Proteins and Non-protein Nitrogen Compoounds Final Examination 2019

Ceruloplasmin is an alpha 1 globulin that binds copper. This means that ceruloplasmin has the ability to bind and transport copper ions in the body. Copper is an essential mineral that plays a crucial role in various physiological processes, including the formation of red blood cells, energy production, and the function of the immune system. Ceruloplasmin helps to regulate copper levels in the body, ensuring that it is properly utilized and transported to where it is needed.

In the Jaffe reaction, a red-orange chromogen is formed when creatinine reacts with picric acid. This reaction is commonly used to measure the concentration of creatinine in biological samples, such as urine. Picric acid reacts with creatinine to form a red-orange complex, which can be easily measured spectrophotometrically. This reaction is based on the ability of picric acid to react with the amino group of creatinine, resulting in the formation of the chromogen. The intensity of the color produced is directly proportional to the concentration of creatinine in the sample.

Lesch-Nyhan syndrome is caused by a complete deficiency of hypoxanthine guanine phosphoribosyltransferase (HGPRT), an enzyme involved in the salvage pathway of purine metabolism. This deficiency leads to the accumulation of uric acid and the development of severe neurological symptoms, including self-mutilation, intellectual disability, and spasticity. Therefore, the correct answer is Lesch-Nyhan syndrome.

Smoking cigarettes can cause an increase in ammonia levels in the blood. This is because tobacco smoke contains chemicals that can lead to the breakdown of proteins in the body, resulting in the release of ammonia. Therefore, if the patient had two cigarettes 15 minutes prior to the blood draw, it could lead to a false increase in ammonia levels.

The conversion of blood urea nitrogen to urea is 2.14.

Haptoglobin is a glycoprotein that binds with hemoglobin in order to facilitate its removal by the reticuloendothelial system. This process is important for the clearance of free hemoglobin from the bloodstream, preventing its accumulation and potential damage to tissues. Haptoglobin acts as a scavenger, binding to hemoglobin released from damaged red blood cells and forming a complex that can be recognized and cleared by cells of the reticuloendothelial system.

In nephrotic syndrome, there is increased permeability of the glomerular filtration barrier, leading to excessive loss of protein in the urine. This results in higher than normal levels of protein in the urine.

The correct answer is that the protein electrophoretic pattern of plasma, as compared with serum, reveals a fibrinogen peak between the beta and gamma globulins. This means that when analyzing the protein composition of plasma using electrophoresis, a distinct peak for fibrinogen can be observed between the beta and gamma globulins. This peak indicates the presence of fibrinogen, a protein involved in blood clotting, and helps to differentiate plasma from serum, which does not contain fibrinogen.

Adsorption with Lloyd's reagent can enhance the specificity of the Jaffe reaction. Lloyd's reagent is a substance that can selectively bind to certain compounds, in this case, it can specifically bind to interfering substances that may be present in the sample. By adsorbing these interfering substances, they are removed from the sample, allowing for a more accurate and specific measurement of the analyte of interest. This improves the reliability and accuracy of the Jaffe reaction for detecting the target compound.

Protein compounds contain approximately 16% nitrogen because nitrogen is an essential component of amino acids, which are the building blocks of proteins. Amino acids contain both carbon and nitrogen atoms, and when they combine in a specific sequence, they form proteins. The nitrogen content in proteins is essential for various biological processes, including growth, repair, and the synthesis of enzymes and hormones. Therefore, it is true that protein compounds contain approximately 16% nitrogen.

Bromcresol green is an anionic dye that selectively binds with albumin. This dye-binding method allows for the quantitation of albumin in serum without the need for preliminary extraction of globulins. By using bromcresol green, the albumin can be specifically measured without interference from other proteins.

Albumin is a protein that is primarily produced in the liver. It is the most abundant protein in the blood plasma and plays a crucial role in maintaining oncotic pressure and transporting various substances such as hormones, drugs, and fatty acids. It is also responsible for regulating fluid balance in the body. Therefore, the statement "It is produced in the liver" is true.

