Chemistry Study Questions

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  • 1/244 Questions

    98.6 degree F of body temperature is the same as:

    • 37 degrees C
    • 32 degrees C
    • 20 degrees C
    • 100 degrees C
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Chemistry Study Questions - Quiz
About This Quiz

The 'Chemistry Study Questions' quiz assesses key analytical skills, focusing on calculations and preparations essential in chemistry. It covers topics such as mean calculation, solution dilutions, molarity, and weight measurements for chemical preparations, suitable for students and professionals.

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  • 2. 

    A gray specimen collection tube contains which additive?

    • Heparin

    • Fluoride

    • EDTA

    • Citrate

    Correct Answer
    A. Fluoride
    Explanation
    The correct answer is fluoride. A gray specimen collection tube is typically used for glucose testing, and it contains an additive called fluoride. This additive helps to prevent the breakdown of glucose in the blood sample, allowing for more accurate glucose measurements.

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  • 3. 

    The most commonly used oil immersion lens magnifies:

    • 4x

    • 45x

    • 100x

    • 10x

    Correct Answer
    A. 100x
    Explanation
    The most commonly used oil immersion lens magnifies at 100x. Oil immersion is a technique used in microscopy to improve resolution and clarity. By immersing the lens in oil with a similar refractive index as the specimen, light can pass through without being refracted, resulting in sharper images. The 100x magnification allows for high-resolution viewing of microscopic details, making it a commonly used lens in scientific research and medical diagnostics.

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  • 4. 

    Calculate the mean of the following set of data. 12, 10, 4, 7, 8, 15, 7, 8, 9, 10

    • 10

    • 9

    • 7

    • 3

    Correct Answer
    A. 9
    Explanation
    The mean is calculated by adding up all the numbers in the set and then dividing the sum by the total number of values. In this case, the sum of the numbers is 12 + 10 + 4 + 7 + 8 + 15 + 7 + 8 + 9 + 10 = 90. Since there are 10 numbers in the set, the mean is 90/10 = 9.

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  • 5. 

    What weight of sodium chloride is present in a molar solution?

    • 58 g

    • 35 g

    • 1116 g

    • 23 g

    Correct Answer
    A. 58 g
    Explanation
    A molar solution is a solution that contains one mole of a substance in one liter of solution. The molar mass of sodium chloride (NaCl) is 58 g/mol. Therefore, in a molar solution of sodium chloride, the weight of sodium chloride present would be 58 grams.

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  • 6. 

    A lavender specimen collection tube contains which additive?

    • Heparin

    • Fluoride

    • EDTA

    • Citrate

    Correct Answer
    A. EDTA
    Explanation
    The lavender specimen collection tube contains EDTA as an additive. EDTA, or ethylenediaminetetraacetic acid, is commonly used as an anticoagulant in blood collection tubes. It helps prevent blood from clotting by binding to calcium ions, which are necessary for the coagulation process. This allows the blood to remain in a liquid state for further testing and analysis.

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  • 7. 

    A green specimen collection tube contains which additive?

    • Heparin

    • Fluoride

    • EDTA

    • Citrate

    Correct Answer
    A. Heparin
    Explanation
    The correct answer is heparin. Heparin is an anticoagulant commonly used in green specimen collection tubes to prevent blood from clotting. It inhibits the formation of blood clots by blocking the activity of certain clotting factors. This allows the blood to remain in a liquid state, making it suitable for various laboratory tests. Heparin is often used for tests that require plasma, such as blood gas analysis and certain chemistry tests.

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  • 8. 

    If someone spilled concentrated acid on the floor, you would:

    • Wipe it up with a towel

    • Leave it for the janitor

    • Use the spill kit and clean up

    • Ignore it

    Correct Answer
    A. Use the spill kit and clean up
    Explanation
    Using a spill kit and cleaning up is the correct answer because concentrated acid is a hazardous substance that can cause harm to people and damage to the environment. It is important to handle such spills carefully and safely. A spill kit contains the necessary materials and equipment to safely clean up hazardous spills, such as absorbent materials, gloves, goggles, and disposal bags. Ignoring the spill or leaving it for the janitor could lead to accidents or further damage. Wiping it up with a towel may not be sufficient to safely contain and dispose of the acid.

