6901 to 6950 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 6901 to 6950
- Kinetics of an allosteric enzyme are explained by
- Michaelis-Menten equation
- Lineweaver-Burk plot
- Hill plot ✔
- All of these
- Covalent modification of an enzyme usually involves phosphorylation/ dephosphorylation of
- Serine residue ✔
- Proline residue
- Hydroxylysine residue
- Hydroxyproline residue
- Vmax of an enzyme may be affected by
- pH
- Temperature
- Non-competitive inhibitors
- All of these ✔
- In enzyme assays, all the following are kept constant except
- Substrate concentration ✔
- Enzyme concentration
- pH
- Temperature
- If the substrate concentration is much below the km of the enzyme, the velocity of the reaction is
- Directly proportional to substrate concentration ✔
- Not affected by enzyme concentration
- Nearly equal to Vmax
- Inversely proportional to substrate concentration
- Enzymes requiring NAD as co-substrate can be assayed by measuring change in absorbance at
- 210 nm
- 290 nm
- 340 nm ✔
- 365 nm
- Different isoenzymes of an enzyme have the same
- Amino acid sequence
- Michaelis constant
- Catalytic activity ✔
- All of these
- A high-energy phosphate among the following is
- Glucose-6-phosphate
- Glucose-1-phosphate
- 1, 3-Biphoglycerate ✔
- All of these
- The highest energy level is present amongst the following in
- 1, 3-Biphosphoglycerate
- Creatine phosphate
- Carbamoyl phosphate
- Phosphoenol pyruvate ✔
- Daily urinary urobilinogen excretion in adult men is
- 0–4 mg ✔
- 5–8 mg
- 9–12 mg
- 13–20 mg
- In obstructive jaundice, faecal urobilinogen is
- Absent ✔
- Decreased
- Increased
- Normal
- Acetyl-CoA can be formed from
- Pyruvate
- Fatty acids
- ketone bodies
- All of these✔
- Pyruvate is converted into acetyl-CoA by
- Decarboxylation
- Dehydrogenation
- Oxidative decarboxylation ✔
- Oxidative deamination
- Conversion of pyruvate into acetyl CoA is catalysed by
- Pyruvate dehydrogenase
- Didrolipoyl acetyl transferase
- Dihydrolipoyl dehydrogenase
- All the 3 acting in concert ✔
- Pyruvate dehydrogenase complex is located in
- Cytosol
- Lysosomes
- Mitochondria ✔
- Endoplasmic reticulum
- A flavoprotein in pyruvate dehydrogenase complex is
- Pyruvate dehydrogenase
- Didrolipoyl acetyl transferase
- Dihydrolipoyl dehydrogenase ✔
- None of these
- Pyruvate dehydrogenase complex is regulated by
- Covalent modification
- Allosteric regulation
- Both (Covalent modification) and (Allosteric regulation) ✔
- None of these
- Ribozymes:
- RNA enzyme
- Non-protein enzymes
- Catalyst function
- All of these ✔
- In citric acid cycle, NAD is reduced in
- One reactions
- Two reactions
- Three reactions ✔
- Four reactions
- Among citric acid cycle enzymes, a flavoprotein is
- Malate
- Fumarase
- Succinate dehrogenase ✔
- Isocitrate dehrogenase
- In citric acid cycle, GDP is phosphorylated by
- Succinate dehydrogenase
- Aconitase
- Succinate thiokinase ✔
- Fumarse
- Malonate is an inhibitor of
- Malate dehydrogenase
- α-Ketoglutarate dehydrogenase
- Succinate dehydrogenase ✔
- Isocitrate dehydrogenase
- Isocitrate dehydrogenase is allosterically inhibited by
- Oxalosuccinate
- α-Ketoglutarate
- ATP
- NADH ✔
- All of the following are allosteric enzymes except
- Citrate synthetase
- a-Ketoglutarate dehdrogenase
- Succinate thiokinase ✔
- Succinate dehydrogenase
- All of the following intermediates of citric acid cycle can be formed from amino acids except
- α-Ketoglutarate
- Fumarate
- Malate ✔
- Oxaloacetate
- Glycolytic pathway is located in
- Mitochondria
- Cytosol✔
- Microsomes
- Nucleus
- End product of aerobic glycolysis is
- Acetyl CoA
- Lactate
- Pyruvate ✔
- CO2 and H2O
- During fasting, glucose is phosphorylated mainly by
- Hexokinase ✔
- Glucokinase
- Both (Hexokinase ) and (Glucokinase)
- None of these
- give me correct answar Glucokinase is found in
- Muscles
- Brain
- Liver ✔
- All of these
- In anaerobic glycolysis, energy yield from each molecule of glucose is
- 2 ATP equivalents ✔
- 8 ATP equivalents
- 30 ATP equivalents
- 38 ATP equivalents
- Which of the following is an allosteric enzyme?