Alpha-1 antitrypsin is an acute phase reactant protein that is able to inhibit enzymatic proteolysis. It is one of the plasma proteolytic inhibitors and is known to have a high concentration among them. C-reactive protein is also an acute phase reactant protein, but it does not have a high concentration among the plasma proteolytic inhibitors. Alpha-2 antichymotrypsin and alpha-2 macroglobulin are also acute phase reactant proteins, but they are not specifically known for inhibiting enzymatic proteolysis. Therefore, the correct answer is alpha-1 antitrypsin.

Ammonia concentration is usually measured to evaluate hepatic encephalopathy. Hepatic encephalopathy is a condition that occurs when the liver is unable to remove toxins, including ammonia, from the blood. Elevated ammonia levels can lead to neurological symptoms such as confusion, disorientation, and even coma. Therefore, measuring ammonia concentration is important in diagnosing and monitoring hepatic encephalopathy.

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Scharlach R is not a specific stain for proteins, unlike the other three options. Ponceau S, Amido black, and Coomassie brilliant blue are commonly used stains to visualize and detect proteins in various laboratory techniques such as Western blotting and protein gel electrophoresis. However, Scharlach R is not commonly used for protein staining and is more commonly used as a dye for textiles.

The Kjeldahl technique is used to determine the nitrogen content of proteins. This method involves digesting the protein sample with sulfuric acid, which converts the nitrogen in the protein into ammonium sulfate. The ammonium sulfate is then converted into ammonia by adding sodium hydroxide. The amount of ammonia produced is then measured using titration. Since proteins contain a known amount of nitrogen, the nitrogen content can be used to calculate the protein concentration in the sample. Therefore, the Kjeldahl technique is based on the quantitation of the nitrogen content of protein.

IgG is not manufactured by the liver. IgG is an immunoglobulin that is produced by plasma cells in the immune system. It is one of the five main types of antibodies and is involved in immune responses against pathogens. The liver is responsible for producing other plasma proteins such as albumin, haptoglobin, and fibrinogen.

Multiple myeloma is considered as a monoclonal gammopathy because it is a type of cancer that arises from plasma cells in the bone marrow. In multiple myeloma, abnormal plasma cells produce an excess amount of a specific type of antibody called a monoclonal protein or M protein. This monoclonal protein can be detected in the blood or urine of patients with multiple myeloma. The presence of this abnormal protein is a characteristic feature of the disease and distinguishes it from other conditions such as neurosyphilis, multiple sclerosis, and leukemia.

The intensity of the color produced in the biuret reaction is dependent on the number of peptide bonds. This is because the biuret reagent reacts with peptide bonds in proteins to form a purple-colored complex. The more peptide bonds present in a protein, the more intense the color will be, indicating a higher concentration of proteins in the serum sample. Therefore, the number of peptide bonds is a crucial factor in the quantitation of serum total proteins using the biuret procedure.

Wilson's disease is a genetic disorder that causes copper to accumulate in the body, leading to various symptoms and organ damage. In this disease, the copper levels in the body are elevated, as the body is unable to properly excrete it. However, the levels of ceruloplasmin, a protein that carries copper in the blood, are low. This is because Wilson's disease impairs the liver's ability to produce ceruloplasmin, resulting in decreased levels of this protein. Therefore, the correct description of Wilson's disease according to copper and ceruloplasmin levels is elevated copper levels and low ceruloplasmin levels.

In cases of hepatoma, α1-fetoprotein is synthesized by liver cells. This protein is not normally found in adult serum, but its presence can be detected in the blood of individuals with hepatoma.

Monosodium urate may deposit and accumulate in the synovial fluid, serum, and urine. This is commonly seen in conditions like gout, where there is an accumulation of uric acid crystals in the joints, causing inflammation and pain. The deposition of monosodium urate in the synovial fluid leads to the formation of tophi, which are lumps that can be felt under the skin. Uric acid can also be found in the bloodstream (serum) and can be excreted in the urine.

In acute kidney injury, the kidneys are unable to properly function and secrete waste products, leading to their retention in the blood. This is the reason for the increased nonprotein nitrogen compounds (NPNs) in the blood. The other options do not accurately explain the cause of the increased NPNs.