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  • 9. 

    In using a centrifuge:

    • It is always preferable to run at maximum speeds

    • The stoppers should never be left on test tube

    • Test tubes must be balanced

    • Always use the brake to stop the centrifuge

    Correct Answer
    A. Test tubes must be balanced
    Explanation
    In order to ensure accurate and reliable results, test tubes must be balanced when using a centrifuge. Balancing the test tubes helps to distribute the weight evenly, preventing any imbalances that could cause the centrifuge to vibrate or malfunction. This is important because an unbalanced centrifuge can lead to inaccurate separation of samples and potentially damage the equipment. Therefore, it is necessary to properly balance the test tubes before running the centrifuge.

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  • 10. 

    What is gluconeogensis?

    • The breakdown of glycogen to form glucose and other intermediate products

    • The conversion of glucose to glycogen

    • The formation of glucose from non-carbohydrates

    • The conversion of glucose to lactate or pyruvate

    Correct Answer
    A. The formation of glucose from non-carbohydrates
    Explanation
    Gluconeogenesis is the process by which glucose is formed from non-carbohydrate sources, such as amino acids or glycerol. This process occurs primarily in the liver and kidneys and is important for maintaining blood glucose levels during periods of fasting or low carbohydrate intake. By synthesizing glucose from non-carbohydrate sources, the body can ensure a steady supply of glucose to meet its energy needs.

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  • 11. 

    Which hormone is produced in beta cells of the pancreas and acts to lower blood glucose?

    • Insulin

    • Glucagon

    • Epinephrine

    • Thyroxine

    Correct Answer
    A. Insulin
    Explanation
    Insulin is produced in the beta cells of the pancreas and is responsible for lowering blood glucose levels. It does this by facilitating the uptake of glucose from the bloodstream into cells, where it can be used for energy or stored for later use. Insulin also promotes the storage of excess glucose as glycogen in the liver and muscles. Glucagon, on the other hand, is produced in the alpha cells of the pancreas and acts to increase blood glucose levels. Epinephrine and thyroxine are hormones produced by other glands in the body and do not directly affect blood glucose levels.

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  • 12. 

    Gout is a pathologic condition that is characterized by the accumulation of which of the following in joints and other body tissues?

    • Calcium

    • Phosphorus

    • Blood urea nitrogen (BUN)

    • Uric acid

    Correct Answer
    A. Uric acid
    Explanation
    Gout is a condition characterized by the accumulation of uric acid in joints and other body tissues. Uric acid is a waste product that is produced when the body breaks down purines, which are found in certain foods and drinks. In individuals with gout, there is either an overproduction or underexcretion of uric acid, leading to its buildup in the joints. This accumulation can cause inflammation, pain, and swelling, resulting in the symptoms commonly associated with gout. Therefore, the correct answer is uric acid.

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  • 13. 

    1 milliliter equals:

    • 1 microliter

    • 100 microliters

    • 1000 microliters

    • 1000000 microliters

    Correct Answer
    A. 1000 microliters
    Explanation
    One milliliter is equal to 1000 microliters. This is because the prefix "milli-" represents one thousandth, while the prefix "micro-" represents one millionth. Therefore, when converting from milliliters to microliters, we multiply by 1000.

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  • 14. 

    A light blue specimen collection tube contains which additive?

    • Heparin

    • Fluoride

    • EDTA

    • Citrate

    Correct Answer
    A. Citrate
    Explanation
    The correct answer is citrate. A light blue specimen collection tube is typically used for coagulation tests, and it contains citrate as an additive. Citrate is an anticoagulant that prevents blood from clotting by binding to calcium ions, thus allowing accurate testing of coagulation factors. Heparin, fluoride, and EDTA are commonly used additives in other types of collection tubes for different purposes, such as preventing clotting or preserving blood for certain types of tests.

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  • 15. 

    The breakdown of red blood cells is termed:

    • Hematoma

    • Hemolysis

    • Hematemesis

    • Hematuria

    Correct Answer
    A. Hemolysis
    Explanation
    Hemolysis is the correct answer because it refers to the breakdown of red blood cells. Hemolysis can occur due to various factors such as infections, autoimmune disorders, or certain medications. This process leads to the release of hemoglobin from the red blood cells, which can have various effects on the body depending on the extent of hemolysis.

