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WorksheetsLipid and Protein Metabolism
Total questions: 15
Worksheet time: 8mins
What is the basic order of events in the digestion and mobilization of dietary fats?
Degradation by lipases→ emulsified by bile→ incorporation into chylomicrons→ absorption and conversion into triacylglycerols
Degradation by lipases→ absorption and conversion into triacylglycerols→incorporation into chylomicrons→ emulsified by bile
Emulsified by bile→ degradation by lipases→ absorption and conversion into triacylglycerols→ incorporation into chylomicrons
Emulsified by bile→ incorporation into chylomicrons→ absorption and conversion into triacylglycerols→ degradation by lipases
Approximately how many molecules of ATP can be produced from the oxidation of a 20 carbon fatty acid, including those produced in the Krebs cycle?
107
100
129
136
What are the major products of amino acid catabolism?
Ketone bodies and tetrahydrofolate
Tetrahydrofolate and glycogen
Ketone bodies and glucose
Glucose and tetrahydrofolate
A deficiency of oxaloacetate would most likely increase the catabolism of what potential energy source?
Acetyl-CoA
Glucogenic amino acids
Ketogenic amino acids
Acetoacetyl-CoA
What chemical properties describe a free fatty acid molecule capable of producing the most energy when used as a fuel source, relative to other free fatty acids?
Shorter hydrocarbon tail with a greater number of unsaturated bonds
Longer hydrocarbon tail with a greater number of unsaturated bonds
Longer hydrocarbon tail with a lesser number of unsaturated bonds
Shorter hydrocarbon tail with a lesser number of unsaturated bonds
What is the rate limiting step in the production of energy from free fatty acids?
Degradation of acetyl-CoA to enter the Krebs cycle
Carnitine acyl-transferase activity
β-oxidation within the mitochondrial matrix
Dehydrogenation of fatty acyl-CoA
What is lipolysis?
Hydrolysis of triacylglycerol
Formation of lipids
Breakdown of ketone bodies
Formation of ketone bodies
Which of the following hormone is not used in the hydrolysis of triacylglycerol into the fatty acids in adipose tissues?
Epinephrine
Norepinephrine
Glucagon
Insulin
Name the energy source of the brain during starvation.
Fat
Ketone bodies
Protein
Lipids
In which form the nitrogen is incorporated into an amino acid?
Nitrite
Glutamate
Nitrate
Ammonium ion
Transamination reaction in amino acid synthesis is catalyzed by enzyme_________.
Nitric oxide synthase
Decarboxylase
Aminotransferase
Glutamate decarboxylase
Intermediates of which of the following metabolic pathway have not been used in the synthesis of amino acids?
Glycolysis
Fatty acid biosynthesis
Citric acid cycle
Pentose phosphate pathway
Name the amino acid which does not take part in transamination during amino acid catabolism.
Proline
Threonine
Lysine
Serine
Products of urea cycle
1 urea, 1 NH3, 1 ATP, 1 fumaric acid
1 urea, 1 AMP, 2 ADP, 1 fumaric acid
1 aspartic acid, 1 NH3, 1 ATP, 1 fumaric acid
2 urea, 2 NH3, 1 ATP, 1 fumaric acid
Insulin is a hormone that inhibits lipolysis. Glucagon is a hormone that promotes lipolysis.
1st statement is true
2nd statement is true
Both statements are true
Both statements are false
