7051 to 7100 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.
If You like then share this to your friends and other social media.
If You have any question and suggestions then please Contact us Here
Questions 7051 to 7100
- Which of the following is not true regarding enzymes?
- They catalyze only a particular type of reaction
- They remain active even after separation from the source
- They are destroyed after the completion of the reaction they catalyse ✔
- They are irreversibly destroyed at high temperature
- Their activity depends on the pH of the solution
- Enzymes activity is controlled by
- pH of the solution
- Temperature
- Concentration of the enzyme
- Concentration of the substrate
- All of these ✔
- Which of the following is not true regarding enzymes?
- They catalyze only a particular type of reaction
- They remain active even after separation from the source
- They are destroyed after the completion of the reaction they catalyse ✔
- They are irreversibly destroyed at high temperature
- Their activity depends on the pH of the solution
- Nicotine present in tobacco is a/an
- Alkaloid ✔
- Terpene
- Steroid
- Protein
- The poisonous alkaloid present in the oil of hemlock is
- Cocaine ✔
- Nicotine
- Quinine
- Morphine
- Alkaloids are usually purified by extraction with
- Ether
- Dil HCl
- NaOH
- Chloroform ✔
- The number of N-MC groups in alkaloids is best estimate with the help of
- HI 11
- H2SO4
- (CH3CO)2 CO ✔
- CH3 Mg I
- A competitive inhibitor of an enzyme
- Increases Km without affecting Vmax ✔
- Decreases Km without affecting Vmax
- Increases Vmax without affecting Km
- Decreases both Vmax and Km
- The Michaelis constant, Km is
- Numerically equal to ½ Vmax
- Dependent on the enzyme concentration
- Independent of pH
- Numerically equal to the substrate concentration that gives half maximal velocity ✔
- The rate of an enzyme catalyzed reaction was measured using several substrate concentrations that were much lower than Km, the dependence of reaction velocity on substrate concentration can best be described as
- Independent of enzyme concentration
- A constant fraction of Vmax
- Equal to Km
- Proportional to the substrate concentration ✔
- The presence of a non competitive inhibitor
- Leads to both an increase in the Vmax of a reaction and an increase in Km
- Leads to a decrease in the observed Vmax ✔
- Leads to a decrease in Km and Vmax
- Leads to an increase in Km without affecting Vmax
- Which one of the following statements is not characteristic of allosteric enzymes?
- They frequently catalyze a committed step early in a metabolic pathway
- They are often composed of subunits
- They follow Michaelis-Menten kinetics ✔
- They frequently show cooperativity for substrate binding
- LDH assays are most useful in diagnosing diseases of the
- Heart ✔
- Pancreas
- Brain
- Kidney
- All the isoenzymes function with the coenzyme:
- NADP+
- FAD
- Lipoate
- NAD+✔
- ‘Lock’ and ‘Key’ theory was proposed by
- Sorenson
- Fischer ✔
- Mehler
- Sanger
- Which of the following forms part of a coenzyme?
- Zn2+
- Lipase
- Vitamin B2 ✔
- Lysine
- The shape of an enzyme and consequently its activity can be reversibly altered from moment to moment by
- Heat
- Amino acid substrate
- Allosteric subunits ✔
- Sulfur substitutions
- Which one of the following regulatory actions involves a reversible covalent modification of the enzyme?
- Phosphorylation of ser-OH on the enzyme ✔
- Allosteric modulation
- Competitive inhibition
- Non-competitive inhibition
- An enzyme promotes a chemical reaction by
- Lowering the energy of activation ✔
- Causing the release of heat which acts as a primer
- Increasing molecular motion
- Changing the free energy difference between substrate and product
- In most metabolic pathways, all needed enzymes are arranged together in a multienzyme complex within a
- Solution of ATP
- Membrane ✔
- Quanternary protein
- Coenzyme
- An enzyme catalyzes the conversion of an aldose sugar to a ketose sugar would be classified as one of the
- Transferases
- Isomerases ✔
- Oxido reductases
- Hydrolases
- The function of an enzyme is to
- Cause chemical reactions that would not otherwise take place
- Change the rates of chemical reactions✔
- Control the equilibrium points of reactions
- Change the directions of reactions
- In which of the following types of enzymes, water may be added to a C—C double bond without breaking the bond?