- Phosphohexose isomerase
- Phosphotriose isomerase
- Lactate dehydrogenase
- Phosphofructokinase ✔
- Glycolysis is anaerobic in
- Liver
- Brain
- Kidneys
- Erythrocytes ✔
- Phosphofructokinase is allosterically inhibited by
- Fructose-1, 6-biphosphate
- Lactate
- Pyruvate
- Citrate ✔
- Glucose-6-phosphate is an allosteric inhibitor of
- Glucokinase
- Hexokinase ✔
- Phosphohexose isomerase
- None of these
- ATP is a co-substrate as well as an allosteric inhibitor of
- Phosphofructokinase ✔
- Hexokinase
- Glucokinase
- None of these
- Complete oxidation of one molecule of glucose into CO2 and H2O yields
- 8 ATP equivalents
- 15 ATP equivalents
- 30 ATP equivalents
- 38 ATP equivalents ✔
- A unique by-product of glycolysis in erythrocytes is
- Lactate
- 1, 3-Biphosphoglycerate
- 2, 3-Biphosphoglycerate ✔
- All of these
- Which of the following enzymes incorporates inorganic phosphate into the substrate?
- Phosphoglycerate kinase
- Glyceraldehyde-3-phosphate dehydrogenase ✔
- Pyruvate kinase
- Enolase
- Rapoport-Luebering cycle is located in
- Liver
- Muscles
- Brain
- Erythrocytes ✔
- Glycerol can enter glycolytic pathway via
- Dihydroxyacetone phosphate ✔
- 1, 3-Biphospoglycerate
- 3-Phosphoglycerate
- 2-Phosphoglycerate
- HMP shunt is present in
- Erythrocytes
- Liver
- Testes
- All of these ✔
- Glucose-6-phosphate dehydrogenase is induced by
- 6-Phosphogluconolactone
- Glucose-6-phosphate
- Ribose-5-phosphate
- Insulin ✔
- The decarboxylation reaction in HMP shunt is catalysed by
- Gluconolactone hydrolase
- 6-Phosphogluconate dehydrogenase ✔
- 6-Phosphogluconate decarboxylase
- Transaldolase
- The first pentose formed in HMP shunt is
- Ribose-5-phosphate
- Ribulose-5-phosphate ✔
- Xylose-5-phosphate
- Xylulose-5-phosphate
- The rate of HMP shunt reactions is
- Increased by Insulin ✔
- Increased in diabetes mellitus
- Increased by glucagons
- Increased in starvation
- Glycogenesis requires
- GTP
- CTP
- UTP ✔
- None of these
- Glycogen synthetase catalyses the formation of
- α−1, 4-Glycosidic bonds ✔
- α−1, 6-Glycosidic bonds
- Both (α−1, 4-Glycosidic bonds) and (α−1, 6-Glycosidic bonds)
- None of these
- Hepatic glycogenoloysis is increased by
- Insulin
- Glucagon ✔
- Epinephrine
- Glucocorticoids
- Glycogen phosphorylase liberates the following from glycogen
- Glucose
- Glucose-6-phosphate
- Glucose-1-phosphate ✔
- Maltose
- After the action of phosphorylase, glycogen is converted into
- Amylopectin
- dextrin ✔
- Amylose
- Maltose
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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