Acute phase reactant proteins are proteins that are produced by the liver in response to inflammation or infection. They help to modulate the immune response and promote tissue repair. Transferrin, however, is not considered an acute phase reactant protein. Transferrin is a protein that is involved in iron transport and is not directly involved in the acute phase response.

Bromcresol purple is the preferred indicator for the albumin dye binding technique because it has less interference from the pigment. This means that it provides a more accurate and reliable measurement of albumin levels in a sample. Other indicators may be affected by the presence of pigments, which can lead to inaccurate results. Therefore, bromcresol purple is the preferred choice as it minimizes the potential for interference and ensures the most precise measurement of albumin levels.

In the Kreb's Henseleit cycle, the first step involves the reaction of CO2 and NH4+ to form carbamoyl phosphate. This carbamoyl phosphate then combines with ornithine to form citrulline. Therefore, the combination of ornithine and carbamoyl phosphate is the product of this reaction.

The Kjeldahl method is the reference method for measuring proteins. This method involves the digestion of the protein sample with sulfuric acid and the subsequent determination of the nitrogen content in the sample. Since proteins contain about 16% nitrogen, the amount of nitrogen can be used to calculate the protein content. The Kjeldahl method is widely used and accepted as a standard for protein analysis due to its accuracy and reliability.

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IgM and Fibrinogen are not normally found in cerebrospinal fluid (CSF). IgM is an immunoglobulin that is too large to cross the blood-brain barrier and therefore is not present in CSF. Fibrinogen is a protein involved in blood clotting and is also too large to pass through the blood-brain barrier. Albumin and Pre-albumin, on the other hand, are normally found in CSF. Therefore, the correct answer is A & B.

The biuret reaction involves the formation of complexes between cupric ions and peptide bonds in a protein. The intensity of the color produced in this reaction is dependent on the number of these complexes formed. In order for the reaction to take place, there must be at least 2 peptide bonds present.

When a protein is dissolved in a buffer solution with a pH more alkaline than its isoelectric point (pI), it will have a net negative charge. When an electric current is passed through the solution, the protein will act as an anion and migrate towards the anode, which is the positively charged electrode. This is because opposite charges attract each other, causing the negatively charged protein to move towards the positively charged electrode.

When a buffer solution at pH 8.6 is used in serum protein electrophoresis, the proteins will have a net negative charge. This is because at pH 8.6, the solution is more alkaline and has a higher concentration of hydroxide ions (OH-). The hydroxide ions will interact with the proteins, causing them to lose hydrogen ions (H+) and become negatively charged. As a result, the proteins will migrate towards the cathode, which is the positively charged electrode, in the electrophoresis process.

Alpha 1 anti-chymotrypsin is used as a marker for Alzheimer's disease. This protein is found in the brain and its levels have been found to be elevated in individuals with Alzheimer's disease. It is believed that this protein plays a role in the development and progression of the disease. Therefore, measuring the levels of alpha 1 anti-chymotrypsin can help in the diagnosis and monitoring of Alzheimer's disease.

Alpha 1 globulins are a group of proteins that are classified based on their migration pattern during electrophoresis. Lipoproteins, Fetoprotein, and Anti-trypsin are all classified as alpha 1 globulins. Therefore, the correct answer is I, IV, V.

The first statement is true because C-reactive protein does indeed increase significantly during inflammation. However, the second statement is false because Menke's kinky hair syndrome is actually characterized by low levels of copper in the body, not increased levels.

Trichloroacetic acid is used to precipitate proteins in the Turbidimetric method. This reagent causes proteins to denature and aggregate, leading to their precipitation.

Macroglobulin is the largest protein in the plasma, which aligns with statement (I). Ceruloplasmin is a copper-containing protein that gives a blue color to proteins, which aligns with statement (II). Therefore, the correct answer is (I) Macroglobulin; (II) Ceruloplasmin.

