6651 to 6700 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 6651 to 6700
- A non-functional plasma enzyme is
- Psudocholinesterase
- Lipoprotein lipase
- Proenzyme of blood coagulation
- Lipase ✔
- The pH optima for salivary analyse is
- 6.6–6.8 ✔
- 2.0–7.5
- 7.9
- 8.6
- The pH optima for sucrase is
- 5.0–7.0 ✔
- 5.8–6.2
- 5.4–6.0
- 8.6
- The pH optima for maltase is
- 1.0–2.0
- 5.2–6.0
- 5.8–6.2 ✔
- 5.4–6.0
- The pH optima for lactase is
- 1.0-2.0
- 5.4–6.0
- 5.0–7.0 ✔
- 5.8–6.2
- The substrate for amylase is
- Cane sugar
- Starch ✔
- Lactose
- Ribose
- The ion which activates salivary amylase activity is
- Chloride ✔
- Bicarbonate
- Sodium
- Potassium
- The pancreatic amylase activity is increased in the presence of
- Hydrochloric acid
- Bile salts
- Thiocyanate ions
- Calcium ions ✔
- A carbohydrate which can not be digested in human gut is
- Cellulose ✔
- Starch
- Glycogen
- Maltose
- The sugar absorbed by faciLitated diffusion and requiring Na independent transporter is
- Glucose
- Fructose ✔
- Galactose
- Ribose
- In the intestine the rate of absorption is highest for
- Glucose and galactose ✔
- Fructose and mannose
- Fructose and pentose
- Mannose and pentose
- Glucose absorption is promoted by
- Vitamin A
- Thiamin✔
- Vitamin C
- Vitamin K
- At low blood glucose concentration, brain but not liver will take up glucose. It is due to the
- Low Km of hexokinase ✔
- Low Km of glucokinase
- Specificity of glucokinase
- Blood brain barrier
- In the reaction below, Nu TP stands for NuTP + glucose → Glucose 6–Phosphate + NuDP.
- ATP
- CTP
- GTP
- UTP ✔
- The enzyme of the glycolic pathway, sensitive to inhibiton by fluoride ions is
- Hexokinase
- Aldolase
- Enolase ✔
- Pyruvate kinase
- In glycolytic pathway, iodacetate inhibits the activity of the enzyme:
- Phosphotriose isomerase
- Glyceraldehyde-3-phosphate dehydrogenase ✔
- Pyruvate kinase
- Phosphofructokinase
- In the glycolytic pathway, enolpyruvate is converted to ketopyruvate by
- Pyruvate kinase
- Phosphoenolpyruvate
- Pyruvate dehydrogenase
- Spontaneously ✔
- In erythrocytes, 2, 3-biphosphoglycerate is derived from the intermediate:
- Glyeraldehyde-3-phosphate
- 1, 3-Biphosphoglycerate ✔
- 3-Phosphoglycerate
- 2-Phosphoglycerate
- 2, 3-Biphosphoglycerate in high concentrations, combines with hemoglobin, causes
- Displacement of the oxyhemoglobin dissociation curve to the left
- Displacement of the oxyhemoglobin dissociation curve to the right ✔
- No change in oxy hemoglobin dissociation curve
- Increased affinity for oxygen
- Erythrocytes under normal conditions and microorganisms under anaerobic conditions may accumulate
- NADPH
- Pyruvate
- Phosphoenolpyruvate
- Lactate ✔
- Lineweaver – Burk double reciprocal plot is related to
- Substrate concentration
- Enzyme activity
- Temperature
- Both (Substrate concentration) and (Enzyme activity)✔
- Phosphofructokinase key enzyme in glycolysis is inhibited by
- Citrate and ATP✔
- AMP
- ADP
- TMP
- One of the enzymes regulating glycolysis is
- Phosphofructokinase ✔
- Glyceraldehyde-3-phosphate dehydrogenase
- Phosphotriose isomerase
- Phosphohexose isomerase
- Hexokinase is inhibited in an allosteric manner by
- Glucose-6-Phosphate ✔
- Glucose-1-Phosphate
- Fructose-6-phosphate
- Fructose-1, 6-biphosphate
- A reaction which may be considered an isomerisation is
- Glucose 6-Phosphate fructose 6 phosphate ✔
- 3-Phosphoglycerate 2-phosphoglycerate
- 2-phosphoglycerate phosphoenolpyruvate
- Pyruvate Lactate
- The net number of ATP formed per mole of glucose in anaerobic glycolysis is
- 1
- 2 ✔
- 6
- 8
- Pyruvate dehydrogenase a multienzyme complex is required for the production of
- Acetyl-CoA ✔
- Lactate
- Phosphoenolpyruvate
- Enolpyruvate
- Dietary deficiency of thiamin inhibits the activity of the enzyme:
- Pyruvate kinase
- Pyruvate dehydrogenase ✔
- Phosphofructokinase
- Enolase
- Pyruvate dehydrogenase activity is inhibited by
- Mercury ✔
- Zinc
- Calcium
- Sodium
- All the enzymes of glycolysis pathway are found in
- Extramitochondrial soluble fraction of the cell ✔
- Mitochondria
- Nucleus
- Endoplasmic reticulum
- Most major metabolic pathways are considered mainly either anabolic or catabolic. Which of the following pathway is most correctly considered to be amphibolic?
