____, which is synthesized from the precursor _____.
A) nitric oxide (NO), arginine
D) nitrous oxide, citrulline
B) nitrous oxide, arginine
E) none of the above
C) nitric oxide (NO), citrulline - =A) nitric oxide (NO), arginine
During fuel abundance, excess ____ is (are) catabolized to acetyl-CoA , which is used in fatty
acid
synthesis. A) glucose B) amino acids C) nucleotides D) A and B E) A, B and C - =D) A and B
Which of the following sets of molecules is required prior to the β-oxidation of a fatty acid?
A) ATP, citrate and coenzyme A.
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