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Urine protein electrophoresis is commonly used to identify Bence Jones protein. Bence Jones protein is a monoclonal immunoglobulin light chain that is produced by plasma cells in certain types of plasma cell dyscrasias, such as multiple myeloma. It can be detected in the urine of affected individuals and its presence can be indicative of these conditions. This test helps in diagnosing and monitoring the progression of these diseases. Alpha 2 macroglobulin, albumin, and myelin basic protein are not typically identified using urine protein electrophoresis.

C-reactive protein is not a transport protein. Transferrin, ceruloplasmin, and albumin are all examples of transport proteins. Transferrin is responsible for transporting iron in the blood, ceruloplasmin transports copper, and albumin carries various substances such as hormones, fatty acids, and drugs. C-reactive protein, on the other hand, is an acute-phase protein that is produced in response to inflammation in the body. It is not involved in the transport of substances.

The immunofixation protein electrophoresis revealed monoclonal bands of the IgG type. This finding is consistent with the most common type of multiple myeloma, which is characterized by the proliferation of plasma cells that produce excessive amounts of monoclonal IgG antibodies. The presence of monoclonal bands indicates clonal expansion of a single population of plasma cells, while the IgG type suggests the specific class of immunoglobulin being produced. This information is valuable for diagnosing and monitoring multiple myeloma.

The given pattern of serum protein electrophoresis with decreased albumin and increased A1 and A2 globulins is characteristic of acute inflammation. Inflammation causes a decrease in albumin production and an increase in acute phase reactant proteins, such as A1 and A2 globulins. The gamma globulins, which include immunoglobulins, remain normal in acute inflammation. Therefore, the correct answer is acute inflammation.

The biuret reaction is a biochemical test used to detect the presence of proteins in a sample. It involves the reaction between copper ions and peptide bonds in proteins, resulting in a color change. The given statement suggests that the biuret reaction is relatively free from interference by lipids and hemoglobin. This means that lipids and hemoglobin do not significantly affect the accuracy of the test results. However, this statement is not true. Lipids and hemoglobin can interfere with the biuret reaction and lead to inaccurate protein measurements.

The correct answer is C --> S --> F --> A. This pattern suggests that when hemoglobin variants are separated using electrophoresis at a pH of 8.6, the C variant will migrate first, followed by the S variant, then the F variant, and finally the A variant.

Uric acid is a waste product that is normally excreted through urine. When there is an excessive amount of uric acid in the urine, it can crystallize and form kidney stones, also known as renal calculi. A uric acid level of greater than 10 mg/dL indicates a high concentration of uric acid in the urine, increasing the risk of kidney stone formation. Therefore, a uric acid level of >10 mg/dL is more likely to cause the formation of renal calculi compared to lower levels.

Denaturation of proteins refers to the alteration in the tertiary (3o) structure of the protein. This can occur due to various factors such as mechanical agitation, heat, or extreme chemical treatment. The 3o structure of a protein is the overall three-dimensional arrangement of its secondary structures, and denaturation disrupts this arrangement. It does not involve the alteration of the primary (1o) structure, which refers to the sequence of amino acids in the protein, or the breaking of a peptide bond.

The net charge of a protein under its isoelectric point is zero. The isoelectric point is the pH at which the protein has no net charge because the number of positive and negative charges on the protein are equal. At a pH below the isoelectric point, the protein will have a net positive charge, and at a pH above the isoelectric point, the protein will have a net negative charge. However, at the isoelectric point, the protein is electrically neutral.

Multiple myeloma is a type of cancer that affects plasma cells, which are a type of white blood cell. It is characterized by the production of abnormal plasma cells that produce excessive amounts of a protein called paraprotein or M protein. This overproduction of paraprotein can lead to a variety of symptoms and complications. Additionally, multiple myeloma can also result in the overproduction of immunoglobulin G (IgG), which is a type of antibody produced by plasma cells. Therefore, all of the given statements accurately describe multiple myeloma.

Uric acid is the final product of purine metabolism. Purines are nitrogenous compounds that are broken down into uric acid through a series of enzymatic reactions. This process occurs in the liver and results in the production of uric acid, which is then excreted by the kidneys. Purine metabolism is important for the regulation of uric acid levels in the body, and abnormalities in this pathway can lead to conditions such as gout.