Podcast
Questions and Answers
Which enzyme is responsible for hydrolyzing alpha(1-6) glycosidic branching bonds of glycogen molecules?
Which enzyme is responsible for hydrolyzing alpha(1-6) glycosidic branching bonds of glycogen molecules?
Which type of iron is easily absorbed by the body?
Which type of iron is easily absorbed by the body?
In purine biosynthesis, which amino acid contributes carbon atoms at 4 and 5 positions and N at 7 position?
In purine biosynthesis, which amino acid contributes carbon atoms at 4 and 5 positions and N at 7 position?
What is the main characteristic of the disease Multiple sclerosis?
What is the main characteristic of the disease Multiple sclerosis?
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What is the end product of the reaction catalyzed by the enzyme thymidylate synthase?
What is the end product of the reaction catalyzed by the enzyme thymidylate synthase?
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Which tissue is not capable of using ketone bodies as an energy source?
Which tissue is not capable of using ketone bodies as an energy source?
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Amylase activity increases in the presence of which substance?
Amylase activity increases in the presence of which substance?
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Which enzyme is involved in galactose metabolism?
Which enzyme is involved in galactose metabolism?
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Which protein is required for de novo synthesis of glycogen?
Which protein is required for de novo synthesis of glycogen?
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Which of the following correctly describes the normal metabolism of bilirubin?
Which of the following correctly describes the normal metabolism of bilirubin?
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What is the primary source of blood glucose during a fasting state?
What is the primary source of blood glucose during a fasting state?
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The FADH2 and NADH2 produced by the oxidation of one acetyl-CoA result in the synthesis of about how many ATPs?
The FADH2 and NADH2 produced by the oxidation of one acetyl-CoA result in the synthesis of about how many ATPs?
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Which of the following statements concerning glucose metabolism is correct?
Which of the following statements concerning glucose metabolism is correct?
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Where is wall lipoprotein lipase immobilized on the surface of membranes?
Where is wall lipoprotein lipase immobilized on the surface of membranes?
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What is the first product in porphyrin biosynthesis in eucaryotes?
What is the first product in porphyrin biosynthesis in eucaryotes?
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Which of the following is NOT a product of the breakdown of heme?
Which of the following is NOT a product of the breakdown of heme?
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Study Notes
Glycogen Metabolism
- Glycogen branching enzyme hydrolyzes alpha(1-6) glycosidic branching bond of glycogen molecules.
- Glycogen phosphorylase is an enzyme responsible for glycogenolysis.
Iron Absorption
- Non-heme bound iron Fe2+ is easily absorbed.
Purine Biosynthesis
- Carbon atoms at 4 and 5 positions and N at 7 position are contributed by glycine.
- Glutamine contributes to purine biosynthesis.
Demyelination
- Multiple sclerosis is characterized by demyelination of nerves.
Nucleotide Metabolism
- d-UMP is converted to TMP by methylation.
- Pyrimidine biosynthesis begins with the formation of dihydroorotate from glutamine, ATP, and CO2.
Ketone Bodies
- All tissues, except RBC, can use ketone bodies.
- Cardiac muscle, brain, and renal cortex can use ketone bodies.
Enzyme Activity
- Amylase activity increases under the action of sodium chloride.
Gout
- Gout is characterized by increased plasma levels of uric acid.
Metabolic Pathways
- Reactions involved in the synthesis of ketone bodies are presented.
Galactose Metabolism
- UDP-Galactose 4-epimerase, galactose-1-phosphate uridyl transferase, and galactokinase are enzymes involved in galactose metabolism.
Enzyme Specificity
- Enzymes can be specific with respect to optical activity of the product formed, structure of the substrate, and type of reaction.
Glycogen Synthesis
- Hepatic glycogenolysis is a primary source of blood glucose during fasting state.
- Glycogenin is required for de novo synthesis of glycogen.
Pyrimidine Ring
- The two nitrogen atoms of the pyrimidine ring are contributed by aspartate and ammonia.
Bilirubin Metabolism
- Bilirubin is produced by the breakdown of heme, is transported to and conjugated in the liver, and is then secreted with other bile components into the small intestine.
ATP Synthesis
- The FADH2 and NADH2 produced by the oxidation of one acetyl-CoA result in the synthesis of about 11 ATPs.
Glucose Metabolism
- Pyruvate kinase catalyses an irreversible reaction.
- An elevated level of insulin leads to a decreased level of fructose 2,6-biphosphate in hepatocytes.
Lipoprotein Lipase
- Lipoprotein lipase is immobilized on the surface of membranes by heparin foot.
Porphyrin Biosynthesis
- Aminolevulinic acid, the first product in porphyrin biosynthesis in eucaryotes, is synthesized from succinyl CoA and glycine.
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Description
Test your knowledge of biochemistry with these multiple-choice questions. Topics include enzyme functions, iron absorption, and purine biosynthesis.