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  • 16. 

    Which class includes enzymes that catalyze cleavage of a variety of bonds by the addition of water?

    • Transferases

    • Hydrolases

    • Oxidoreductases

    Correct Answer
    A. Hydrolases
    Explanation
    Hydrolases are a class of enzymes that catalyze the cleavage of various bonds by adding water. They play a crucial role in breaking down complex molecules into simpler ones through hydrolysis reactions. This process is essential for digestion, as well as for the metabolism of carbohydrates, lipids, and proteins. Hydrolases are responsible for breaking down specific bonds such as ester, peptide, and glycosidic bonds by adding a water molecule, resulting in the formation of two separate molecules. Therefore, hydrolases are the correct class of enzymes for catalyzing bond cleavage by water addition.

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  • 17. 

    The pH range usually accepted as normal in the healthy adult is:

    • 7.30-7.40

    • 7.35-7.45

    • 7.00-7.80

    • 6.80-7.80

    Correct Answer
    A. 7.35-7.45
    Explanation
    The pH range usually accepted as normal in the healthy adult is 7.35-7.45. This range is considered normal because it represents a slightly alkaline state, which is necessary for optimal bodily functions. Any deviation from this range can indicate an imbalance in the body's acid-base balance, which can lead to health issues.

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  • 18. 

    The lungs affect the _______ parameter and are the first compensation for ______ abnormalities.

    • Metabolic, respiratory

    • Respiratory, metabolic

    • Metabolic, metabolic

    • Respiratory, respiratory

    Correct Answer
    A. Respiratory, metabolic
    Explanation
    The lungs affect the respiratory parameter, which refers to the body's ability to exchange oxygen and carbon dioxide. They are the first compensation for metabolic abnormalities, which are related to the body's chemical processes and energy production. This means that when there is a metabolic abnormality, the lungs will adjust their function to try and restore balance in the body.

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  • 19. 

    How much CuSO4 is needed to make up 1 liter of 2.5 M CuSO4?

    • 400000 g

    • 400 g

    • .016 g

    • 64000 g

    Correct Answer
    A. 400 g
    Explanation
    To make up 1 liter of a 2.5 M CuSO4 solution, we need to calculate the mass of CuSO4 required. Molarity (M) is defined as the number of moles of solute per liter of solution. The molar mass of CuSO4 is 159.61 g/mol. Therefore, to find the mass, we can use the formula: Mass = Molarity x Volume x Molar mass. Plugging in the values, we get: Mass = 2.5 mol/L x 1 L x 159.61 g/mol = 399.025 g. Rounding to the nearest gram, the correct answer is 400 g.

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  • 20. 

    Blood specimens are not acceptable for lab testing when which of the following is noted?

    • No patient name or identification number on the label

    • Label on request form and that on tube do not match

    • Wrong collection tube used

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    When blood specimens are being used for lab testing, they are considered unacceptable if any of the following conditions are observed: there is no patient name or identification number on the label, the label on the request form does not match the label on the tube, or the wrong collection tube is used. In all of these cases, the accuracy and reliability of the lab testing may be compromised, making the specimens unacceptable for analysis.

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  • 21. 

    Which of the following should be collected from an adult for a test requiring 4 ml of serum?

    • 4 ml red top tube

    • 10 ml red top tube

    • 4 ml lavender top tube

    • 10 ml lavender top tube

    Correct Answer
    A. 10 ml red top tube
    Explanation
    The correct answer is 10 ml red top tube because the test requires 4 ml of serum, and the red top tube with a capacity of 10 ml would provide enough volume to collect the required amount of serum. The lavender top tube is not suitable for this test as it is typically used for collecting whole blood samples for hematology testing, not serum.

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  • 22. 

    Which of the following is not considered a PPE item?