- Citric acid cycle ✔
- Gluconeogenesis
- Lipolysis
- Glycolysis
- The enzymes of the citric acid cycle are located in
- Mitochondrial matrix ✔
- Extramitochondrial soluble fraction of the cell
- Nucleus
- Endoplasmic reticulum
- The initial step of the citric acid cycle is
- Conversion of pyruvate to acetyl-CoA ✔
- Condensation of acetyl-CoA with oxaloacetate
- Conversion of citrate to isocitrate
- Formation of α -ketoglutarate catalysed by isocitrate dehydrogenase
- The substance which may be considered to play a catalytic role in citric acid cycle is
- Oxaloacetate ✔
- Isocitrate
- Malate
- Fumarate
- An enzyme of the citric acid cycle also found outside the mitochondria is
- Isocitrate dehydrogenase
- Citrate synthetase
- α-Ketoglutarate dehydrogenase
- Malate dehydrogenase ✔
- The reaction catalysed by α-ketoglutarate dehydrogenase in the citric acid cycle requires
- NAD ✔
- NADP
- ADP
- ATP
- If all the enzymes, intermediates and cofactors of the citric acid cycle as well as an excess of the starting substrate acetylCoA are present and functional in an organelle free solution at the appropriate pH, which of the following factors of the citric acid cycle would prove to be rate limiting?
- Molecular oxygen
- Half life of enzyme
- Turnover of intermediates
- Reduction of cofactors ✔
- In TCA cycle, oxalosuccinate is converted to α-ketoglutarate by the enzyme:
- Fumarase
- Isocitrate dehydrogenase ✔
- Aconitase
- Succinase
- The enzyme -ketoglutarate dehydrogenase in the citric acid cycle requires
- Lipoate ✔
- Folate
- Pyridoxine
- Inositol
- The example of generation of a high energy phosphate at the substrate level in the citric acid cycle is the reaction:
- Isocitrate α-Ketoglutarate
- Succinate α-fumarate
- Malate α-oxaloacetate
- Succinyl CoA α-Succinate ✔
- Fluoroacetate inhibits the reaction of citric acid cycle:
- Isocitrate α-Ketoglutarate
- Fumarate α-Malate
- Citrate α-cis-aconitate ✔
- Succinate α-fumarate
- Formation of succinyl-CoA from α-Ketoglutarate is inhibited by
- Fluoroacetate
- Arsenite ✔
- Fluoride
- Iodoacetate
- The number of ATP molecules generated for each turn of the citric acid cycle is
- 8
- 12 ✔
- 24
- 38
- Oxidation of one molecule of glucose yields
- 12 ATP
- 24 ATP
- 38 ATP
- 38 ATP ✔
- Which of the following intermediates of metabolism can be both a precursor and a product of glucose?
- Lactate
- Pyruvate ✔
- Alanine
- Acetyl-CoA
- Mitochondrial membrane is freely preamble to
- Pyruvate
- Malate ✔
- Oxaloacetate
- Fumarate
- The reaction of Kreb’s cycle which does not require cofactor of vitamin B group is
- Citrate isocitrate
- α -Ketoglutarate succinate
- Malate oxaloacetate
- Succinate fumarate ✔
- The coenzyme not involved in the formation of acetyl-CoA from pyruvate is
- TPP
- Biotin ✔
- NAD
- FAD
- A carrier molecule in the citric acid cycle is
- Acetyl-CoA ✔
- Citrate
- Oxaloacetate
- Malate
- A specific inhibitor for succinate dehydrogenase is
- Arsenine
- Arsenite ✔
- Citrate
- Fluoride
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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