7201 to 7250 MCQs for Lab Technician and Technologist Exam Preparation
5000 Plus MCQs for Lab Technician and Technologists are designed to test the knowledge and proficiency of laboratory professionals who work in the field of clinical laboratory science. These questions cover a wide range of topics related to laboratory science, including anatomy, physiology, microbiology, chemistry, and hematology.
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Questions 7201 to 7250
- A characteristic of pheochromocytoma is elevated urinary excretion of
- Dopamine
- Tyrosine
- Vinylmandelic acid✔
- Phenylalanine
- In the synthetic pathway of epinephrine, disulfiram (antabuse) inhibits the enzyme:
- Tyrosine hydroxylase
- Dopamine β-hydroxylase ✔
- DOPA decarboxylase
- N-methyl transferase
- The biosynthesis of both Catecholamine and serotonin require
- Tyrosine hydroxylase
- N-methyl transferase
- Aromatic amino acid decarboxylase ✔
- Tryptophan pyrrolase
- Epinephrine stimulates glycogenolysis in
- Liver
- Muscle
- Liver and muscle ✔
- Kidney
- A cup of strong coffee would be expected to
- Interfere with the synthesis of prostaglandins
- Decrease the effect of glucagon
- Enhance the effect of epinephrine ✔
- Provide the vitamin nicotinic acid
- Epinephrine is derived from norepinephrine by
- Decarboxylation
- Hydroxylation
- Oxidation
- N-methylation ✔
- 5 HIAA test is negative if patient is taking
- Aspirin
- Colchicine
- Phenothiazone ✔
- Methotrexate
- Presence of significant amount of 5-HIAA in urine indicates
- Carcinoid in liver
- Carcinoid in appendix ✔
- Metastasis of carcinoma of liver
- Hepatoma
- The normal serum level of triiodothyronine (T3) is
- 0.2–0.5 ng/ml
- 0.7–2.0 ng/ml ✔
- 2.0–4.0 ng/ml
- 5.0–8.0 ng/ml
- The normal serum level of thyroxine (T4) is
- 2.0–4.0 µg/100 ml
- 5.5–13.5 µg/100 ml✔
- 14.0–20.3 µg/100 ml
- 20.0–25.0 µg/100 ml
- Excess secretion of thyroid hormones causes
- Hyperthyroidism ✔
- Myxoedema
- Cretinism
- Cushing syndrome
- Insufficient free T3 and T4 results in
- Grave’s disease
- Mysoedema ✔
- Cushing syndrome
- Gigantism
- When iodine supplies are sufficient the T3 and T4 ratio in thyroglobulin is
- 1 : 2
- 1 : 4
- 1 : 7 ✔
- 1 : 10
- A substance which competes with iodide uptake mechanism by thyroid gland is
- Thiocynate ✔
- Iodoacetate
- Fluoride
- Fluoroacetate
- Thyroperoxidase enzyme contains
- Heme ✔
- Copper
- Zinc
- Magnesium
- Thyroproxidase requires hydrogen peroxide as oxidizing agent. The H2O2 is produced by
- FADH2 dependent enzyme
- NADH dependent enzyme
- NADP dependent enzyme
- NADPH dependent enzyme ✔
- Thyroid stimulating hormone is a dimer. The α-subunits of TSH, LH, FSH are identical. Thus the biological specificity must therefore be β subunit in which the number of amino acids is
- 78
- 112 ✔
- 130
- 199
- TSH stimulates the synthesis delete
- Thyroxine ✔
- Adrenocorticoids
- Epinephrine
- Insulin
- Thyroid hormones are synthesized by the iodination of the amino acid:
- Glycine
- Phenylalanine
- Alanine
- Tyrosine ✔
- The tyrosine residues per molecule of thyroglobulin is
- 85
- 95
- 115✔
- 135
- The percentage of inactive precursors (monoidotyrosine and diiodotyrosine) in thyroglobulin is
- 30
- 40
- 50
- 70 ✔
- The number of amino acids in parathormone is
- 65
- 84 ✔
- 115
- 122
- The sequence of amino acid in which the biological value of parathormone is
- 1–15
- 1–34 ✔
- 30–50
- 50–84
- PTH
- Reduces the renal clearance or excretion of calcium ✔
- Increases renal phosphate clearance
- Increases the renal clearance of calcium
- Decreases the renal phosphate clearance
- The number of amino acids in the peptide hormone calcitonin is
- 16
- 24
- 32 ✔
- 40
- Calcitonin causes
- Calcinuria and phosphaturia ✔
- Decrease in urinary calcium
- Decrease in urinary phosphorous
- Increase in blood calcium level
- The characteristic of hyperparathyroidism is
- Low serum calcium
- High serum phosphorous
- Low serum calcium and high serum phosphorous
- High serum calcium and low serum phosphate ✔
- Parathyroid hormone