    • Gloves

    • Lab coats

    • Face shield

    • Fume hood

    Correct Answer
    A. Fume hood
    Explanation
    A fume hood is not considered a PPE item because it is not worn or used to protect the individual directly. A fume hood is a piece of equipment used in laboratories to control exposure to hazardous fumes, vapors, or dust. It is a ventilated enclosure that helps to safely contain and remove these harmful substances from the working area. While gloves, lab coats, and face shields are all examples of personal protective equipment that are worn by individuals to protect themselves from various hazards, a fume hood is not worn and does not provide direct protection to the individual.

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  • 23. 

    Which of the following best provides important safety information to a technician about a chemical being used in the laboratory?

    • Material safety data sheet

    • Procedure manual

    • Occupational hazard sheet

    • Chemical package insert

    Correct Answer
    A. Material safety data sheet
    Explanation
    A material safety data sheet (MSDS) is a document that provides important safety information about a chemical being used in the laboratory. It includes details about the chemical's properties, hazards, handling precautions, emergency procedures, and disposal methods. MSDSs are essential for technicians to understand the potential risks associated with the chemical and to take appropriate safety measures to prevent accidents or injuries. Therefore, an MSDS is the best source of safety information for a technician working with a chemical in the laboratory.

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  • 24. 

    Reference intervals typically represent what range of values in a group of results fromhealthy individuals?

    • The mean + or - 1SD

    • The mean + or - 2SD

    • The mean + or - 3SD

    • The mean + or - 4SD

    Correct Answer
    A. The mean + or - 2SD
    Explanation
    Reference intervals typically represent the range of values that are considered normal or healthy for a specific test or measurement. In this case, the correct answer is "the mean + or - 2SD", which means that the reference interval includes values that are within two standard deviations above and below the mean. This range is commonly used to define what is considered normal for a particular test or measurement in a group of healthy individuals.

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  • 25. 

    The substances which will act as catalysts for the chemical reactions in the body are called:

    • Buffers

    • Enzymes

    • Hormones

    • None of these

    Correct Answer
    A. Enzymes
    Explanation
    Enzymes are substances that act as catalysts for chemical reactions in the body. They speed up the rate of these reactions without being consumed or permanently altered in the process. Enzymes play a crucial role in various biological processes, such as digestion, metabolism, and cell signaling. They are highly specific and typically work by binding to specific molecules, known as substrates, and converting them into different products. Unlike buffers and hormones, enzymes specifically facilitate chemical reactions and are essential for the functioning of living organisms.

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  • 26. 

    What information is included on NFPA labels?

    • Flammability hazards

    • Reactivity hazards

    • Health hazards

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    NFPA labels include information about flammability hazards, reactivity hazards, and health hazards. These labels are used to communicate the potential dangers and risks associated with a particular substance or product. By including all of this information on the labels, individuals can make informed decisions about how to handle and use these materials safely.

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  • 27. 

    What is glycogenolysis?

    • The breakdown of glycogen to form glucose and other intermediate products

    • The conversion of glucose to glycogen

    • The formation of glucose from non-carbohydrates

    • The conversion of glucose to lactate or pyrubate

    Correct Answer
    A. The breakdown of glycogen to form glucose and other intermediate products
    Explanation
    Glycogenolysis refers to the breakdown of glycogen, which is a stored form of glucose in the body, into glucose and other intermediate products. This process occurs when the body needs to release glucose into the bloodstream for energy. By breaking down glycogen, glucose can be readily available for use by cells. The other intermediate products generated during glycogenolysis can also be used as energy sources or converted into glucose through other metabolic pathways.

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  • 28. 

    Which hormone is produced in the alpha cells of the pancreas and acts to raise blood glucose?

    • Insulin

    • Glucagon

    • Epinephrine

    • Thyroxine

    Correct Answer
    A. Glucagon
    Explanation
    Glucagon is produced in the alpha cells of the pancreas and acts to raise blood glucose levels. It does this by stimulating the liver to break down glycogen into glucose, which is then released into the bloodstream. This hormone is released when blood sugar levels are low, signaling the body to increase glucose production and maintain proper blood sugar levels. Insulin, on the other hand, is produced in the beta cells of the pancreas and acts to lower blood glucose levels by facilitating the uptake of glucose by cells.

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  • 29. 

