7101 to 7150 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 7101 to 7150
- Genetic engineering requires enzyme:
- DNA ase
- Amylase
- Lipase
- Restriction endonuclease ✔
- Which is not true about inorganic catalysts and enzymes?
- They are specific
- Inorganic catalysts require specific not needed by enzymes ✔
- They are sensitive to pH
- They speed up the rate of chemical reaction
- Key and lock hypothesis of enzyme action was given by
- Fischer ✔
- Koshland
- Buchner
- Kuhne
- An example of feedback inhibition is
- Allosteric inhibition of hexokinase by glucose6-phosphate✔
- Cyanide action on cytochrome
- Sulpha drug on folic acid synthesizer bacteria
- Reaction between succinic dehydrogenase and succinic acid
- Feedback term refers to
- Effect of substrate on rate of enzymatic reaction
- Effect of end product on rate reaction ✔
- Effect of enzyme concentration on rate of reaction
- Effect of external compound on rate of reaction
- Allosteric inhibition
- Makes active site unifit for substrate
- Controls excess formation and end product
- Both (Makes active site unifit for substrate) and (Controls excess formation and end product) ✔
- None of these
- The ratio of enzyme to substrate molecules can be as low as
- 1 : 100,000 ✔
- 1 : 500,000
- 1 : 10,000
- 1 : 1,000
- Vitamin B2 is component of coenzyme:
- Pyridoxal phosphate
- TPP
- NAD
- FMN/FAD ✔
- Km value of enzyme is substrate concentration at
- ½ Vmax
- 2 Vmax
- ½ Vmax ✔
- 4 Vmax
- Part of enzyme which combines with nonprotein part to form functional enzyme is
- Apoenzyme ✔
- Coenzyme
- Prosthetic group
- None of these
- Who got Nobel Prize in 1978 for working on enzymes?
- Koshland ✔
- Arber and Nathans
- Nass and Nass
- H.G. Khorana
- Site of enzyme synthesis in a cell is
- Ribosomes ✔
- RER
- Golgi bodies
- All of these
- Hexokinase (Glucose + ATP → Glucose-6– P + ADP) belongs to the category:
- Transferases ✔
- Lysases
- Oxidoreductases
- Isomerases
- Which enzyme is concerned with transfer of electrons?
- Desmolase
- Hydrolase
- Dehydrogenase✔
- Transaminase
- The best example of extracellular enzymes (exoenzyme) is
- Nucleases
- Digestive enzymes ✔
- Succinic dehydrogenase
- None of these
- Which mineral element controls the activity of Nitrate reductase ?
- Fe
- Mo ✔
- Zn
- Ca
- Name the enzyme that acts both as carboxylase at one time and oxygenase at another time.
- PEP carboxylase
- RuBP carboxylase✔
- Carbonic anyhdrase
- None of these
- A metabolic pathways is a
- Route taken by chemicals
- Sequence of enzyme facilitated chemical reactions ✔
- Route taken by an enzyme from one reaction to another
- Sequence of origin of organic molecules
- The energy required to start an enzymatic reaction is called
- Chemical energy
- Metabolic energy
- Activation energy ✔
- Potential energy
- Out of the total enzymes present in a cell, a mitochondrion alone has
- 4%
- 70%✔
- 95%
- 50%
- Creatine phosphokinase isoenzyme is a marker for
- Kidney disease
- Liver disease
- Myocardial infarction ✔
- None of these
- Which inactivates an enzyme by occupying its active site?
- Competitive inhibitor ✔
- Allosteric inhibitor
- Non-competitive inhibitor
- All of these
- Which one is coenzyme?
