6851 to 6900 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 6851 to 6900
- Albinism is due to deficiency of the enzyme:
- Phenylalanine hydroxylase
- Tyrosinase ✔
- p-Hydroxyphenylpyruvic acid oxidase
- Tyrosine dehydrogenase
- Neonatal tyrosinemia is due to deficiency of the enzyme:
- p-Hydroxyphenylpyruvate hydroxylase
- Fumarylacetoacetate hydrolase ✔
- Phenylalanine hydroxylase
- Tyrosine dehydrogenase
- Which of the following is a substratespecific enzyme?
- Hexokinase
- Thiokinase
- Lactase ✔
- Aminopeptidase
- Coenzymes combine with
- Proenzymes
- Apoenzymes ✔
- Holoenzymes
- Antienzymes
- Coenzymes are required in which of the following reactions?
- Oxidation-reduction
- Transamination
- Phosphorylation
- All of these ✔
- Which of the following coenzyme takes part in hydrogen transfer reactions?
- Tetrahydrofolate
- Coenzyme A
- Coenzyme Q ✔
- Biotin
- Which of the following coenzyme takes part in oxidation-reduction reactions?
- Pyridoxal phosphate
- Lipoic acid ✔
- Thiamin diphosphate
- None of these
- In conversion of glucose to glucose-6- phsophate, the coenzyme is
- Mg++
- ATP
- Both (Mg++) and (ATP) ✔
- None of these
- A coenzyme required in transamination reactions is
- Coenzyme A
- Coenzyme Q
- Biotin
- Pyridoxal phosphate ✔
- Coenzyme A contains a vitamin which is
- Thiamin
- Ascorbic acid
- Pantothenic acid ✔
- Niacinamide
- Cobamides contain a vitamin which is
- Folic acid
- Ascorbic acid
- Pantothenic acid
- Vitamin B12 ✔
- A coenzyme required in carboxylation reactions is
- Lipoic acid
- Coenzyme A
- Biotin ✔
- All of these
- Which of the following coenzyme takes part in tissue respiration?
- Coenzyme Q ✔
- Coenzyme A
- NADP
- Cobamide
- The enzyme hexokinase is a
- Hydrolase
- Oxidoreductase
- Transferase ✔
- Ligase
- Which of the following is a proteolytic enzyme?
- Pepsin
- Trypsin
- Chymotrypsin
- All of these ✔
- Enzymes which catalyse binding of two substrates by covalent bonds are known as
- Lyases
- Hydrolases
- Ligases ✔
- Oxidoreductases
- The induced fit model of enzyme action was proposed by
- Fischer
- Koshland ✔
- Mitchell
- Markert
- Allosteric inhibition is also known as
- Competitive inhibition
- Non-competitive inhibition
- Feedback inhibition ✔
- None of these
- An allosteric enzyme is generally inhibited by
- Initial substrate of the pathway
- Substrate analogues
- Product of the reaction catalysed by allosteric enzyme
- Product of the pathway ✔
- When the velocity of an enzymatic reaction equals Vmax, substrate concentration is
- Half of Km
- Equal to Km
- Twice the Km
- Far above the Km ✔
- In Lineweaver-Burk plot, the y-intercept represents
- Vmax
- Km
- Km
- 1/Km ✔
- In competitive inhibition, the inhibitor
- Competes with the enzyme
- Irreversibly binds with the enzyme
- Binds with the substrate
- Competes with the substrate ✔
- Competitive inhibitors
- Decrease the Km
- Decrease the Vmax
- Increase the Km ✔
- Increase the Vmax
- Competitive inhibition can be relieved by raising the
- Enzyme concentration
- Substrate concentration ✔
- Inhibitor concentration
- None of these
- Physostigmine is a competitive inhibitor of
- Xanthine oxidase
- Cholinesterase ✔
- Carbonic anhydrase
- Monoamine oxidase
- Carbonic anhydrase is competitively inhibited by
- Allopurinol
- Acetazolamide ✔
- Aminopterin
- Neostigmine
- Serum lactate dehydrogenase rises in
- Viral hepatitis
- Myocardial infarction
- Carcinomatosis
- All of these ✔
- Which of the following serum enzyme rises in myocardial infarction:
- Creatine kinase
- GOT
- LDH
- All of these ✔
- From the following myocardial infarction, the earliest serum enzyme to rise is
- Creatine Kinase ✔
- GOT
- GPT
- LDH
- Proenzymes:
- Chymotrysinogen
- Pepsinogen
- Both (Chymotrysinogen) and (Pepsinogen) ✔
- None of these
- Alkaline phosphatase is present in
- Liver
- Bones
- Placenta
- All of these ✔
- Which of the following isoenzyme of lactate dehydrogenase is raised in serum in myocardial infarction:
- LD1 ✔
- LD2
- LD1 and LD2
- LD5
- Enzymes which are always present in an organism are known as
- Inducible enzymes
- Constitutive enzymes✔
- Functional enzymes
- Apoenzymes
- Inactive precursors of enzymes are known as
- Apoenzymes
- Coenzymes
- Proenzymes ✔
- Holoenzymes
- Whcih of the following is a proenzyme?
- Carboxypeptidase
- Aminopeptidase
- Chymotrypsin
- Pepsinogen✔
- Allosteric enzymes regulate the formation of products by
- Feedback inhibition ✔
- Non-competitive inhibition
- Competitive inhibition
- Repression-derepression
- Regulation of some enzymes by covalent modification involves addition or removal of
- Acetate
- Sulphate
- Phosphate ✔
- Coenzyme
- Covalent modification of an enzyme generally requires a
- Hormone
- cAMP
- Protein kinase
- All of these ✔
- An inorganic ion required for the activity of an enzyme is known as
- Activator
- Cofactor ✔
- Coenzyme
- None of these
- The first enzyme found to have isoenzymes was
- Alkaline Phosphatase
- Lactate dehydrogenase ✔
- Acid Phosphatase
- Creatine kinase
- Lactate dehydrogenase is located in
- Lysosomes
- Mitochondria
- Cytosol ✔
- Microsomes
- Lactate dehydrogenase is a
- Monomer
- Dimer
- Tetramer ✔
- Hexamer
- Ceruloplasmin is absent in
- Cirrhosis of liver
- Wilson’s disease ✔
- Menke’s disease
- Copper deficiency
- Ceruloplasmin oxidizes
- Copper
- Iron ✔
- Both (Copper ) and (Iron)
- None of these
- Creatine kinase is present in all of the following except
- Liver ✔
- Myocardium
- Muscles
- Brain
- Alkaline phosphatase is present in
- Liver
- Bones
- Intestinal mucosa
- All of these ✔
- All of the following are zinc-containing enzymes except
- Acid Phosphatase ✔
- Alkaline Phosphatase
- Carbonic anhydrase
- RNA polymerase
- All of the following are iron-containing enzymes except
- Carbonic anhydrase ✔
- Catalase
- Peroxidase
- Cytochrome oxidase
- Biotin is a coenzyme for
- Pyruvate dehydrogenase
- Pyruvate carboxylase ✔
- PEP carboxykinase
- Glutamate pyruvate transminase
- Enzymes accelerate the rate of reactions by
- Increasing the equilibrium constant of reactions
- Increasing the energy of activation
- Decreasing the energy of activation ✔
- Decreasing the free energy change of the reaction
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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