    If the total bilirubin is 4.3 mg/dl and the conjugated bilirubin is 2.1 mg/dl, the unconjugated bilirubin in mg/dl is:

    • 1.1

    • 2.2

    • 4.2

    • 6.3

    Correct Answer
    A. 2.2
    Explanation
    The unconjugated bilirubin can be calculated by subtracting the conjugated bilirubin from the total bilirubin. In this case, the total bilirubin is 4.3 mg/dl and the conjugated bilirubin is 2.1 mg/dl. Therefore, the unconjugated bilirubin is 4.3 - 2.1 = 2.2 mg/dl.

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  • 30. 

    The major site of cholesterol esterification is:

    • Intestinal mucosa

    • Liver

    • Heart

    • Vascular walls

    Correct Answer
    A. Liver
    Explanation
    The liver is the major site of cholesterol esterification. This is because the liver plays a crucial role in lipid metabolism, including the synthesis and breakdown of cholesterol. Cholesterol esterification involves the conversion of cholesterol into cholesterol esters, which are more stable and can be stored in cells or transported in the bloodstream. The liver has high levels of the enzyme acyl-CoA:cholesterol acyltransferase (ACAT), which catalyzes this esterification process. Additionally, the liver is responsible for regulating cholesterol levels in the body, producing bile acids, and synthesizing lipoproteins.

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  • 31. 

    What is the name used to describe the liquid part of the blood containing the clotting factor fibrinogen?

    • Plasma

    • Red blood cells

    • Buffy coat

    • Serum

    Correct Answer
    A. Plasma
    Explanation
    Plasma is the correct answer because it is the name used to describe the liquid part of the blood that contains the clotting factor fibrinogen. Plasma makes up about 55% of the total blood volume and is responsible for transporting nutrients, hormones, and waste products throughout the body. It also plays a crucial role in blood clotting, as fibrinogen is essential for the formation of blood clots.

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  • 32. 

    What is the final dilution of a 0.2 ml of patient sample mixed with 4.8 ml of water?

    • 1:5

    • 1:25

    • 1:50

    • 1:100

    Correct Answer
    A. 1:25
    Explanation
    The final dilution of the patient sample mixed with water is 1:25. This means that the original volume of the patient sample (0.2 ml) has been diluted 25 times by adding 4.8 ml of water. The dilution ratio is calculated by dividing the total volume of the diluted solution (5 ml) by the original volume of the patient sample (0.2 ml), resulting in a dilution ratio of 1:25.

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  • 33. 

    Perform the conversion of 50 ml to L:

    • 0.005

    • 0.05

    • 0.5

    • 5

    Correct Answer
    A. 0.05
    Explanation
    To convert milliliters (ml) to liters (L), you divide the value in milliliters by 1000. In this case, 50 ml divided by 1000 equals 0.05 L. Therefore, the correct answer is 0.05.

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  • 34. 

    Which of the following is an alternation to the ratio of dissolved chemicals and plasma at a blood collection site as a result of prolonged tourniquet application?

    • Hematoma

    • Hemoconcentration

    • Petechiae

    • Dilution

    Correct Answer
    A. Hemoconcentration
    Explanation
    Prolonged tourniquet application during blood collection can lead to hemoconcentration, which is an alteration in the ratio of dissolved chemicals and plasma. This occurs because the tourniquet restricts blood flow, causing an increase in the concentration of blood cells and dissolved substances in the collected sample. Hemoconcentration can affect the accuracy of laboratory test results, as it can lead to falsely elevated levels of certain substances in the blood.

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  • 35. 

    Given the following set of data, calculate the mean, SD and CV. Report each to the tenth's position. 101, 103, 105, 99, 108, 101, 100, 98, 102

    • Mean=104.1, SD=3.3, CV=3.0

    • Mean=101.9, SD=3.1, CV=3.0

    • Mean=99.8, SD=2.8, CV=2.8

    • Mean=95.5, SD=2.5, CV=2.8

    Correct Answer
    A. Mean=101.9, SD=3.1, CV=3.0
    Explanation
    The given set of data consists of 9 numbers. To calculate the mean, we sum up all the numbers and divide by the total count, which gives us a mean of 101.9. To calculate the standard deviation (SD), we find the difference between each number and the mean, square those differences, sum them up, divide by the count, and take the square root of the result. This gives us an SD of 3.1. The coefficient of variation (CV) is calculated by dividing the SD by the mean and multiplying by 100, giving us a CV of 3.0.