- ATP
- Vitamin B and C
- CoQ and CoA✔
- All of these
- The active site of an enzyme is formed by
- R group of amino acids ✔
- NH2 group of amino acids
- CO group of amino acids
- Sulphur bonds which are exposed
- Carbonic anhydrase enzyme has maximum turn over number (36 million). Minimum turn over number for an enzyme:
- DNA polymerase
- Lysozyme ✔
- Penicillase
- Lactase dehydrogenase
- In cell, digestive enzymes are found mainly in
- Vacuoles
- Lysosomes✔
- Ribosomes
- Lomasomes
- Substrate concentration at which an enzyme attains half its maximum velocity is
- Threshold value
- Michaelis-Menton constant✔
- Concentration level
- None of these
- Which enzyme hydrolyses starch?
- Invertase
- Maltase
- Sucrase
- Diastase✔
- Enzymes functional in cell or mitochondria are
- Endoenzymes ✔
- Exoenzymes
- Apoenzymes
- Holoenzymes
- The enzymes present in the membrane of mitochondria are
- Flavoproteins and cytochromes ✔
- Fumarase and lipase
- Enolase and catalase
- Hexokinase and zymase
- A mitochondrial marker enzyme is
- Aldolase
- Amylase
- Succinic dehydrogenase ✔
- Pyruvate dehydrogenase
- The enzyme used in polymerase chain reaction (PCR) is
- Taq polymerase ✔
- RNA polymerase
- Ribonuclease
- Endonuclease
- Which of the following is a microsomal enzyme inducer?
- Indomethacin
- Clofibrate ✔
- Tolbutamide
- Glutethamide
- Identify the correct molecule which controls the biosynthesis of proteins in living organisms.
- DNA ✔
- RNA
- Purines
- Pyrimidines
- The tear secretion contains an antibacterial enzyme known as
- Zymase
- Diastase
- Lysozyme ✔
- Lipase
- Group transferring Co-enzyme is
- CoA ✔
- NAD+
- NADP+
- FAD+
- The co-enzyme containing an automatic hetero ring in the structure is
- Biotin✔
- TPP
- Sugar Phosphate
- Co-enzyme
- The example of hydrogen transferring Co-enzyme is:
- B6-PO4
- NADP+ ✔
- TPP
- ATP
- Enzyme catalyzed hydrolysis of proteins produces amino acid of the form
- D
- DL
- L ✔
- Racemic
- Transaminase activity needs the Coenzyme:
- ATP
- B6-PO4 ✔
- FADT
- NAD+
- The biosynthesis of urea occurs mainly in the liver:
- Cytosol
- Mitochondria ✔
- Microsomes
- Nuclei
- Bile salts make emulsification with fat for the action of
- Amylose
- Lipase ✔
- Pepsin
- Trypsin
- All of the following compounds are intermediates of TCA cycle except
- Maleate
- Pyruvate ✔
- Oxaloacetate
- Fumarate
- In conversion of lactic acid to glucose, three reactions of glycolytic pathway are circumvented, which of the following enzymes do not participate?
- Pyruvate carboxylase
- Phosphoenol pyruvate carboxy kinase
- Pyruvate kinase ✔
- Glucose-6-phosphatase
- In the normal resting state of human most of the blood glucose burnt as fuel is consumed by
- Liver
- Brain ✔
- Adipose tissue
- Muscles
- A regulator of the enzyme glucogen synthase is
- Citric Acid
- Pyruvate
- Glucose-6-PO4 ✔
- GTP
- A specific inhibitor for succinate dehydrogenase is
- Arsenite
- Malonate ✔
- Citrate
- Fluoride
- When ATP forms AMP
- Inorganic pyrophosphate is produced ✔
- Inorganic phosphorous is produced
- Phsophagen is produced
- No energy is produced
- Standard free energy (∆G°) of hydrolysis of ATP to ADP + Pi is
- –49.3 KJ/mol
- –4.93 KJ/mol
- –30.5 KJ/mol ✔
- –20.9 KJ/mol
- Standard free energy (∆G°) of hydrolysis of ADP to AMP + Pi is
- –43.3 KJ/mol
- –30.5 KJ/mol
- –27.6 KJ/mol ✔
- –15.9 KJ/mo
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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