- Is released when serum Ca++ is too high
- Inactivates vitamin D
- Is secreted when Ca++ is too low ✔
- Depends on vitamin K for adequate activity
- δ-Cells of islet of langerhans of pancreas produce
- Pancreatic polypeptide
- Pancreatic lipase
- Somatostatin ✔
- Steapsin
- β-cells of islet of langerhans of the pancreas secrete
- Insulin ✔
- Glucagon
- Somatostatin
- Pancreatic polypeptide
- Target tissue of insulin is
- Red blood cells
- Renal tubular cells
- GI tract epithelial cells
- Liver✔
- Insulin is a dimmer. The number of amino acids in the A and B chain respectively is
- 19 and 28
- 21 and 30 ✔
- 25 and 35
- 29 and 38
- In A chain of the insulin molecule the Nterminal amino acid is
- Glycine ✔
- Valine
- Serine
- Phenylalanine
- In the B chain of insulin molecule, the Nterminal amino acid is
- Proline
- Threonine
- Phenylalanine ✔
- Lysine
- In the B chain of insulin molecule, the C-terminal amino acid:
- Threonine ✔
- Tyrosine
- Glutamate
- Valine
- In the insulin molecule, the number of interchain disulphide brides is
- 1
- 2 ✔
- 3
- 4
- Insulin exists in polymeric forms, for polymerization it requires
- Calcium
- Magnesium
- Manganese
- Zinc ✔
- Proinsulin has
- 74 amino acids
- 86 amino acids ✔
- 105 amino acids
- 109 amino acids
- Daily secretion of insulin in a normal adult man is about
- 10 units
- 20 units
- 30 units ✔
- 50 units
- The half life of insulin is
- < 3–5 minutes ✔
- < 8–10 minutes
- < 15 minutes
- < 15 minutes
- Insulin stimulates
- Hepatic glycogenolysis
- Hepatic glycogenesis ✔
- Lipolysis
- Gluconeogenesis
- Action of insulin on lipid metabolism is
- It increases lipolysis and increases triglyceride synthesis
- It decreases lipolysis and increases triglyceride synthesis✔
- It decreases lipolysis and decreases triglyceride synthesis
- It increases synthesis of triglyceride and increased ketogenesis
- Insulin increases the activity of
- Pyruvate kinase ✔
- Phosphorylase
- Triacylglycerol kinase
- Fructose 2, 6-bisphosphatase
- Insulin decreases the activity of
- cAMP dependent protein kinase ✔
- HMG CoA-reductas
- Phosphodiesterase
- Acetyl CoA-carboxylase
- The human insulin gene located on the short arm of chromosome:
- 11 ✔
- 17
- 18
- 20
- Normal serum insulin level varies between
- 4–25 µU/ml ✔
- 25–50 µU/ml
- 70–90 µU/ml
- 100–120 µU /ml
- Following is a normal overnight fast and a cup of black coffee, a diabetic woman feels slightly nausious and decides to skip breakfast. However she does take her shot of insulin. This may result in
- Heightened glycogenolysis
- Hypoglycemia ✔
- Increased lipolysis
- Glycosuria
- Deficiency of insulin results in
- Rapid uptake of sugar
- Low blood glucose level
- Decrease urine output
- Presence of glucose in urine ✔
- The primary stimulus for insulin secretion is increased.
- Blood level of epinephrine
- Blood level of glucagon
- Blood level of glucose ✔
- Water intake
- The α-cells of pancreas islets produce
- Insulin
- Glucagon ✔
- Somatostatin
- Pancreatic polypeptide
The questions are typically designed to assess the technical skills and knowledge required for the laboratory profession, including the ability to analyze laboratory test results, perform laboratory procedures, and maintain laboratory equipment.
To prepare for these MCQs, candidates should have a thorough understanding of the key concepts and principles of laboratory science. They should also be familiar with common laboratory equipment and procedures, as well as laboratory safety protocols.
Candidates may also benefit from studying specific laboratory science textbooks or taking online courses that cover the material tested in the MCQs. Additionally, practicing sample MCQs and reviewing the answers can help candidates identify areas where they may need to improve their knowledge or skills.
Overall, the MCQs for lab technologists are designed to be challenging and comprehensive, requiring candidates to demonstrate a high level of proficiency in the field of laboratory science.
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