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Biochemistry Exam 4 Questions and Correct Answers
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Biochemistry Exam 4 Questions and Correct Answers
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Biochemistry Exam 4 QuestionsWhich coenzyme form is the reducing agent for fatty acid biosynthesis? - Answer -NADPH
What is the function of malonyl ACP in the biosynthesis of fatty acids? - Answer -To add two-carbon
units to the growing fatty acid chain
Muscle glycogen cannot be used to raise blood glucose levels because the muscles lack the enzyme... -
Answer -Glucose-6-phosphate
The reason saturated acyl residues generally occupy the 1 positions and unsaturated acyl residues the 2
positions of triacylglycerols and phospholipids is that: - Answer -the two acyl transferases involved in
phosphatidate biosynthesis exhibit different specificities toward saturated and unsaturated acyl-CoA
residues that serve as substrates
FADH2 is a less powerful reducing agent (electron donor) than NADH. What is the consequence of this in
oxidative phosphorylation? - Answer -A molecule of FADH2 is only capable of producing 1.5 molecules of
ATP, while a molecule of NADH is capable of producing 2.5 molecules of ATP
In the Cori Cycle, glucose produced in muscles is transported to the liver where it is converted to lactate
and returned to the muscles.. - Answer -FALSE
What is the source of energy for the synthesis of ATP in oxidative phosphorylation? - Answer -H+ flowing
through ATP synthase
, Which enzyme is NOT a control point, regulated by the cell's energy supply? - Answer -glucose-6-
phosphatase
What hydrolysis product of fats is converted into glyceraldehyde-3-phosphate so that it may enter the
glycolysis pathway? - Answer -Glycerol
What compound serves as the starting material for the biosynthesis of fatty acids and is also key in
intermediate in fatty acid metabolism? - Answer -Acetyl-CoA
Fatty acids must first be activated before undergoing beta-oxidation.. this activation involves the process
of.... - Answer -combination of the fatty acid with coenzyme A to yield fatty acyl CoA
In glycogen synthesis, glycogen synthase catalyzes the linking of glucose units to the going glycogen
chain by the formation of alpha(1-4) glycosidic bonds. what is the immediate source of glucose for this
reaction? - Answer -UDP-glucose
What is the fate of the acetyl CoA units produced by beta-oxidation of fatty acids when there is an
immediate need for energy? - Answer -entry into the citric acid cycle
Which products will result from the action of lipases on triacylglycerols? - Answer -Fatty acids and
glycerol
The hormone insulin stimulates which of the biochemical pathways.. - Answer -Glycogenesis and
Glycolysis
Term that describes the synthesis of glucose from non-carbohydrate sources? - Answer -
Gluconeogenesis
The activation of hormone sensitive lipase by glucagon involves the consumption of ATP. Which 2
enzymes involves in this regulation utilize ATP as a substrate? - Answer -Adenylate cyclase and Protein
Kinase A
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