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  • 36. 

    The National Bureau of Standards determines specifications for calibrations of:

    • Volumetric glassware

    • Beakers

    • Graduated cylinders

    • Colorimeters

    Correct Answer
    A. Volumetric glassware
    Explanation
    The National Bureau of Standards determines specifications for calibrations of volumetric glassware because volumetric glassware is used to accurately measure and dispense specific volumes of liquid. Calibrating the glassware ensures that it is accurate and reliable, which is crucial in various scientific and laboratory applications where precise measurements are required.

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  • 37. 

    The majority of proteins are manufactured in the

    • Liver

    • Reticuloendothlial system

    • Plasma cells

    • Kidneys

    Correct Answer
    A. Liver
    Explanation
    The liver is responsible for the production of the majority of proteins in the body. It is a vital organ involved in various metabolic processes, including protein synthesis. The liver contains specialized cells called hepatocytes, which are responsible for producing and releasing proteins into the bloodstream. These proteins play crucial roles in maintaining the body's overall health and function. Therefore, it is logical to conclude that the liver is the correct answer for this question.

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  • 38. 

    The transport protein for iron is:

    • Transcortin

    • Ceruloplasmin

    • Transferrin

    • Ferritin

    Correct Answer
    A. Transferrin
    Explanation
    Transferrin is the correct answer because it is a transport protein responsible for carrying iron in the blood. It binds to iron ions and transports them to cells throughout the body. Transcortin is a protein that binds to cortisol, not iron. Ceruloplasmin is a protein that carries copper, not iron. Ferritin is a protein that stores iron within cells, but it is not involved in the transport of iron in the blood. Therefore, the correct answer is transferrin.

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  • 39. 

    In a chemical reaction, loss of electrons is:

    • Oxidation

    • Reduction

    Correct Answer
    A. Oxidation
    Explanation
    In a chemical reaction, the loss of electrons is referred to as oxidation. Oxidation involves the transfer of electrons from one atom or molecule to another, resulting in an increase in the oxidation state or positive charge of the atom or molecule that loses the electrons. This process is often associated with the addition of oxygen or the removal of hydrogen from a substance.

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  • 40. 

    Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) are both elevated in which of the following disease?

    • Muscular dystrophy

    • Viral hepatitis

    • Pulmonary emboli

    • Myocardial infarction

    Correct Answer
    A. Viral hepatitis
    Explanation
    AST and ALT are enzymes found in the liver. In viral hepatitis, the liver is inflamed and damaged, causing the release of these enzymes into the bloodstream. Therefore, both AST and ALT levels are elevated in viral hepatitis. Muscular dystrophy, pulmonary emboli, and myocardial infarction do not directly affect the liver, so AST and ALT levels would not be elevated in these conditions.

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  • 41. 

    Which is the major extracellular anion?

    • Sodium

    • Potassium

    • Chloride

    • Magnesium

    Correct Answer
    A. Chloride
    Explanation
    Chloride is the major extracellular anion because it is found in higher concentrations outside the cells compared to other anions such as sodium, potassium, and magnesium. It plays a crucial role in maintaining fluid balance, regulating osmotic pressure, and assisting in the transport of other ions across cell membranes. Chloride also helps in the formation of hydrochloric acid in the stomach, which aids in digestion. Therefore, chloride is the correct answer as it is the primary extracellular anion in the body.

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  • 42. 

    A potassium level of 6.8 mmol/L is obtained. Before reporting the results, the first step the laboratory technician should take is to:

    • Check the serum for hemolysis

    • Check the age of the patient

    • Call the physician

    • Repeat the test

    Correct Answer
    A. Check the serum for hemolysis
    Explanation
    The laboratory technician should check the serum for hemolysis before reporting the results because hemolysis can cause a falsely elevated potassium level. Hemolysis refers to the breakdown of red blood cells, which can release potassium into the serum and artificially increase the potassium level. By checking for hemolysis, the technician can ensure that the potassium level is accurate and not influenced by any external factors.