- Hydrolase
- Hydratase ✔
- Hydroxylase
- Oxygenase
- Enzymes increases the rate of reactions by
- Increasing the free energy of activation
- Decreasing the energy of activation ✔
- Changing the equilibrium constant of the reaction
- Increasing the free energy change of the reaction
- The active site of an enzyme is formed by a few of the enzymes:
- R groups of the amino acids ✔
- Amino groups of the amino acids
- Carboxyl group of the amino acids
- Exposed sulfur bonds
- Allosteric enzymes contain
- Multiple subunits ✔
- Single chain
- Two chains
- Three chains
- Isoenzymes of lactate dehydrogenase are useful for the diagnosis of
- Heart disease ✔
- Kidney disease
- Liver disease
- Both (Heart disease ) and (Kidney disease)
- IUB had divided enzymes into how many classes?
- 6 ✔
- 5
- 8
- 4
- The first enzyme isolated, purified and crystallied from Jack bean (Canavalia) by summer in 1926 was
- Urease ✔
- Insulin
- Ribonuclease
- Zymase
- Who suggested that enzymes are proteinaceous?
- Buchner
- Kuhne
- Sumner ✔
- Pasteur
- Feedback inhibition of enzyme action is affected by
- Enzyme
- Substrate
- End products ✔
- None of these
- The enzyme that converts glucose to glucose-6-phosphate is
- Phosphatase
- Hexokinase ✔
- Phosphorylase
- Glucose synthetase
- Enzymes are required in traces because they
- Have high turnover number
- Remain unused at the end of reaction and are re used
- Show cascade effect
- All correct ✔
- An organic substance bound to an enzyme and essential for the activity of enzyme is called
- Holoenzyme
- Apoenzyme
- Coenzyme ✔
- Isoenzyme
- Enzyme catalysed reactions occur in
- Pico seconds
- seconds
- Milli seconds ✔
- None of these
- An enzyme can accelerate a reaction up to
- 1010 times ✔
- 101 times
- 10100 times
- 10 times
- In plants, enzymes occur in
- Flowers only
- Leaves only
- All living cells ✔
- Storage organs only
- Zymogen is a
- Vitamin
- Enzyme precursor✔
- Modulator
- Hormone
- Cofactor (Prosthetic group) is a part of holoenzyme, it is
- Inorganic part loosely attached
- Accessory non-protein substance attached firmly ✔
- Organic part attached loosely
- None of these
- A protein having both structural and enzymatic traits is
- Myosin ✔
- Collagen
- Trypsin
- Actin
- Enzymes are different from catalysts in
- Being proteinaceous✔
- Not used up in reaction
- Functional at high temperature
- Having high rate of diffusion
- Enzymes, vitamins and hormones are common in
- Being proteinaceous
- Being synthesized in the body of organisms
- Enhancing oxidative metabolism
- Regulating metabolism ✔
- Dry seeds endure higher temperature than germinating seeds as
- Hydration is essential for making enzymes sensitive to temperature ✔
- Dry seeds have a hard covering
- Dry seeds have more reserve food
- Seedlings are tender
- Coenzymes FMN and FAD are derived from vitamin
- C
- B6
- B1
- B2 ✔
- Template/lock and key theory of enzyme action is supported by
- Enzymes speed up reaction
- Enzymes occur in living beings and speed up certain reactions
- Enzymes determine the direction of reaction
- Compounds similar to substrate inhibit enzyme activity ✔
- Combination of apoenzyme and coenzyme produces
- Prosthetic group
- Holoenzyme ✔
- Enzyme substrate complex
- Enzyme product complex
- Enzyme inhibition caused by a substance resembling substrate molecule is
- Competitive inhibition ✔
- Non-competitive inhibition
- Feedback inhibition
- Allosteric inhibition
- An enzyme brings about
- Decrease in reaction time
- Increase in reaction time
- Increase in activation energy
- Reduction in activation energy✔
- Feedback inhibition of enzyme is influenced by
- Enzyme
- External factors
- End product ✔
- Substrate
- Coenzyme is
- Often a vitamin ✔
- Always an inorganic compound
- Always a protein
- Often a metal
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.
Possible References Used