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  • 43. 

    A 1x10 to the -6th solution of HCl has pH of:

    • 4

    • 6

    • 8

    • 3.3

    Correct Answer
    A. 6
    Explanation
    A solution with a pH of 6 indicates that it is slightly acidic. The lower the pH value, the more acidic the solution. Since HCl is a strong acid, a 1x10 to the -6th solution of HCl will have a relatively low pH. A pH of 6 suggests that the concentration of H+ ions in the solution is relatively low, but still acidic in nature.

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  • 44. 

    20 ul is equivalent to:

    • 2 ml

    • 0.02 ml

    • 20000 ml

    Correct Answer
    A. 0.02 ml
    Explanation
    20 ul is equivalent to 0.02 ml because 1 ml is equal to 1000 ul. Therefore, to convert 20 ul to ml, we divide 20 by 1000, which gives us 0.02 ml.

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  • 45. 

    1 gram equals

    • 1 million micrograms

    • 1000 milligrams

    • 0.001 kilograms

    • All of these

    Correct Answer
    A. All of these
    Explanation
    The statement "all of these" implies that all the given options are correct. 1 gram is equal to 1 million micrograms, 1000 milligrams, and 0.001 kilograms. Therefore, all the options mentioned are valid conversions for 1 gram.

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  • 46. 

    When pipetting concentrated acid or alkali, it should always be done:

    • In the sink

    • Away from others

    • Under the hood

    • At your own risk

    Correct Answer
    A. Under the hood
    Explanation
    When pipetting concentrated acid or alkali, it should always be done under the hood. This is because concentrated acids and alkalis can release harmful fumes that can be dangerous to inhale. Working under the hood helps to contain these fumes and provides a safer working environment. Additionally, it helps to prevent any accidental spills or splashes from coming into contact with the skin or eyes, reducing the risk of injury. Therefore, working under the hood is the most appropriate and safe method for pipetting concentrated acid or alkali.

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  • 47. 

    Which of the following is considered a pre-analytical variable?

    • QC data

    • Results reporting

    • Test processing

    • Sample transport

    Correct Answer
    A. Sample transport
    Explanation
    Sample transport is considered a pre-analytical variable because it refers to the process of transporting samples from the collection site to the laboratory for analysis. This step is crucial as it can impact the integrity and quality of the sample, potentially leading to inaccurate test results. Factors such as temperature, handling, and transportation time can all affect the stability and reliability of the sample, making sample transport an important pre-analytical variable to consider in laboratory testing.

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  • 48. 

    A physician suspects his patient has pancreatitis. Which test would be most indicative of this disease?

    • Creatinine

    • LD isoenzymes

    • Beta-hydrozybutyrate

    • Amylase

    Correct Answer
    A. Amylase
    Explanation
    Amylase is an enzyme produced by the pancreas that helps in the digestion of carbohydrates. Elevated levels of amylase in the blood can indicate pancreatitis, which is inflammation of the pancreas. Therefore, the presence of amylase in the given options suggests that it is the most indicative test for diagnosing pancreatitis. Creatinine is a waste product that indicates kidney function, LD isoenzymes are used to diagnose heart attacks, and beta-hydroxybutyrate is a marker for diabetic ketoacidosis, none of which are directly related to pancreatitis.

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  • 49. 

    The presence of increased CK-MB activity on a CK electrophoresis pattern is most likely found in a patient suffering from:

    • Acute muscular stress following strenuous exercise

    • Malignant liver disease

    • Myocardial infarction

    • Severe head injury

    Correct Answer
    A. Myocardial infarction
    Explanation
    The presence of increased CK-MB activity on a CK electrophoresis pattern suggests myocardial infarction. CK-MB is a specific isoenzyme of creatine kinase that is predominantly found in the heart muscle. Elevated levels of CK-MB indicate damage to the heart muscle, which is commonly seen in patients with myocardial infarction. Acute muscular stress following strenuous exercise may also cause an increase in CK-MB activity, but it is less likely compared to myocardial infarction. Malignant liver disease and severe head injury are not associated with increased CK-MB activity.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
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  • May 05, 2013
    Quiz Created by
    Amandaregal

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